TEA1750T/N1,518 - NXP Semiconductors / Philips Semiconductors

1. General description

The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS)

controller ICs. The TEA1750 combines a controller for Power Factor Correction (PFC) and

a ﬂyback controller. Its high level of integration allows the design of a cost-effective power

supply with a very low number of external components.

The special built-in green functions provide high efﬁciency at all power levels. This applies

to quasi-resonant operation at high power levels, quasi-resonant operation with valley

skipping, as well as to reduced frequency operation at lower power levels. At low power

levels, the PFC switches over to burst mode control to maintain high efﬁciency. In burst

mode, soft-start and soft-stop functions are added to eliminate audible noise.

During low power conditions, the ﬂyback controller switches to frequency reduction mode

and limits the peak current to 25 % of its maximum value. This will ensure high efﬁciency

at low power and good standby power performance while minimizing audible noise from

the transformer.

The proprietary high voltage BCD800 process makes direct start-up possible from the

rectiﬁed universal mains voltage in an effective and green way. A second low voltage

Silicon On Insulator (SOI) IC is used for accurate, high speed protection functions and

control.

The TEA1750 enables highly efﬁcient and reliable supplies with power requirements up to

250 W, to be designed easily and with the minimum number of external components.

2. Features

2.1 Distinctive features

nIntegrated PFC and ﬂyback controller

nUniversal mains supply operation (70 V AC to 276 VAC)

nHigh level of integration, resulting in a very low external component count and a

cost-effective design

2.2 Green features

nOn-chip start-up current source

2.3 PFC green features

nValley/zero voltage switching for minimum switching losses (patented)

nFrequency limitation to reduce switching losses

nBurst mode operation if a low load is detected at the ﬂyback output (patented)

TEA1750

GreenChip III SMPS control IC

Rev. 02 — 15 December 2008 Product data sheet

Product data sheet Rev. 02 — 15 December 2008 2 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

2.4 Flyback green features

nValley switching for minimum switching losses (patented)

nFrequency reduction with ﬁxed minimum peak current at low power operation to

maintain high efﬁciency at low output power levels

2.5 Protection features

nSafe restart mode for system fault conditions

nContinuous mode protection by means of demagnetization detection for both

converters (patented)

nUnderVoltage Protection (UVP) (foldback during overload)

nAccurate OverVoltage Protection (OVP) for both converters (adjustable for ﬂyback

converter)

nOpen control loop protection for both converters

nIC OverTemperature Protection (OTP)

nLow and adjustable OverCurrent Protection (OCP) trip level for both converters

nSoft (re)start for both converters

nSoft stop PFC to minimize audible noise

nMains UnderVoltage Protection (UVP)/ brownout protection

nGeneral purpose input for latched protection, e.g. to be used for system

Overtemperature protection

3. Applications

nThe device can be used in all applications that require an efﬁcient and cost-effective

power supply solution up to 250 W. Notebook adapters in particular can beneﬁt from

the high level of integration.

4. Ordering information

Table 1. Ordering information

Type number Package

Name Description Version

TEA1750T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

Product data sheet Rev. 02 — 15 December 2008 3 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

5. Block diagram

Fig 1. Block diagram

LOW VIN

TIMER 50 µs

TIMER 4 µs

PFC

PROT

VoOVP

VoBURST HIGH

VoBURST LOW

VoSTART FB

VoSHORT

LOWVIN

OCP

PFC DRIVER

ENABLE PFC

START STOP PFC

500 mV

VoBURST LOW

VoBURST HIGH

SOFT START

SOFT STOP

PFCGATE

VALLEY

DETECT

ZCS

−100 mV

BLANK

2.50 V 2.7 V

1.25 V

MAX

VCC GOOD

VoSTART FB

LOW POWER

EXT PROT

OTP

OvpFB

LATCH RESET

TON MAX

VoSHORT

TIMEOUT

VUVLO

PROT

EXT PROT

VSTART

VUVLO

SMPS

CONTROL

LATCHED

PROTECTION

SAFE

RESTART

PROTECTION

CHARGE

CONTROL

STARTFB

START STOP

PFC

PROT

VCC GOOD

CHARGE

PFC

OSC

PFC

PROT PROT

LATCH

RESET ENABLE

PFC

START

SOFT

START

DRIVER

ENABLE

BLANK

PFC

OSC

TON MAX

FREQ

RED.

EXT PROT

LOW

POWER

TIME

OUT

FB DRIVER

FB GATE

DRVDRV

12 13

PFC DRIVER

PFC GATE

VINSENSE

PFCCOMP

VOSENSE

PFCSENSE

PFCAUX OTP

CHANGE

VALLEY

DETECT

OTP

INTERNAL

SUPPLY

ZCS FB GATE

FBAUX

FBSENSE

COUNTER OVP

OvpFB

1.12 V 3.5 V

HV VCC

16 1

GND

FBCTRL

LATCH

80 mV

PFCDRIVER FBDRIVER

VSTART

VUVLO

30 µA

60 µA

3.7 V

80 µA

PROT

ENABLEFB

2.5 V 3.5 V

1.25 V

014aaa055

TEMP

Product data sheet Rev. 02 — 15 December 2008 4 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

6. Pinning information

6.1 Pinning

6.2 Pin description

Fig 2. Pin conﬁguration for TEA1750T (SOT109-1)

TEA1750T

VCC HV

GND HVS

FBCTRL HVS

FBAUX FBDRIVER

LATCH PFCDRIVER

PFCCOMP PFCSENSE

VINSENSE FBSENSE

PFCAUX VOSENSE

014aaa015

Table 2. Pin description

Symbol Pin Description

VCC 1 supply voltage

GND 2 ground

FBCTRL 3 control input for ﬂyback

FBAUX 4 input from auxiliary winding for demagnetization timing and

overvoltage protection for ﬂyback

LATCH 5 general purpose protection input

PFCCOMP 6 frequency compensation pin for PFC

VINSENSE 7 sense input for mains voltage

PFCAUX 8 input from auxiliary winding for demagnetization timing for PFC

VOSENSE 9 sense input for PFC output voltage

FBSENSE 10 programmable current sense input for ﬂyback

PFCSENSE 11 programmable current sense input for PFC

PFCDRIVER 12 gate driver output for PFC

FBDRIVER 13 gate driver output for ﬂyback

HVS 14, 15 high voltage safety spacer, not connected

HV 16 high voltage start-up and valley sensing of ﬂyback part

Product data sheet Rev. 02 — 15 December 2008 5 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7. Functional description

7.1 General control

The TEA1750 contains a controller for a power factor correction circuit as well as a

controller for a ﬂyback circuit. A typical conﬁguration is shown in Figure 3.

7.1.1 Start-up and undervoltage lock-out

Initially the capacitor on the VCC pin is charged from the high voltage mains via the HV pin.

As long as VCC is below Vtrip, the charge current is low. This protects the IC in case the

VCC pin is shorted to ground. For a short start-up time the charge current above Vtrip is

increased until VCC reaches Vth(UVLO). If VCC is between Vth(UVLO) and Vstartup, the charge

current is low again, ensuring a low duty cycle during fault conditions.

