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DS-LIA130-R00A.4 1
LIA130
Optically Isolated Error Amplifier
PRELIMINARY
Part # Description
LIA130 8 Pin Surface Mount
Applications
Features Description
Ordering Information
Block Diagram
• Power system for workstations
• Telecom central office supply
• Telecom bricks
• Optocoupler, precision reference and error
amplifier in single package
• 1.240V ± 1% reference
• CTR 300% to 600%
• 3,750Vrms isolation
• VDE approval 136616
• BSI approval 8661 and 8662
• UL approval E90700
• CSA approval 1113643
The LIA130 Optically Isolated Amplifier consists of
the popular IX431 precision programmable shunt
reference and an optocoupler. The optocoupler is a
gallium arsenide (GaAs) light emitting diode optically
coupled to a silicon phototransistor. The reference
voltage tolerance is 1%. The current transfer ratio
(CTR) ranges from 300% to 600%.
It is primarily intended for use as the error amplifier/
reference voltage/optocoupler function in isolated ac
to dc power supplies and dc/dc converters.
When using the LIA130, power supply designers
can reduce the component count and save space
in tightly packaged designs. The tight tolerance
reference eliminates the need for adjustments in many
applications.
The device comes in a compact 8-pin small outline
package.
1
2
3
4 5
6
7
8LED
FB
COMP
GND
NC
C
E
NC
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LIA130
R00A.4
PRELIMINARY
Absolute Maximum Ratings are stress ratings. Stresses in
excess of these ratings can cause permanent damage to
the device. Functional operation of the device at conditions
beyond those indicated in the operational sections of this
data sheet is not implied.
Parameter Conditions Symbol Min Typ Max Units
Input Characteristics @ 25°C
LED forward voltage (ILED = 5 mA, VCOMP = VFB)(Fig.1) VF- - 1.4 V
Reference voltage
(-40 to +85°C) (VCOMP = VFB, ILED = 10 mA (Fig.1) VREF
TBD 1.24 TBD V
(25°C) TBD - TBD
Deviation of VREF over temperature - See Note 1 (TA = -40 to +85°C) VREF (DEV) - 77 TBD mV
Ratio of Vref variation to the output of the
error amplifier (ILED = 10 mA, VCOMP = VREF to 10 V) (Fig.2) ∆VREF/
∆VCOMP
- 0.002 TBD mV/V
Feedback input current (ILED = 10 mA, R1 = 10 kΩ) (Fig.3) IREF - 0.09 TBD µA
Deviation of IREF over temperature - See Note 1 (TA = -40 to +85°C) IREF (DEV) - 0.028 TBD µA
Minimum drive current (VCOMP = VFB) (Fig.1) ILED (MIN) - 45 80 µA
Off-state error amplifier current (VLED = 6 V, VFB = 0) (Fig.4) I (OFF) - 0.001 0.1 µA
Error amplifier output impedance - See Note 2 (VCOMP = VFB, ILED = 0.1 mA to 15 mA, f<1 kHZ) IZOUTI - 0.22 - Ohm
Output Characteristics @ 25°C
Collector dark current (VCE = 10V) (Fig. 5) ICEO - 0.3 TBD nA
Collector-emitter voltage breakdown (IC = 1.0mA) BVCEO 20 - - V
Emitter-collector voltage breakdown (IE = 100 µA) BVECO 7 - - V
1. The deviation parameters VREF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature
coefficient of the reference input voltage, ∆VREF, is defined as:
|∆VREF| (ppm/°C) = {VREF (DEV)/VREF (TA 25°C)} X 106 / ∆TA
where ∆TA is the rated operating free-air temperature range of the device.
2. The dynamic impedance is defined as |ZOUT| = ∆VCOMP/∆ILED. When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by:
|ZOUT, TOT| = ∆V/∆I ≈ |ZOUT| X [1 + R1/R2]
3. Device is considered as a two terminal device: Pins 1, 2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are shorted together.
4. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the common mode impulse signal, Vcm, to assure that the output will remain high.
Common mode transient immunity at output low is the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse signal,Vcm, to assure that the output will remain low.
Electrical Characteristics: Relay
Parameter Symbol Ratings Units
Storage Temperature TSTG -55 to +125 °C
Operating Temperature TOPR -40 to +85 °C
Reflow Temperature Profile
Input Voltage VLED 10 V
Input DC Current ILED 20 mA
Collector-Emitter Voltage VCEO 20 V
Emitter-Collector Voltage VECO 7 V
Collector Current IC50 mA
Input Power Dissipation (note 1) PD1 145 mW
Transistor Power Dissipation (note 2) PD2 85 mW
Total Power Dissipation (note 3) PD3 145 mW
Absolute Maximum Ratings (@ 25˚ C)
1 Derate linearly from 25°C at a rate of 2.42 mW/ °C.
2 Derate linearly from 25°C at a rate of 1.42 mW/ °C.
3 Derate linearly from 25°C at a rate of 2.42 mW/ °C.
4 Functional operation under these conditions is not implied. Permanent damage may occur if the
device is subjected to conditions outside these ratings.
LIA130
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R00A.4
PRELIMINARY
Parameter Conditions Symbol Min Typ Max Units
Transfer Characteristics @ 25°C
Current transfer ratio (ILED = 5 mA, VCOMP = VFB, VCE = 5 V) (Fig. 6) CTR - 500 600 %
Collector-emitter saturation voltage (ILED = 10 mA, VCOMP = VFB, IC = 2.5 mA) (Fig. 6) VCE (SAT) - 0.099 0.5 V
Isolation Characteristics @ 25°C
Input-output insulation leakage current (RH = 45%, TA = 25°C, t = 5s, VI-O = 3000
VDC) (note. 3) II-O - - 1.0 µA
Withstand insulation voltage (RH <= 50%, TA = 25°C, t = 1 min) (notes. 3) VISO 2500 - - Vrms
Resistance (input to output) VI-O = 500 VDC (note. 3) RI-O - 1012 -Ω
Switching Characteristics @ 25°C
Bandwidth (Fig. 7) BW- 10 - kHZ
Common mode transient immunity at output
high
(ILED = 0 mA, Vcm = 10 VPP RL = 2.2 kΩ (Fig.8)
(note. 4) |CMH| - TBD - kV/µs
Common mode transient immunity at output
low
(ILED = 10 mA, Vcm = 10 VPP RL = 2.2 kΩ
(Fig.8) (note. 4) |CML| - TBD - kV/µs
1. The deviation parameters VREF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature
coefficient of the reference input voltage, ∆VREF, is defined as:
|∆VREF| (ppm/°C) = {VREF (DEV)/VREF (TA 25°C)} X 106 / ∆TA
where ∆TA is the rated operating free-air temperature range of the device.
2. The dynamic impedance is defined as |ZOUT| = ∆VCOMP/∆ILED. When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by:
|ZOUT, TOT| = ∆V/∆I ≈ |ZOUT| X [1 + R1/R2]
3. Device is considered as a two terminal device: Pins 1, 2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are shorted together.
4. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the common mode impulse signal, Vcm, to assure that the output will remain high.
Common mode transient immunity at output low is the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse signal,Vcm, to assure that the output will remain low.
