Advanced Power
Electronics Corp.
FEATURES DESCRIPTION
Input Voltage3V to 20V
Output Voltage3.3V to 32V
Duty Ratio0% to 85% PWM Control
Oscillation Frequency500KHz.
Enable and Thermal Shutdown Function.
Internal Current Limit.
Built-in N-channel MOSFET
ESOP-8 & Pb-Free Package.
Data and specifications subject to change without notice 200812221
APE1911
PACKAGE & ORDERING INFORMATION
STEP-UP PWM DC/DC Converter
1
TYPICAL APPLICATION
The APE1911 is high efficient step-up DC/DC
converter. Large output current is possible having a built in
internal N channel MOSFET, and using an external coil and
diode.
The APE1911 can be operated at switching
frequencies of 500 kHz allowing for easy filtering and low
noise, the size of the external components can be reduced.
Output voltage is programmable with 1.0V of standard
voltage supply internal, and using externally connected
components, output voltage (FB) can be set up at will. The
soft-start time can be programmed by outside capacitor; the
function prevents overshoot at startup. Build inside Current
limit, Thermal Shutdown and enable functions.
VOUT = VFB x (1+R4/R3) , VFB = 1.0V, R3 = 1K ~3KΩ
VCC=5V
R4
11K
C2
0.47uF
C1
470uF
D1
B340A
C4
470uF
L1
22uH
Vout=12V
U1
APE1911
6
2
4
1
3
8
7
5
SW
Vcc
SS
EN
FB
SGND
PGND
SW
C7
0.1uF
C3
Option
R3
1K
R1
100K
0.47uF
C8
C5
4.7uF
Package Type
MP : ESOP-8
APE1911X
( Top View )
1
2
3
4
8
7
6
5
SS
FB
ESOP-8
AX5201
EN
VCC
SGND
PGND
SW
SW
Exposed
pad
(EP is connect to SW)
Advanced Power
Electronics Corp. APE1911
ABSOLUTE MAXIMUM RATINGS
VCC Pin Voltage (VCC) -----------------------------------
-
GND - 0.3V to GND + 22V
Feedback Pin Voltage (VFB) -----------------------------
-
GND - 0.3V to 6V
ON/OFF Pin Voltage (VEN) ------------------------------- GND - 0.3V to VCC
Switch Pin Voltage (VSW) --------------------------------
-
GND - 0.3V to 34V
SS Pin Voltage (VSS) --------------------------------------
-
GND - 0.3V to 6V
Power Dissipation (PD) ----------------------------------- Internally limited
Storage Temperature Range (TST) --------------------
-
-40°C to +150°C
Operating Junction Temperature (TOPJ) --------------
-
-20°C to +125°C
Thermal Resistance from Junction to Case(RthJC) 15°C/W
40°C/W
Note. RthJA is measured with the PCB copper area (connect to exposed pad) of approximately 1 in2(Multi-layer).
ELECTRICAL SPECIFICATIONS
(VIN=5V, VOUT=12V, TA=25C, unless otherwise specified)
Parameter SYM TEST CONDITION MIN TYP MAX UNITS
Operating Supply Voltage VCC 3 - 20 V
Output Voltage Range VOUT 3.3 - 32 V
Feedback Voltage VFB IOUT=0.1A 0.98 1 1.02 V
Feedback Bias Current IFB IOUT=0.1A - 0.1 0.5 uA
Quiescent Current ICCQ VFB=1.5V force driver off - 4 6 mA
Shutdown Supply Current ISD VEN =0V - 1 10 uA
Oscillation Frequency FOSC SW pin 400 500 600 KHz
Line Regulation VCC =3~0.8*Vout - 1 - %
Load Regulation IOUT=50m~1A - 1 - %
VSH High (regulator ON) 2 - -
VSL Low (regulator OFF) - - 0.8
ISH VEN=2.5V (ON) - 20 - uA
ISL VEN=0.3V (OFF) - -1 - uA
SS pin Current ISS -8-uA
Switching Current Limit ILIM-sw 2.8 3 - A
VCC=5V - 40 80
VCC=12V - 30 60
Efficiency EFFI VCC=5V, VOUT=12V, IOUT=0.5A - 92 - %
Maximum Duty Cycle DCMAX VFB=0V - 85 -
Minimum Duty Cycle DCMIN VFB=1.5V - 0 -
Thermal Shutdown Temp TSD - 145 - C
Internal MOSFET RDSON RDSON
2
Thermal Resistance from Junction to Ambient(RthJA)
EN Pin Input Current
V
EN Pin Logic input threshold
voltage
mΩ
%
Advanced Power
Electronics Corp. APE1911
PIN DESCRIPTIONS
PIN SYMBOL PIN DESCRIPITON
VCC
SW
FB
H : Normal operation
SS Soft-Start Pin.