The control logic activates the internal circuitry and switches off the charge current when

the voltage on pin VCC passes the Vstartup level. First, the LATCH pin output is activated

and the soft-start capacitors on the PFCSENSE and FBSENSE pins are charged. When

the LATCH pin voltage exceeds the Ven(LATCH) voltage and the soft-start capacitor on the

PFCSENSE pin is charged, the PFC circuit is activated. The supply current from the

HV pin is then switched on again and the PFC circuit charges the Cbus capacitor. When

the voltage on pin VOSENSE reaches the Vstart(fb) level, the charge current is switched off

and the ﬂyback converter is activated (providing the soft-start capacitor on the FBSENSE

pin is charged). The output voltage of the ﬂyback converter is then regulated to its nominal

output voltage. The IC supply is taken over by the auxiliary winding of the ﬂyback

converter. See Figure 4.

Fig 3. Typical conﬁguration of TEA1750

12 11 9 16 13

TEA1750T

014aaa016

Product data sheet Rev. 02 — 15 December 2008 6 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

When the PFC is started, there is initially no supply take-over from the auxiliary winding.

To make a small VCC capacitor possible, the VCC voltage is regulated to the Vstartup level,

as long as the ﬂyback converter has not yet started. Regulation is done by hysteretic

control with a limited (high level) charge current. The hysteresis is typically 300 mV.

If during start-up the LATCH pin does not reach the Ven(LATCH) level before VCC reaches

Vth(UVLO), the LATCH pin output is de-activated and the charge current is switched on

again.

As soon as the ﬂyback converter is started, the voltage on the FBCTRL pin is monitored. If

the output voltage of the ﬂyback converter does not reach its intended regulation level in a

predeﬁned time, the voltage on the FBCTRL pin reaches the Vto(FBCTRL) level and an error

is assumed. The TEA1750 then initiates a safe restart.

When one of the protection functions is activated, both converters stop switching and the

VCC voltage drops to Vth(UVLO). A latched protection recharges the VCC capacitor via the

HV pin, but does not restart the converters. For a safe-restart protection, the capacitor is

recharged via the HV pin and the device restarts (see Figure 1)

In the event of an overvoltage protection of the PFC circuit

(VIon pin VOSENSE > Vovp(VOSENSE)), only the PFC controller stops switching until the

VOSENSE pin voltage drops below Vovp(VOSENSE) again. Also, if a mains undervoltage is

detected (VIon pin VINSENSE < Vstop(VINSENSE)), only the PFC controller stops switching

until VIon pin VINSENSE > Vstart(VINSENSE) again.

When the voltage on pin VCC drops below the undervoltage lock-out level, both controllers

stop switching and re-enter the safe restart mode. In the safe restart mode the driver

outputs are disabled and the VCC pin voltage is recharged via the HV pin.

Product data sheet Rev. 02 — 15 December 2008 7 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.1.2 Supply management

All internal reference voltages are derived from a temperature compensated and trimmed

on-chip band gap circuit. Internal reference currents are derived from a temperature

compensated and trimmed on-chip current reference circuit.

7.1.3 Latch input

Pin LATCH is a general purpose input pin, which can be used to switch off both

converters. The pin sources a current, IO(LATCH) on pin LATCH (typ 80 µA). Switching of

both converters is stopped as soon as the voltage on this pin drops below 1.25 V.

At initial start-up, switching is inhibited until the voltage on the LATCH pin is above 1.35 V

(typ). No internal ﬁltering is done on this pin. An internal Zener clamp of 2.7 V (typ)

protects this pin from excessive voltages.

Fig 4. Start-up sequence, normal operation, and re-start sequence

IHV

VCC

LATCH

PROTECTION

PFCSENSE

PFCDRIVER

FBSENSE

FBDRIVER

FBCTRL

VOSENSE

Vout

CHARGING VCC

CAPACITOR STARTING

CONVERTERS NORMAL

OPERATION PROTECTION RESTART

soft start

VINSENSE

Vstartup

Vth(UVLO)

Vtrip

Ven(LATCH)

Vto(FBCTRL)

Vstart(fb)

Vstart(VINSENSE)

014aaa060

Product data sheet Rev. 02 — 15 December 2008 8 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.1.4 Fast latch reset

In a typical application, the mains can be interrupted brieﬂy to reset the latched protection.

The PFC bus capacitor, Cbus, does not have to discharge for this latched protection to

reset.

Typically the PFC bus capacitor, Cbus, has to discharge for the VCC to drop to this reset

level. When the latched protection is set, the clamping circuit of the VINSENSE circuit is

disabled (see also Section 7.2.8). As soon as the VINSENSE voltage drops below

750 mV (typ) and then is raised to 870 mV (typ), the latched protection is reset.

The latched protection will also be reset by removing both the voltage on pin VCC and on

pin HV.

7.1.5 Overtemperature protection (OTP)

An accurate internal temperature protection is provided in the circuit. When the junction

temperature exceeds the thermal shutdown temperature, the IC only stops switching. As

long as OTP is active, the VCC capacitor is not recharged from the HV mains. The OTP

circuit is supplied from the HV pin if the VCC supply voltage is not sufﬁcient.

OTP is a latched protection. It can be reset by removing both the voltage on pin VCC and

on pin HV or by the fast latch reset function, see Section 7.1.4

7.2 Power factor correction circuit

The power factor correction circuit operates in quasi-resonant or discontinuous conduction

mode with valley switching. The next primary stroke is only started when the previous

secondary stroke has ended and the voltage across the PFC MOSFET has reached a

minimum value. The voltage on the PFCAUX pin is used to detect transformer

demagnetization and the minimum voltage across the external PFC MOSFET switch.

7.2.1 ton control

The power factor correction circuit is operated in ton control. The resulting mains harmonic

reduction of a typical application is well within the class-D requirements.

7.2.2 Valley switching and demagnetization (PFCAUX pin)

The PFC MOSFET is switched on after the transformer is demagnetized. Internal circuitry

connected to the PFCAUX pin detects the end of the secondary stroke. It also detects the

voltage across the PFC MOSFET. The next stroke is started if the voltage across the PFC

MOSFET is at its minimum in order to reduce switching losses and electromagnetic

interference (EMI) (valley switching).

If no demagnetization signal is detected on the PFCAUX pin, the controller generates a

zero current signal (ZCS), 50 µs (typ) after the last PFC gate signal.

If no valley signal is detected on the PFCAUX pin, the controller generates a valley signal

4µs (typ) after demagnetization was detected.

To protect the internal circuitry, for example during lightning events, it is advisable to add

a5kΩ series resistor to this pin. To prevent incorrect switching due to external

disturbance, the resistor should be placed close to the IC on the printed circuit board.

Product data sheet Rev. 02 — 15 December 2008 9 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

For applications with high transformer ringing frequencies (after the secondary stroke),

the PFCAUX pin should be connected via a capacitor and a resistor to the auxiliary

winding. A diode must than be placed from the ground connection to the PFCAUX pin.

