APW7120A 查看數據表（PDF） - Anpec Electronics

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APW7120A

5V to 12V Supply Voltage, 8-PIN, Synchronous Buck PWM Controller

Anpec Electronics 

APW7120A

5V to 12V Supply Voltage, 8-PIN, Synchronous Buck PWM Controller

Features

General Description

• Operating with Single 5~12V Supply Voltage or

Two Supply Voltages

• Drive Dual Low Cost N-Channel MOSFETs

- Adaptive Shoot-Through Protection

• Built-in Feedback Compensation

- Voltage-Mode PWM Control

- 0~100% Duty Ratio

- Fast Transient Response

• ±2% 0.8V Reference

- Over Line, Load Regulation, and Operating

Temperature

• Programmable Over-Current Protection

- Using R of Low-Side MOSFET

DS(ON)

• Hiccup-Mode Under-Voltage Protection

• 118% Over-Voltage Protection

• Adjustable Output Voltage

• Small Converter Size

- 300kHz Constant Switching Frequency

- Small SOP-8 Package

• Built-In Digital Soft-Start

• Shutdown Control Using an External MOSFET

• Lead Free and Green Devices Available

(RoHS Compliant)

The APW7120A is a fixed 300kHz frequency, voltage mode,

and synchronous PWM controller. The device drives two

low cost N-channel MOSFETs and is designed to work

with single 5~12V or two supply voltage(s), providing ex-

cellent regulation for load transients.

The APW7120A integrates controls, monitoring and pro-

tection functions into a single 8-pin package to provide a

low cost and perfect power solution.

A power-on-reset (POR) circuit monitors the VCC supply

voltage to prevent wrong logic controls. An internal 0.8V

reference provides low output voltage down to 0.8V for

further applications. An built-in digital soft-start with fixed

soft-start interval prevents the output voltage from over-

shoot as well as limiting the input current. The controller’s

over-current protection monitors the output current by

using the voltage drop across the low-side MOSFET’s

R , eliminating the need of a current sensing resistor.

DS(ON)

Additional under voltage and over voltage protections

monitor the voltage on FB pin for short-circuit and over-

voltage protections. The over-current protection cycles the

soft-start function until 4 over-current events are counted.

Pulling and holding the voltage on OCSET pin below

0.15V with an open drain device shuts down the controller.

Pin Cinfiguration

Applications

• Motherboard

• Graphics Card

• High Current, Up to 20A, DC-DC Converters

BOOT 1

UGATE 2

GND 3

LGATE 4

8 PHASE

7 OCSET

6 FB

5 VCC

SOP-8

(Top View)

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise

customers to obtain the latest version of relevant information to verify before placing orders.

Copyright © ANPEC Electronics Corp.

1

Rev. A.3 - Nov., 2009

www.anpec.com.tw

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