Electrical Characteristics: Relay
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LIA130
R00A.4
PRELIMINARY
I(LED)
V(LED)
VCOMP
VCOMP
ICEO
VCE
VREF
VCE
I(LED)
VF
VREF VREF
8 2
3
2
3
VV
V
6
7
5
I(LED)
I(LED) I(C)
I(OFF)
IREF
8
6
2
3
2
3
2
3
V
V
7
5
8
6
7
5
8
6
7
5
8
6
2
3
7
5
R1
8
6R1
R2
7
5
FIG. 1. V
REF
, V
F,
I
LED
(min) TEST CIRCUIT
FIG. 3. I
REF
TEST CIRCUIT
FIG. 5. I
CEO
TEST CIRCUIT FIG. 6. CTR, V
CE(sat)
TEST CIRCUIT
FIG. 4. I
(OFF)
TEST CIRCUIT
FIG. 2. ∆V
REF/
∆V
COMP
TEST CIRCUIT
LIA130
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R00A.4
PRELIMINARY
3
2
1
4
8
7
6
AB
5
3
4
2
1
6
5
7
8
VCC = +5V DC
VCC = +5V DC
IF = 10 mA
IF = 0 mA (A)
IF = 10 mA (B)
VIN
0.47V
0.1 VPP
47Ω
VOUT
VOUT
VCM
10VP-P
R1
2.2kΩ
RL
1µf
+
_
Fig. 7 Frequency Response Test Circuit
Fig. 8 CMH and CML Test Circuit
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LIA130
R00A.4
PRELIMINARY
PERFORMANCE DATA*
*The Performance data shown in the graphs above is typical of device performance. For guaranteed parameters not indicated in the written specifications, please contact our
application department.
LIA130
LED Current vs. Cathode Voltage
VCOMP - Cathode Voltage (V)
ILED - Supply Current (mA)
-1.0
15
10
5
0
-5
-10
-15
-0.5 0.0 0.5 1.0 1.5
LIA130
LED Current vs. Cathode Voltage
VCOMP - Cathode Voltage (V)
ILED - Supply Current (µA)
-1.0
150
120
90
60
30
0
-30
-60
-90
-120
-150
-0.5 0.0 0.5 1.0 1.5
LIA130
Reference Voltage vs.
Ambient Temperature
VREF - Reference Voltage (V)
-40
1.40
1.37
1.34
1.31
1.28
-20 0 20 40 60 80
ILED = 10mA
LIA130
Reference Voltage vs.
Ambient Temperature
IREF - Reference Current (mA)
-40
110
100
90
80
70
60
50
-20 0 20 40 60 80 100
ILED = 10mA
R1 = 10 kΩ
LIA130
Off Current vs. Ambient Temperature
I(OFF) - Off Current (nA)
-40
0.5
0.4
0.3
0.2
0.1
0
-20 0 20 40 60 80 100
VLED = 13.2V
VFB = 0
LIA130
LED Forward Current vs. Forward Voltage
ILED - Forward Current (mA)
VF - Forward-Voltage (V)
0.8
20
15
10
5
0
0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
85ºC
55ºC
25ºC
-5ºC
LIA130
Dark Current vs. Temperature
ICEO - Dark Current (nA)
VCE = 10V
-40
50
40
30
20
10
0
-10
-20 0 20 40 60 80 100
LIA130
Current Transfer Ratio vs LED Current
(IC/IF) - Current Transfer Ratio (%)
ILED - Forward Current (mA)
VCE = 5V
0
700
600
500
400
300
200
100
0
5 10 15 20 25
LIA130
Saturation Voltage vs. Ambient Temperature
ILED = 10mA; IC = 10mA
VCE (sat) - Saturation Voltage (V)
-40
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-20 0 20 40 60 80 100
LIA130
Collector Current vs. Collector Voltage
IC - Collector Current (mA)
VCE - Collector-Emitter (V)
0
180
160
140
120
100
80
60
40
20
0
12345678910
ILED = 20mA
ILED = 10mA
ILED = 5mA
ILED = 1mA
LIA130
Delta VREF/Delta VCOMP
vs. Ambient Temperature
VCE (sat) - Saturation Voltage (V)
-40
-1.5
-2.0
-2.5
-3.0
-20 0 20 40 60 80 100
LIA130
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R00A.4
PRELIMINARY
PERFORMANCE DATA*
*The Performance data shown in the graphs above is typical of device performance. For guaranteed parameters not indicated in the written specifications, please contact our
application department.