7.2.3 Frequency limitation

To optimize the transformer and minimize switching losses, the switching frequency is

limited to fsw(PFC)max. If the frequency for quasi-resonant operation is above the fsw(PFC)max

limit, the system switches over to discontinuous conduction mode. Also here, the PFC

MOSFET is only switched on at a minimum voltage across the switch (valley switching).

7.2.4 Mains voltage compensation (VINSENSE pin)

The mathematical equation for the transfer function of a power factor corrector contains

the square of the mains input voltage. In a typical application this results in a low

bandwidth for low mains input voltages, while at high mains input voltages the Mains

Harmonic Reduction (MHR) requirements may be hard to meet.

To compensate for the mains input voltage inﬂuence, the TEA1750 contains a correction

circuit. Via the VINSENSE pin the average input voltage is measured and the information

is fed to an internal compensation circuit. With this compensation it is possible to keep the

regulation loop bandwidth constant over the full mains input range, yielding a fast transient

response on load steps, while still complying with class-D MHR requirements.

In a typical application, the bandwidth of the regulation loop is set by a resistor and two

capacitors on the PFCCOMP pin.

7.2.5 Soft start-up (pin PFCSENSE)

To prevent audible transformer noise at start-up or during hiccup, the transformer peak

current, IDM, is increased slowly by the soft start function. This can be achieved by

inserting RSS1 and CSS1 between pin PFCSENSE and current sense resistor, RSENSE1.

An internal current source charges the capacitor to VPFCSENSE =I

start(soft)PFC ×RSS1. The

voltage is limited to Vstart(soft)PFC.

The start level and the time constant of the increasing primary current level can be

adjusted externally by changing the values of RSS1 and CSS1.

The charging current Istart(soft)PFC ﬂows as long as the voltage on pin PFCSENSE is

below 0.5 V (typ). If the voltage on pin PFCSENSE exceeds 0.5 V, the soft start current

source starts limiting current Istart(soft)PFC. As soon as the PFC starts switching, the

Istart(soft)PFC current source is switched off; see Figure 5.

τSoftStart 3R

SS1

×CSS1

×=

Product data sheet Rev. 02 — 15 December 2008 10 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.2.6 Burst mode control

When the output power of the ﬂyback converter (see Section 7.3) is low, the ﬂyback

converter switches over to frequency reduction mode. When frequency reduction mode is

entered by the ﬂyback controller, the power factor correction circuit switches to burst mode

control.

In burst mode control, switching of the power factor correction circuit is inhibited until the

voltage on the VOSENSE pin has dropped to Vburst(L). Switching then restarts with a

soft-start to avoid audible noise (see Section 7.2.5). As soon as the voltage on the

VOSENSE pin reaches Vburst(H) the soft-stop circuit is activated, again to avoid audible

noise. During the soft-stop time the output voltage of the power factor correction circuit

overshoots, depending on the soft-start resistor and capacitor, RSS1 and CSS1, on the

PFCSENSE pin. As the Vburst(H) voltage is well below the Vreg(VOSENSE) voltage, the PFC

output voltage does not reach the normal operation output voltage of the power factor

correction circuit in a typical application due to this overshoot.

The burst mode repetition rate is deﬁned by the output power and the value of the bus

capacitor, Cbus.

During burst mode operation the PFCCOMP pin is clamped between a voltage of

2.7 V (typ) and 3.9 V (typ). The lower clamp voltage limits the maximum power that is

delivered during burst mode operation and yields a more sinusoidal input current during

the burst pulse. The upper clamp voltage ensures that the PFC can return to its normal

regulation point in a limited amount of time when returning from burst mode.

As soon as the ﬂyback converter leaves frequency reduction mode, the power factor

correction circuit restores normal operation. To prevent continuous on and off switching of

the PFC circuit, a small hysteresis is built in (50 mV (typ) on the FBCTRL pin).

Fig 5. Soft start-up and soft stop of PFC

SOFT START

SOFT STOP

CONTROL

OCP

PFCSENSE

0.5 V

Istart(soft)PFC ≤ 60 µA

RSS1

CSS1

RSENSE1

014aaa018

Product data sheet Rev. 02 — 15 December 2008 11 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.2.7 Overcurrent protection (PFCSENSE pin)

The maximum peak current is limited cycle-by-cycle by sensing the voltage across an

external sense resistor (RSENSE1) on the source of the external MOSFET. The voltage is

measured via the PFCSENSE pin.

7.2.8 Mains undervoltage lock-out / brownout protection (VINSENSE pin)

To prevent the PFC from operating at very low mains input voltages, the voltage on the

VINSENSE pin is sensed continuously. As soon as the voltage on this pin drops below the

Vstop(VINSENSE) level, switching of the PFC is stopped. If the low mains situation continues,

the PFC bus voltage eventually drops. The voltage on the VOSENSE pin then drops below

the Vstart(fb) level and the ﬂyback converter is also disabled.

The voltage on pin VINSENSE is clamped to a minimum value,

(Vstart(VINSENSE) −∆Vpu(VINSENSE)) for a fast restart as soon as the mains input voltage is

restored after a mains dropout.

7.2.9 Overvoltage protection (VOSENSE pin)

To prevent output overvoltage during load steps and mains transients, an overvoltage

protection circuit is built in.

As soon as the voltage on the VOSENSE pin exceeds the Vovp(VOSENSE) level, switching of

the power factor correction circuit is inhibited. Switching of the PFC recommences as

soon as the VOSENSE pin voltage drops below the Vovp(VOSENSE) level again.

When the resistor between pin VOSENSE and ground is open, the overvoltage protection

is also triggered.

7.2.10 PFC open loop protection (VOSENSE pin)

The power factor correction circuit does not start switching until the voltage on the

VOSENSE pin is above the Vth(ol)(VOSENSE) level. This protects the circuit from open loop

and VOSENSE short situations. As the VOSENSE pin draws a small input current,

switching is also inhibited when the pin is left open.

Fig 6. Burst mode control

Vburst(H)

Vburst(L)

soft-stopton controlsoft-start

VVOSENSE

envelop of

peak current

014aaa019

Product data sheet Rev. 02 — 15 December 2008 12 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.2.11 Driver (pin PFCDRIVER)

The driver circuit to the gate of the power MOSFET has a current sourcing capability of

typically 500 mA and a current sink capability of typically 1.2 A. This permits fast turn-on

and turn-off of the power MOSFET for efﬁcient operation.

7.3 Flyback controller

The TEA1750 includes a controller for a ﬂyback converter. The ﬂyback converter operates

in quasi-resonant or discontinuous conduction mode with valley switching. The auxiliary

winding of the ﬂyback transformer provides demagnetization detection and powers the IC

after start-up.

7.3.1 Multi mode operation

The TEA1750 ﬂyback controller can operate in multi modes; see Figure 7.

