Copyright

© ANPEC Electronics Corp.

Rev. A.2 - Aug., 2009

APW7158

www.anpec.com.tw

11

Pin Description

PIN

NO.

NAME

FUNCTION

1

FB1

These pins are the inverting inputs of the error amplifiers of their respective regulators. They are used to

set the output voltage and the compensation components.

2

COMP1

These pins are the outputs of error amplifiers of their respective regulators. They are used to set the

compensation components.

3

COMP2

These pins are the outputs of error amplifiers of their respective regulators. They are used to set the

compensation components.

4

FB2

These pins are the inverting inputs of the error amplifiers of their respective regulators. They are used to

set the output voltage and the compensation components.

5

REFIN

This pin is the reference input voltage of error amplifier of OUT2. It also provides the voltage into a buffer,

which is out on the REFOUT pin.

6

REFOUT

This pin provides a buffed voltage, which is from REFIN pin. A 0.1

µF capacitor to ground is recommended

for stability.

7

SS1/EN1

8

SS2/EN2

These pins provide two functions. Connect a capacitor to the GND for setting the soft-start time. Use an

open drain logic signal to pull the SS/EN pin low to disable the respective output, leave it open to enable

the respective output.

9

VREF

This pin provides a 3.3V reference voltage, which can be used by the REFIN pin or other ICs as a voltage

reference. A 1

µF capacitor to ground is recommended for stability.

10

FS

This pin is used to adjust the switching frequency. Connecting a resistor from FS pin to GND increases the

switching frequency. Conversely, connecting a resistor from this pin to VCC12 reduces the switching

frequency.

11

GND

This pin is the signal ground pin for the IC.

12

UGATE2

These pins provide the gate driver for the upper MOSFETs of OUT1 and OUT2 respectively.

13

BOOT2

These pins provide the bootstrap voltage to the gate driver for driving the upper MOSFETs. A boostrap

circuit may be used to create a BOOT voltage.

14

PGND

This pin is the power ground for the gate driver circuits. It should be tied to the GND.

15

LGATE2

16

LGATE1

These pins provide the gate driver for the lower MOSFETs of OUT1 and OUT2.

17

VCC12

Power Supply Input Pin. Connect a nominal 12V power supply to this pin for the gate driver circuits. A

decoupling capacitor (1 to 10

µF) to GND is recommended for noise decoupling.

18

UGATE1

These pins provide the gate driver for the upper MOSFETs of OUT1 and OUT2 respectively.

19

BOOT1

These pins provide the bootstrap voltage to the gate driver for driving the upper MOSFETs. A boostrap

circuit may be used to create a BOOT voltage.

20

VCC

Power Supply Input Pin. Connect a nominal 5V power supply to this pin for the control circuits, or connect a

resistor (nominally 300

Ω) to VCC12 to function this pin as a shunt regulator (typical 5.8V). A decoupling

capacitor (1 to 10

µF) to GND is recommended for noise decoupling.