LIA130
Voltage Gain vs. Frequency
Voltage Gain, A(Vo/Vin) dB
Frenquency kHz
10
15
0
-15
-30
100 1000
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LIA130
R00A.4
PRELIMINARY
The LIA130
The LIA130 is an optically isolated error amplifier.
It incorporates three of the most common elements
necessary to make an isolated power supply,
a reference voltage, an error amplifier, and an
optocoupler. It is functionally equivalent to the
popular IX431 shunt voltage regulator plus the
optocoupler.
Powering the Secondary Side
The LED pin in the LIA130 powers the secondary
side, and in particular provides the current to run
the LED. The actual structure of the LIA130 dictates
the minimum voltage that can be applied to the LED
pin: The error amplifier output has a minimum of the
reference voltage, and the LED is in series with that.
Minimum voltage applied to the LED pin is thus 1.24V
+ 1.5V = 2.74V. This voltage can be generated either
directly from the output of the converter, or else from
a slaved secondary winding. The secondary winding
will not affect regulation, as the input to the FB pin
may still be taken from the output winding.
The LED pin needs to be fed through a current limiting
resistor. The value of the resistor sets the amount of
current through the LED, and thus must be carefully
selected in conjunction with the selection of the
primary side resistor.
Feedback
Output voltage of a converter is determined by
selecting a resistor divider from the regulated output
to the FB pin. The LIA130 attempts to regulate its FB
pin to the reference voltage, 1.24V. The ratio of the
two resistors should thus be:
RTOP/RBOTTOM = VOUT/VREF - 1
The absolute value of the top resistor is set by the
input offset current of 0.8µA. To achieve 1% accuracy,
the resistance of RTOP should be:
(VOUT - 1.24) / RTOP > 80µA
Compensation
The compensation pin of the LIA130 provides the
opportunity for the designer to design the frequency
response of the converter. A compensation network
may be placed between the COMP pin and the
FB pin. In typical low-bandwidth systems, a 0.1µF
capacitor may be used. For converters with more
stringent requirements, a network should be designed
based on measurements of the system’s loop. An
excellent reference for this process may be found in
“Practical Design of Power Supplies” by Ron Lenk,
IEEE Press, 1998.
Secondary Ground
The GND pin should be connected to the secondary
ground of the converter.
No Connect Pins
The NC pins have no internal connection. They
should not have any connection to the secondary
side, as this may compromise the isolation structure.
Photo-Transistor
The Photo-transistor is the output of the LIA130. In a
normal configuration the collector will be attached to a
pull-up resistor and the emitter grounded. There is no
base connection necessary.
The value of the pull-up resistor, and the current limiting
resistor feeding the LED, must be carefully selected to
account for voltage range accepted by the PWM IC,
and for the variation in current transfer ratio (CTR) of
the opto-isolator itself.
Example: The voltage feeding the LED pins is +12V,
the voltage feeding the collector pull-up is +10V. If
we select a 10KΩ resistor for the LED, the maximum
current the LED can see is (12V-2.74V) /10KΩ =
926µA. The CTR of the opto-isolator is a minimum of
100%, and so the minimum collector current of the
photo-transistor when the diode is full on is also 926µA.
The collector resistor must thus be such that:
(10V - 5V) / RCOLLECTOR < 926µA or RCOLLECTOR >5.4KΩ
select 10KΩ to allow some margin.
Clare, Inc. makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product
descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in Clare’s Standard Terms and Conditions of Sale, Clare, Inc. assumes no
liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement
of any intellectual property right.
The products described in this document are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended
to support or sustain life, or where malfunction of Clare’s product may result in direct physical harm, injury, or death to a person or severe property or environmental damage. Clare, Inc. reserves the right to
discontinue or make changes to its products at any time without notice.
Specification: DS-LIA130-R00A.4
©Copyright 2004, Clare, Inc.
All rights reserved. Printed in USA.
7/28/04
For additional information please visit our website at: www.clare.com
PRELIMINARY