At high output power the converter switches to quasi-resonant mode. The next converter

stroke is started after demagnetization of the transformer current. In quasi-resonant mode

switching losses are minimized as the converter only switches on when the voltage across

the external MOSFET is at its minimum (valley switching, see also Section 7.3.2).

To prevent high frequency operation at lower loads, the quasi-resonant operation changes

to discontinuous mode operation with valley skipping in which the switching frequency is

limited for EMI to fsw(fb)(max) (125 kHz typ). Again, the external MOSFET is only switched

on when the voltage across the MOSFET is at its minimum.

At very low power and standby levels the frequency is controlled down by a voltage

controlled oscillator (VCO). The minimum frequency can be reduced to zero. During

frequency reduction mode, the primary peak current is kept at a minimal level of Ipkmax/4

to maintain a high efﬁciency. (Ipkmax is the maximum primary peak current set by the

sense resistor and the maximum sense voltage.) As the primary peak current is low in

frequency reduction mode operation (Ipk = Ipkmax/4), no audible noise is noticeable at

switching frequencies in the audible range. Valley switching is also active in this mode.

Fig 7. Multi mode operation ﬂyback

discontinuous

with valley

switching quasi resonant

PFC burst mode

frequency

reduction

fsw(fb)max

output power

switching frequency

014aaa025

PFC on

Product data sheet Rev. 02 — 15 December 2008 13 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

In frequency reduction mode the PFC controller is switched to burst mode operation and

the ﬂyback maximum frequency changes linearly with the control voltage on the FBCTRL

pin (see Figure 8 ). For stable on-off switching of the PFC burst mode, the FBCTRL pin

has a 50 mV (typ) hysteresis. At no load operation the switching frequency of the ﬂyback

can be reduced to (almost) zero.

7.3.2 Valley switching (HV pin)

Refer to Figure 9. A new cycle starts when the external MOSFET is activated. After the

on-time (determined by the FBSENSE voltage and the FBCTRL voltage), the MOSFET is

switched off and the secondary stroke starts. After the secondary stroke, the drain voltage

shows an oscillation with a frequency of approximately

where Lp is the primary self inductance of the ﬂyback transformer and Cd is the

capacitance on the drain node.

As soon as the internal oscillator voltage is high again and the secondary stroke has

ended, the circuit waits for the lowest drain voltage before starting a new primary stroke.

Figure 9 shows the drain voltage, valley signal, secondary stroke signal and the internal

oscillator signal.

Valley switching allows high frequency operation as capacitive switching losses are

reduced, see Equation 1. High frequency operation makes small and cost-effective

magnetics possible.

(1)

Fig 8. Frequency control of ﬂyback part

fsw(fb)max

VFBCTRL

1.5 V

discontinuous

with valley

switching quasi resonant

frequency

reduction

PFC burst mode

switching frequency

014aaa026

PFC on

2π× LpCd

×()×()

----------------------------------------------------

---CdV2

×f××=





Product data sheet Rev. 02 — 15 December 2008 14 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.3.3 Current mode control (FBSENSE pin)

Current mode control is used for the ﬂyback converter for its good line regulation.

The primary current is sensed by the FBSENSE pin across an external resistor and

compared with an internal control voltage.The internal control voltage is proportional to

the FBCTRL pin voltage.

(1) Start of new cycle at lowest drain voltage.

(2) Start of new cycle in a classical Pulse Width Modulation (PWM) system without valley detection.

Fig 9. Signals for valley switching

drain

secondary

stroke

014aaa027

secondary

ringing

primary

stroke

valley

(2) (1)

secondary

stroke

oscillator

Product data sheet Rev. 02 — 15 December 2008 15 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

The driver output is latched in the logic, preventing multiple switch-on.

7.3.4 Demagnetization (FBAUX pin)

The system is always in quasi-resonant or discontinuous conduction mode. The internal

oscillator does not start a new primary stroke until the previous secondary stroke has

ended.

Demagnetization features a cycle-by-cycle output short-circuit protection by immediately

lowering the frequency (longer off-time), thereby reducing the power level.

Demagnetization recognition is suppressed during the ﬁrst tsup(xfmr_ring) time (2 µs typ).

This suppression may be necessary at low output voltages and at start-up and in

applications where the transformer has a large leakage inductance.

If pin FBAUX is open-circuit or not connected, a fault condition is assumed and the

converter stops operating immediately. Operation restarts as soon as the fault condition is

removed.

7.3.5 Flyback control / time-out (FBCTRL pin)

The pin FBCTRL is connected to an internal voltage source of 3.5 V via an internal

resistor (typical resistance is 3 kΩ). As soon as the voltage on this pin is above 2.5 V (typ),

this connection is disabled. Above 2.5 V the pin is biased with a small current. When the

voltage on this pin rises above 4.5 V (typ), a fault is assumed and switching is inhibited.

When a small capacitor is connected to this pin, a time-out function can be created to

protect against an open control loop situation (see Figure 11 and Figure 12). The time-out

function can be disabled by connecting a resistor (100 kΩ) to ground on the FBCTRL pin.

If the pin is shorted to ground, switching of the ﬂyback controller is inhibited.

In normal operating conditions, when the converter is regulating the output voltage, the

voltage on the FBCTRL pin is between 1.4 V and 2.0 V (typical values) from minimum to

maximum output power.

Fig 10. Frequency control of ﬂyback part

Vsense(fb)max

VFBCTRL

1.5 V 2.0 V

0.52 V

flyback

frequency

reduction

PFC burst mode

FBSENSE peak voltage

014aaa028

PFC on

flyback

discontinuous

or QR

flyback

cycle skip

mode

1.4 V

0.13 V

Product data sheet Rev. 02 — 15 December 2008 16 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.3.6 Soft start-up (pin FBSENSE)

To prevent audible transformer noise during start-up, the transformer peak current, IDM is

slowly increased by the soft start function. This can be achieved by inserting a resistor

and a capacitor between pin FBSENSE and the current sense resistor.

An internal current source charges the capacitor to V = Istart(soft)(fb) xR

SS2, with a

maximum of approximately 0.5 V.

The start level and the time constant of the increasing primary current level can be

adjusted externally by changing the values of RSS2 and CSS2.

The soft start current Istart(soft)(fb) is switched on as soon as VCC reaches Vstartup. When the

voltage on the VOSENSE pin reaches the Vstart(fb) level and the voltage on pin FBSENSE

has reached 0.5 V, the ﬂyback converter starts switching.

The soft start current ﬂows as long as the voltage on pin FBSENSE is below

approximately 0.5 V. If the voltage on pin FBSENSE exceeds 0.5 V, the soft start current

source starts limiting the current. After the ﬂyback converter has started, the soft start

current source is switched off.

a. Circuit diagram

b. Timing diagram

Fig 11. Time-out protection

014aaa049

FBCTRL

2.5 V

4.5 V

30 µA

3 kΩ

3.5 V

TIMEOUT

014aaa050

4.5 V

2.5 V

VFBCTRL

output

voltage intended output

voltage not

reached within

time-out time.

intended output voltage

reached within time-out

time.

restart

τSoftStart 3R

SS2

×CSS2

×=

Product data sheet Rev. 02 — 15 December 2008 17 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.3.7 Maximum on-time

The ﬂyback controller limits the ‘on-time’ of the external MOSFET to 25 µs (typ). When the

‘on-time’ is longer than 25 µs, the IC stops switching and enters the safe restart mode.