PGND Power Ground pin
SGND
BLOCK DIAGRAM
EN
3
IC Power Supply Pin
Switch pin. Connect external inductor & diode here
Feedback Pin
L : Shutdown
Signal Ground pin.
Shutdown Pin
Phase
Compensation
+
-
PWM
Controller
+
-
Oscillator
Buffer
Driver
FB
EN
PGND
SW
Vcc
Thermal
Shutdown
Vref=1.0V
0.06V
8uA
SS
Regulator
V
EN
SGND
Advanced Power
Electronics Corp. APE1911
FUNCTION DESCRIPTION
PWM Control
Setting the Output Voltage
VOUT R3 R4
12V 1K 11K
15V 1.3K 18K
18V 1.3K 22K
24V 1.3K 30K
32V 2.2K 68K
Inductor Selection
VOUT 9V 12V 15V 18V
L1 Value 18uH 22uH 25uH 33uH
Input Capacitor Selection
4
Table 1 Resistor select for
output voltage setting
The APE1911 consists of DC/DC converters that employ a pulse-width
modulation (PWM) system. In converters of the APE1911, the pulse width varies in a
range from 0 to 85%, according to the load current. The ripple voltage produced by the
switching can easily be removed through a filter because the switching frequency
remains constant. Therefore, these converters provide a low-ripple power over broad
ranges of input voltage and load current.
Application circuit item shows the basic application circuit with APE1911 adjustable
output version. The external resistor sets the output voltage according to the following
equation:
For most designs, Low inductance values are physically smaller but require faster
switching, which results in some efficiency loss. The inductor value can be derived from
the following equation:
VOUT = 1.0V x (1+R4/R3)
L = [VIN x (VOUT-VIN)] / VOUT x ∆ IL x fLx
Where is inductor Ripple Current. Large value inductors lower ripple current and
small value inductors result in high ripple currents. Choose inductor ripple current
approximately 15% of the maximum input current 2.4A, ∆IL=0.18A.
The DC current rating of the inductor should be at least equal to the maximum load
current plus half the ripple current to prevent core saturation (2.4A+0.18A).
The input capacitor reduces the surge current drawn from the input and switching
noise from the device. The input capacitor impedance at the switching frequency shall be
less than input source impedance to prevent high frequency switching current passing to
the input. A low ESR input capacitor sized for maximum RMS current must be used.
The capacitor voltage rating should be at least 1.5 times greater than the input
voltage, and often much higher voltage ratings are needed to satisfy.
Advanced Power
Electronics Corp. APE1911
FUNCTION DESCRIPTION
Output Capacitor Selection
Output Capacitor Selection
5
The output capacitor is required to keep the output voltage ripple small and to
ensure regulation loop stability. The output capacitor must have low impedance at the
switching frequency. A low ESR capacitor sized for maximum RMS current must be
used. The low ESR requirements needed for low output ripple voltage.
The capacitor voltage rating should be at least 1.5 times greater than the input
voltage, and often much higher voltage ratings are needed to satisfy.
When laying out the PC board, the following suggestions should be taken to ensure
proper operation of the APE1911. These items are also illustrated graphically in below.
1. The power traces, including the Source trace, the Schottky and the C1 trace should
be kept short, direct and wide to allow large current flow.
2. The power ground is keep C4’s ground closed and far away signal ground.
3. The signal ground trance is distant from power ground trance.
4. The exposed pad is connecting to SW trace closely and widely. (Reduce IC
temperature)
5. Do not trace signal line under inductor.
(APE1911 PCB Layout -Top View)
Advanced Power
Electronics Corp. APE1911
TYPICAL PERFORMANCE CHARACTERISTICS
6
Advanced Power
Electronics Corp. APE1911
TYPICAL PERFORMANCE CHARACTERISTICS
7
(VCC=5V, Vout=12V, Load=0.8A, SS=0.47uF)
Power-ON Wave Enable-ON Wave
(VCC=5V, Vout=12V, Load=0.8A, SS=0.47uF)
VCC
SS
VOUT
ISW
VEN
SS
VOUT
ISW
Package Outline : ESOP-8
Millimeters
SYMBOLS MIN NOM MAX
A 5.80 6.00 6.20
B 4.80 4.90 5.00
C 3.80 3.90 4.00
D 0°4°8°
E 0.40 0.65 0.90
F 0.19 0.22 0.25
M 0.00 0.08 0.15
0.35 0.42 0.49
L 1.35 1.55 1.75
J
K
G
P 3.15 3.25 3.35
Q 2.25 2.35 2.45
1.All Dimension Are In Millimeters.
2.Dimension Does Not Include Mold Protrusions.
Part Marking Information & Packing : ESOP-8
1.27 TYP.
H
ADVANCED POWER ELECTRONICS CORP.
0.375 REF.
45°
J
L
1911MP
YWWSSS
Package Code
Part Number
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
B
A2
I
P
Q
8
