APW7083 查看數據表（PDF） - Anpec Electronics

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APW7083

5A, 26V, 380kHz, Synchronous Step-Down Converter

Anpec Electronics 

APW7083

Pin Description

PIN

NO.

NAME

1

FB

2

3

4~7, 22

8~20

21, 23, 24

COMP

ZCS

PGND

LX

VIN

25

EN

26

UGND

27

VCC

28

GND

Block Diagram

FUNCTION

Feedback Input. The IC senses feedback voltage via FB and regulate the voltage at 0.8V.

Connecting FB with a resistor-divider from the output set the output voltage in the range from

0.8V to 90% VIN.

Output of error amplifier. Connect a series RC network from COMP to GND to compensate the

regulation control loop. In some cases, an additional capacitor from COMP to GND is required

for noise decoupling.

Zero-Crossing Sense pin. Please externally connect this pin with LX.

POWER Ground pins. All these pins must be connected externally to the power ground plane.

Power Switching Output. Connect this pin to the underside Exposed Pad.

Power Input. VIN supplies the power (4.5V to 26V) to the control circuitry, gate driver and

step-down converter switch. Connecting a ceramic bypass capacitor and a suitably large

capacitor between VIN and GND eliminates switching noise and voltage ripple on the input to

the IC.

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the

regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic start-up.

Gate driver power ground of the P-channel Power MOSFET. A linear regulator regulates a 5.5V

voltage between VIN and UGND to supply power to P-channel MOSFET gate driver. Connect

a ceramic capacitor (1µF typ.) between VIN and UGND for noise decoupling and stability of the

linear regulator.

Bias input and 4.2V linear regulator’s output. This pin supplies the bias to some control circuits.

The 4.2V linear regulator converts the voltage on VIN to 4.2V to supply the bias when no

external 5V power supply is connected with VCC. Connect a ceramic capacitor (1µF typ.)

between VCC and GND for noise decoupling and stability of the linear regulator.

Signal Ground.

VIN

VCC

FB

COMP

EN

GND

4.2V Regulator

and

Power-On-Reset

VCC

POR

Current-

Limit

118%VREF

70%VREF

OVP

UVP

Soft-Start

and

Fault Logic

Soft-Start

VREF

0.8V

Gm

Error

Amplifier

2.5V

0.8V

ENOK

Enable

Over-

Temperature

Protection

Current Sense

Amplifier

Zero-Crossing

Comparator

Inhibit

Gate

Control

Current

Compartor

Slope

Compensation

Oscillator

FB

380kHz

UG

Gate

Driver

VCC

LG

Gate

Driver

Linear

Regulator

VIN

ZCS

UGND

LX

PGND

Copyright © ANPEC Electronics Corp.

11

Rev. A.5 - Sep., 2011

www.anpec.com.tw

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