7.3.8 Overvoltage protection (FBAUX pin)

An output overvoltage protection is implemented in the GreenChip III series. This works

for the TEA1750 by sensing the auxiliary voltage via the current ﬂowing into pin FBAUX

during the secondary stroke. The auxiliary winding voltage is a well-deﬁned replica of the

output voltage. Voltage spikes are averaged by an internal ﬁlter.

If the output voltage exceeds the OVP trip level, an internal counter starts counting

subsequent OVP events. The counter has been added to prevent incorrect OVP detection

which might occur during ElectroStatic Discharge (ESD) or lightning events. If the output

voltage exceeds the OVP trip level a few times and not again in a subsequent cycle, the

internal counter counts down at twice the speed it uses when counting up. However, when

typically 8 cycles of subsequent OVP events are detected, the IC assumes a true OVP

and the OVP circuit switches the power MOSFET off. As the protection is latched, the

converter only restarts after the internal latch is reset. In a typical application the mains

should be interrupted to reset the internal latch.

The output voltage Vovp(FBAUX) at which the OVP function trips, can be set by the

demagnetization resistor, RFBAUX :

where Nsis the number of secondary turns and Naux is the number of auxiliary turns of the

transformer. Current Iovp(FBAUX) is internally trimmed.

The value of RFBAUX can be adjusted to the turns ratio of the transformer, thus making an

accurate OVP detection possible.

Fig 12. Soft start-up of ﬂyback

014aaa020

SOFT START

CONTROL

OCP

FBSENSE

0.5 V

Istart(soft)fb ≤ 60 µA

RSS2

CSS2

RSENSE2

Vo ovp() Ns

Naux

------------Iovp FBAUX()

RFBAUX

×Vclamp FBAUX()

+()=

Product data sheet Rev. 02 — 15 December 2008 18 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

7.3.9 Overcurrent protection (FBSENSE pin)

The primary peak current in the transformer is measured accurately cycle-by-cycle using

the external sense resistor RSENSE2. The OCP circuit limits the voltage on pin FBSENSE

to an internal level (see also Section 7.3.3). The OCP detection is suppressed during the

leading edge blanking period, tleb, to prevent false triggering caused by switch-on spikes.

7.3.10 Driver (pin FBDRIVER)

The driver circuit to the gate of the external power MOSFET has a current sourcing

capability of typically 500 mA and a current sink capability of typically 1.2 A. This permits

fast turn-on and turn-off of the power MOSFET for efﬁcient operation.

8. Limiting values

Fig 13. OCP leading edge blanking

LEB (tleb)

OCP LEVEL

VFBSENSE

014aaa022

Table 3. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol Parameter Conditions Min Max Unit

Voltages

VCC supply voltage −0.4 +38 V

VLATCH voltage on pin LATCH current limited −0.4 +5 V

VFBCTRL voltage on pin FBCTRL −0.4 +5 V

VPFCCOMP voltage on pin PFCCOMP −0.4 +5 V

VVINSENSE voltage on pin VINSENSE −0.4 +5 V

VVOSENSE voltage on pin VOSENSE −0.4 +5 V

VPFCAUX voltage on pin PFCAUX −25 +25 V

VFBSENSE voltage on pin FBSENSE current limited −0.4 +5 V

VPFCSENSE voltage on pin PFCSENSE current limited −0.4 +5 V

VHV voltage on pin HV −0.4 +650 V

Currents

IFBCTRL current on pin FBCTRL −30 mA

IFBAUX current on pin FBAUX −1+1mA

IPFCSENSE current on pin PFCSENSE −1 +10 mA

IFBSENSE current on pin FBSENSE −1 +10 mA

IFBDRIVER current on pin FBDRIVER duty cycle < 10 % −0.8 +2 A

IPFCDRIVER current on pin PFCDRIVER duty cycle < 10 % −0.8 +2 A

IHV current on pin HV - 5 mA

Product data sheet Rev. 02 — 15 December 2008 19 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

[1] Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.

[2] Equivalent to discharging a 200 pF capacitor through a 0.75 µH coil and a 10 Ω resistor.

9. Thermal characteristics

10. Characteristics

General

Ptot total power dissipation Tamb <75°C - 0.6 W

Tstg storage temperature −55 +150 °C

Tjjunction temperature −40 +150 °C

ESD

VESD electrostatic discharge

voltage class 1

human body model pins 1 to 13 [1] - 2000 V

pin 16 (HV) [1] - 1500 V

machine model [2] - 200 V

charged device model - 500 V

Table 3. Limiting values

…continued

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol Parameter Conditions Min Max Unit

Table 4. Thermal characteristics

Symbol Parameter Conditions Typ Unit

Rth(j-a) thermal resistance from

junction to ambient in free air; JEDEC test board 124 K/W

Table 5. Characteristics

amb

=25

C; V

= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when ﬂowing into

the IC; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Start-up current source (pin HV)

IHV current on pin HV VHV >80V;

VCC <V

trip;

Vth(UVLO) <V

CC <V

startup

-1-mA

Vtrip <V

CC <V

th(UVLO) - 5.4 - mA

with auxiliary supply 8 20 40 µA

VBR breakdown voltage 650 - - V

Supply voltage management (pin VCC)

Vtrip trip voltage 0.55 0.65 0.75 V

Vstartup start-up voltage 21 22 23 V

Vth(UVLO) undervoltage lockout

threshold voltage 14 15 16 V

Vstart(hys) hysteresis of start voltage during start-up phase - 300 - mV

Vhys hysteresis voltage Vstartup −Vth(UVLO) 6.3 7 7.7 V

Product data sheet Rev. 02 — 15 December 2008 20 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

Ich(low) low charging current VIon pin HV > 80 V; VCC <V

trip

or Vth(UVLO) <V

CC <V

startup

−1.2 −1−0.8 mA

Ich(high) high charging current VIon pin HV > 80 V;

Vtrip <V

CC <V

th(UVLO)

−6.3 −5.4 −4.6 mA

ICC(oper) operating supply current no load on pin FBDRIVER and

PFCDRIVER 2.25 3 3.75 mA

Input voltage sensing PFC (pin VINSENSE)

Vstop(VINSENSE) stop voltage on pin

VINSENSE 0.86 0.89 0.92 V

Vstart(VINSENSE) start voltage on pin

VINSENSE 1.11 1.15 1.19 V

∆Vpu(VINSENSE) pull-up voltage difference on

pin VINSENSE active after Vstop(VINSENSE) is

detected -−100 - mV

Ipu(VINSENSE) pull-up current on pin

VINSENSE active after Vstop(VINSENSE) is

detected −55 −47 −40 µA

Vmvc(VINSENSE)max maximum mains voltage

compensation voltage on pin

VINSENSE

4.0 - - V

Vﬂr fast latch reset voltage active after Vth(UVLO) is detected - 0.75 - V

Vﬂr(hys) hysteresis of fast latch reset

voltage - 0.12 - V

II(VINSENSE) input current on pin

VINSENSE VVINSENSE >V

stop(VINSENSE) after

Vstart(VINSENSE) is detected 5 33 100 nA

Loop compensation PFC(pin PFCCOMP)

gmtransconductance VVOSENSE to IO(PFCCOMP) 60 80 100 µA/V

IO(PFCCOMP) output current on pin

PFCCOMP VVOSENSE =3.3V 333945µA

VVOSENSE = 2.0 V −45 −39 −33 µA

Vclamp(PFCCOMP) clamp voltage on pin

PFCCOMP low power mode, PFC in burst

mode, lower clamp voltage [1] 2.5 2.7 2.9 V

upper clamp voltage [1] - 3.9 - V

Vton(PFCCOMP)zero zero on-time voltage on pin

PFCCOMP 3.4 3.5 3.6 V

Vton(PFCCOMP)max maximum on-time voltage on

pin PFCCOMP 1.20 1.25 1.30 V

Pulse width modulator PFC

ton(PFC) PFC on-time VVINSENSE = 3.3 V;

VPFCCOMP =V

ton(max)(PFC)

3.6 4.5 5.0 µs

VVINSENSE = 0.9 V;

VPFCCOMP =V

ton(max)(PFC)

30 40 53 µs

Table 5. Characteristics

…continued

amb

=25

C; V

= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when ﬂowing into

the IC; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Product data sheet Rev. 02 — 15 December 2008 21 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

Output voltage sensing PFC (pin VOSENSE)

Vth(ol)(VOSENSE) open-loop threshold voltage

on pin VOSENSE 0.35 0.40 0.45 V

Vstart(fb) ﬂyback start voltage [2] - 1.72 - V

Vstop(fb) ﬂyback stop voltage 1.55 1.60 1.65 V

Vburst(L) LOW-level burst mode voltage 1.87 1.92 1.97 V

Vburst(H) HIGH-level burst mode voltage 2.19 2.24 2.29 V

Vreg(VOSENSE) regulation voltage on pin

VOSENSE IO(PFCCOMP) = 0 2.475 2.500 2.525 V

Vovp(VOSENSE) overvoltage protection voltage

on pin VOSENSE 2.60 2.63 2.67 V

II(VOSENSE) input current on pin

VOSENSE VVOSENSE = 2.5 V 5 45 100 nA

Overcurrent protection PFC (pin PFCSENSE)

Vsense(PFC)max maximum PFC sense voltage ∆V/∆t = 50 mV/µs 0.49 0.52 0.55 V

∆V/∆t = 200 mV/µs 0.51 0.54 0.57 V

tleb(PFC) PFC leading edge blanking

time 250 310 370 ns

Iprot(PFCSENSE) protection current on pin

PFCSENSE −50 - −5nA

Soft start, soft stop PFC (pin PFCSENSE)

Istart(soft)PFC PFC soft start current −75 −60 −45 µA

Vstart(soft)PFC PFC soft start voltage 0.46 0.50 0.54 V

Vstop(soft)PFC PFC soft stop voltage 0.42 0.45 0.48 V

Rstart(soft)PFC PFC soft start resistance 12 - - kΩ

Oscillator PFC

fsw(PFC)max maximum PFC switching

frequency 100 125 150 kHz

toff(PFC)min minimum PFC off-time 1.1 1.4 1.7 µs

Valley switching PFC (pin PFCAUX)

(∆V/∆t)vrec(PFC) PFC valley recognition voltage

change with time - - 1.7 V/µs

tvrec(PFC) PFC valley recognition time VPFCAUX = 1 V; peak-to-peak [3] - - 300 ns

demagnetization to ∆V/∆t = 0 [4] --50ns

tto(vrec)PFC PFC valley recognition

time-out time 346µs

Table 5. Characteristics

…continued

amb

=25

C; V

= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when ﬂowing into

the IC; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Product data sheet Rev. 02 — 15 December 2008 22 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

Demagnetization management PFC (pin PFCAUX)

Vth(comp)PFCAUX comparator threshold voltage

on pin PFCAUX −150 −100 −50 mV

tto(demag)PFC PFCdemagnetizationtime-out

time 40 50 60 µs

Iprot(PFCAUX) protection current on pin

PFCAUX VPFCAUX =50mV −75 - −5nA

Driver (pin PFCDRIVER)

Isrc(PFCDRIVER) source current on pin

PFCDRIVER VPFCDRIVER =2V - −0.5 - A

Isink(PFCDRIVER) sink current on pin

PFCDRIVER VPFCDRIVER = 2 V - 0.7 - A

VPFCDRIVER =10V - 1.2 - A

VO(PFCDRIVER)max maximum output voltage on

pin PFCDRIVER - 1112V

Overvoltage protection ﬂyback (pin FBAUX)

Iovp(FBAUX) overvoltage protection current

on pin FBAUX 279 300 321 µA

Ncy(ovp) number of overvoltage

protection cycles 6812

Demagnetization management ﬂyback (pin FBAUX)

Vth(comp)FBAUX comparator threshold voltage

on pin FBAUX 60 80 110 mV

Iprot(FBAUX) protection current on pin

FBAUX VFBAUX =50mV −50 - −5nA

Vclamp(FBAUX) clamp voltage on pin FBAUX IFBAUX =−500 µA−1.0 −0.8 −0.6 V

IFBAUX = 500 µA 0.5 0.7 0.9 V

tsup(xfmr_ring) transformer ringing

suppression time 1.5 2 2.5 µs

Pulse width modulator ﬂyback

ton(fb)min minimum ﬂyback on-time - tleb(fb) -ns

ton(fb)max maximum ﬂyback on-time 20 25 30 µs

Oscillator ﬂyback

fsw(fb)max maximum ﬂyback switching

frequency 100 125 150 kHz

Vstart(VCO)FBCTRL VCO start voltage on pin

FBCTRL 1.3 1.5 1.7 V

Vhys(FBCTRL) hysteresis voltage on pin

FBCTRL -60-mV

∆VVCO(FBCTRL) VCO voltage difference on pin

FBCTRL -−0.1 - V

Table 5. Characteristics

…continued

amb

=25

C; V

= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when ﬂowing into

the IC; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Product data sheet Rev. 02 — 15 December 2008 23 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

Peak current control ﬂyback (pin FBCTRL)

VFBCTRL voltage on pin FBCTRL for maximum ﬂyback peak

current 1.85 2.0 2.15 V

Vto(FBCTRL) time-out voltage on pin

FBCTRL enable voltage - 2.5 - V

trip voltage 4.2 4.5 4.8 V

Rint(FBCTRL) internal resistance on pin

FBCTRL -3-kΩ

IO(FBCTRL) output current on pin FBCTRL VFBCTRL =0V −1.4 −1.17 −0.93 mA

VFBCTRL =2V −0.6 −0.5 −0.4 mA

Ito(FBCTRL) time-out current on pin

FBCTRL VFBCTRL = 2.6 V −36 −30 −24 µA

VFBCTRL = 4.1 V −34.5 −28.5 −22.5 µA

Valley switching ﬂyback (pin HV)

(∆V/∆t)vrec(fb) ﬂyback valley recognition

voltage change with time −75 - +75 V/µs

td(vrec-swon) valley recognition to switch-on

delay time [5] - 150 - ns

Soft start ﬂyback (pin FBSENSE)

Istart(soft)fb ﬂyback soft start current −75 −60 −45 µA

Vstart(soft)fb ﬂyback soft start voltage 0.43 0.49 0.54 V

Rstart(soft)fb ﬂyback soft start resistance 12 - - kΩ

Overcurrent protection ﬂyback (pin FBSENSE)

Vsense(fb)max maximum ﬂyback sense

voltage ∆V/∆t = 50 mV/µs 0.49 0.52 0.55 V

∆V/∆t = 200 mV/µs 0.52 0.55 0.58 V

tleb(fb) ﬂyback leading edge blanking

time 255 305 355 ns

Driver (pin FBDRIVER)

Isrc(FBDRIVER) source current on pin

FBDRIVER VFBDRIVER =2V - −0.5 - A

Isink(FBDRIVER) sink current on pin FBDRIVER VFBDRIVER = 2 V - 0.7 - A

VFBDRIVER =10V - 1.2 - A

VO(FBDRIVER)(max) maximum output voltage on

pin FBDRIVER - 1112V

Latch input (pin LATCH)

Vprot(LATCH) protection voltage on pin

LATCH 1.23 1.25 1.27 V

IO(LATCH) output current on pin LATCH Vprot(LATCH) <V

LATCH <V

oc(LATCH) −85 −80 −75 µA

Ven(LATCH) enable voltage on pin LATCH at start-up 1.30 1.35 1.40 V

Vhys(LATCH) hysteresis voltage on pin

LATCH Ven(LATCH) −Vprot(LATCH) 80 100 140 mV

Voc(LATCH) open-circuit voltage on pin

LATCH - 2.9 - V

Table 5. Characteristics

…continued

amb

=25

C; V

= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when ﬂowing into

the IC; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Product data sheet Rev. 02 — 15 December 2008 24 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

[1] For a typical application with a compensation network on pin PFCCOMP, like the example in Figure 3.

[2] Typically 120 mV above Vstop(fb).

[3] Minimum required voltage change time for valley recognition on pin PFCAUX.

[4] Minimum required time between demagnetization recognition and ∆V/∆t end.

[5] Guaranteed by design.

11. Application information

A power supply with the TEA1750 consists of a power factor correction circuit followed by

a ﬂyback converter. See Figure 14.

Capacitor CVCC buffers the IC supply voltage, which is powered via the high voltage

rectiﬁed mains during start-up and via the auxiliary winding of the ﬂyback converter during

operation. Sense resistors RSENSE1 and RSENSE2 convert the current through the

MOSFETs S1 and S2 into a voltage at pins PFCSENSE and FBSENSE. The values of

RSENSE1 and RSENSE2 deﬁne the maximum primary peak current in MOSFETs S1 and S2.

In the example given, the LATCH pin is connected to a Negative Temperature Coefﬁcient

(NTC) resistor. When the resistance drops below (typ), the

protection is activated.

A capacitor CTIMEOUT is connected to the FBCTRL pin. For a 120 nF capacitor, typically

after 10 ms the time-out protection is activated. RLOOP is added so that the time-out

capacitor does not interfere with the normal regulation loop.

RS1 and RS2 are added to prevent the soft-start capacitors from being charged during

normal operation due to negative voltage spikes across the sense resistors.

Resistor RAUX1 is added to protect the IC from damage during lightning events. For

applications with high transformer ringing frequencies (after the secondary stroke), the

PFCAUX pin should be connected via a capacitor and a resistor to the auxiliary winding. A

diode must than be placed from the ground connection to the PFCAUX pin.

Temperature protection

Tpl(IC) IC protection level

temperature 130 140 150 °C

Tpl(IC)hys hysteresis of IC protection

level temperature -10-°C

Table 5. Characteristics

…continued

amb

=25

C; V

= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when ﬂowing into

the IC; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Vprot LATCH()

IO LATCH()

-------------------------------- 15.6 kΩ=

Product data sheet Rev. 02 — 15 December 2008 25 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

Fig 14. Typical application diagram of TEA1750

12 11 9 16 13

TEA1750T

014aaa021

RS2 RSS2

CSS2

COUT

RAUX2

RSENSE2

CVCC

RS1

Cbus

CSS1 RSS1

RSENSE1

CTIMEOUT

RLOOP

COMPENSATION

RAUX1 S2

Product data sheet Rev. 02 — 15 December 2008 26 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

12. Package outline

Fig 15. Package outline SOT109-1 (SO16)

detail X

vMA

(A )

pin 1 index

UNIT A

max. A1A2A3bpcD

(1) E(1) (1)

ELL

pQZywv θ

REFERENCES

OUTLINE

VERSION EUROPEAN

PROJECTION ISSUE DATE

IEC JEDEC JEITA

inches

1.75 0.25

0.10 1.45

1.25 0.25 0.49

0.36 0.25

0.19 10.0

9.8 4.0

3.8 1.27 6.2

5.8 0.7

0.6 0.7

0.3 8

0.25 0.1

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Note

1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.

1.0

0.4

SOT109-1 99-12-27

03-02-19

076E07 MS-012

0.069 0.010

0.004 0.057

0.049 0.01 0.019

0.014 0.0100

0.0075 0.39

0.38 0.16

0.15 0.05

1.05

0.041

0.244

0.228 0.028

0.020 0.028

0.012

0.01

0.25

0.01 0.004

0.039

0.016

0 2.5 5 mm

scale

SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

Product data sheet Rev. 02 — 15 December 2008 27 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

13. Revision history

Table 6. Revision history

Document ID Release date Data sheet status Change notice Supersedes

TEA1750_2 20081215 Product data sheet - TEA1750_1

Modiﬁcations: Value for Tj in Table 3 has been updated

TEA1750_1 20070406 Product data sheet - -

Product data sheet Rev. 02 — 15 December 2008 28 of 29

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

14. Legal information

14.1 Data sheet status

[1] Please consult the most recently issued document before initiating or completing a design.

[2] The term ‘short data sheet’ is explained in section “Deﬁnitions”.

[3] The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status

information is available on the Internet at URL http://www.nxp.com.

14.2 Deﬁnitions

Draft — The document is a draft version only. The content is still under

internal review and subject to formal approval, which may result in

modiﬁcations or additions. NXP Semiconductors does not give any

representations or warranties as to the accuracy or completeness of

information included herein and shall have no liability for the consequences of

use of such information.

Short data sheet — A short data sheet is an extract from a full data sheet

with the same product type number(s) and title. A short data sheet is intended

for quick reference only and should not be relied upon to contain detailed and

full information. For detailed and full information see the relevant full data

sheet, which is available on request via the local NXP Semiconductors sales

ofﬁce. In case of any inconsistency or conﬂict with the short data sheet, the

full data sheet shall prevail.

14.3 Disclaimers

General — Information in this document is believed to be accurate and

reliable. However, NXP Semiconductors does not give any representations or

warranties, expressed or implied, as to the accuracy or completeness of such

information and shall have no liability for the consequences of use of such

information.

Right to make changes — NXP Semiconductors reserves the right to make

changes to information published in this document, including without

limitation speciﬁcations and product descriptions, at any time and without

notice. This document supersedes and replaces all information supplied prior

to the publication hereof.

Suitability for use — NXP Semiconductors products are not designed,

authorized or warranted to be suitable for use in medical, military, aircraft,

space or life support equipment, nor in applications where failure or

malfunction of an NXP Semiconductors product can reasonably be expected

to result in personal injury, death or severe property or environmental

damage. NXP Semiconductors accepts no liability for inclusion and/or use of

NXP Semiconductors products in such equipment or applications and

therefore such inclusion and/or use is at the customer’s own risk.

Applications — Applications that are described herein for any of these

products are for illustrative purposes only. NXP Semiconductors makes no

representation or warranty that such applications will be suitable for the

speciﬁed use without further testing or modiﬁcation.

Limiting values — Stress above one or more limiting values (as deﬁned in

the Absolute Maximum Ratings System of IEC 60134) may cause permanent

damage to the device. Limiting values are stress ratings only and operation of

the device at these or any other conditions above those given in the

Characteristics sections of this document is not implied. Exposure to limiting

values for extended periods may affect device reliability.

Terms and conditions of sale — NXP Semiconductors products are sold

subject to the general terms and conditions of commercial sale, as published

at http://www.nxp.com/proﬁle/terms, including those pertaining to warranty,

intellectual property rights infringement and limitation of liability, unless

explicitly otherwise agreed to in writing by NXP Semiconductors. In case of

any inconsistency or conﬂict between information in this document and such

terms and conditions, the latter will prevail.

No offer to sell or license — Nothing in this document may be interpreted

or construed as an offer to sell products that is open for acceptance or the

grant, conveyance or implication of any license under any copyrights, patents

or other industrial or intellectual property rights.

14.4 Trademarks

Notice: All referenced brands, product names, service names and trademarks

are the property of their respective owners.

GreenChip — is a trademark of NXP B.V.

15. Contact information

For more information, please visit: http://www.nxp.com

For sales ofﬁce addresses, please send an email to: salesaddresses@nxp.com

Document status[1][2] Product status[3] Deﬁnition

Objective [short] data sheet Development This document contains data from the objective speciﬁcation for product development.

Preliminary [short] data sheet Qualiﬁcation This document contains data from the preliminary speciﬁcation.

Product [short] data sheet Production This document contains the product speciﬁcation.

NXP Semiconductors TEA1750

GreenChip III SMPS control IC

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 15 December 2008

Document identifier: TEA1750_2

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section ‘Legal information’.

16. Contents

1 General description. . . . . . . . . . . . . . . . . . . . . . 1

2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.1 Distinctive features . . . . . . . . . . . . . . . . . . . . . . 1

2.2 Green features . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.3 PFC green features . . . . . . . . . . . . . . . . . . . . . 1

2.4 Flyback green features . . . . . . . . . . . . . . . . . . . 2

2.5 Protection features . . . . . . . . . . . . . . . . . . . . . . 2

3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

4 Ordering information. . . . . . . . . . . . . . . . . . . . . 2

5 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3

6 Pinning information. . . . . . . . . . . . . . . . . . . . . . 4

6.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

6.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4

7 Functional description . . . . . . . . . . . . . . . . . . . 5

7.1 General control. . . . . . . . . . . . . . . . . . . . . . . . . 5

7.1.1 Start-up and undervoltage lock-out . . . . . . . . . 5

7.1.2 Supply management. . . . . . . . . . . . . . . . . . . . . 7

7.1.3 Latch input . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

7.1.4 Fast latch reset . . . . . . . . . . . . . . . . . . . . . . . . . 8

7.1.5 Overtemperature protection (OTP). . . . . . . . . . 8

7.2 Power factor correction circuit. . . . . . . . . . . . . . 8

7.2.1 ton control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7.2.2 Valley switching and demagnetization

(PFCAUX pin). . . . . . . . . . . . . . . . . . . . . . . . . . 8

7.2.3 Frequency limitation . . . . . . . . . . . . . . . . . . . . . 9

7.2.4 Mains voltage compensation (VINSENSE pin). 9

7.2.5 Soft start-up (pin PFCSENSE) . . . . . . . . . . . . . 9

7.2.6 Burst mode control . . . . . . . . . . . . . . . . . . . . . 10

7.2.7 Overcurrent protection (PFCSENSE pin) . . . . 11

7.2.8 Mains undervoltage lock-out / brownout

protection (VINSENSE pin). . . . . . . . . . . . . . . 11

7.2.9 Overvoltage protection (VOSENSE pin). . . . . 11

7.2.10 PFC open loop protection (VOSENSE pin) . . 11

7.2.11 Driver (pin PFCDRIVER) . . . . . . . . . . . . . . . . 12

7.3 Flyback controller . . . . . . . . . . . . . . . . . . . . . . 12

7.3.1 Multi mode operation . . . . . . . . . . . . . . . . . . . 12

7.3.2 Valley switching (HV pin) . . . . . . . . . . . . . . . . 13

7.3.3 Current mode control (FBSENSE pin) . . . . . . 14

7.3.4 Demagnetization (FBAUX pin) . . . . . . . . . . . . 15

7.3.5 Flyback control / time-out (FBCTRL pin) . . . . 15

7.3.6 Soft start-up (pin FBSENSE) . . . . . . . . . . . . . 16

7.3.7 Maximum on-time. . . . . . . . . . . . . . . . . . . . . . 17

7.3.8 Overvoltage protection (FBAUX pin). . . . . . . . 17

7.3.9 Overcurrent protection (FBSENSE pin) . . . . . 18

7.3.10 Driver (pin FBDRIVER). . . . . . . . . . . . . . . . . . 18

8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 18

9 Thermal characteristics . . . . . . . . . . . . . . . . . 19

10 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 19

11 Application information . . . . . . . . . . . . . . . . . 24

12 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 26

13 Revision history . . . . . . . . . . . . . . . . . . . . . . . 27

14 Legal information . . . . . . . . . . . . . . . . . . . . . . 28

14.1 Data sheet status. . . . . . . . . . . . . . . . . . . . . . 28

14.2 Deﬁnitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

14.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 28

14.4 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 28

15 Contact information . . . . . . . . . . . . . . . . . . . . 28

16 Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29