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componentes Descripción

Fabricante

APW7074

Synchronous Buck PWM Controller

Anpec Electronics 

APW7074

Synchronous Buck PWM Controller

Features

General Description

• Single 12V Power Supply Required

• 0.8V Reference with 1% Accuracy

• Shutdown and Soft-start Function

• 300KHz Fixed Switching Frequency

• Voltage Mode PWM Control Design

• Up to 100% Duty Cycle

• Under-Voltage Protection

• Over-Current Protection

• SOP-14 Package

• Lead Free Available (RoHS Compliant)

Applications

• Graphic Cards

The APW7074 uses fixed 300KHz switching frequency,

voltage mode, synchronous PWM controller which

drives dual N-channel MOSFETs. The device integrates

all of the control, monitoring and protecting functions

into a single package, provides one controlled power

output with under-voltage and over-current protections.

The APW7074 provides excellent regulation for

output load variation. The internal 0.8V temperature-

compensated reference voltage is designed to meet

the requirement of low output voltage applications.

The APW7074 with excellent protection functions:

POR, OCP and UVP. The Power-On-Reset (POR) cir-

cuit can monitor the VCC, EN, and OCSET voltage to

make sure the supply voltage exceeds their

threshold voltage while the controller is running.

The Over-Current Protection (OCP) monitors the out-

put current by using the voltage drop across the upper

and lower MOSFET’s RDS(ON). When the output cur-

rent reaches the trip point, the controller will run the

soft-start function until the fault events are removed.

The Under-Voltage Protection (UVP) monitors the volt-

age at FB pin (VFB) for short-circuit protection, when

the V is less 50% V , the controller will shutdown

FB

REF

the IC directly.

Pin Outs

NC 1

OCSET 2

SS 3

COMP 4

FB 5

EN 6

GND 7

14 V CC

13 PV CC

12 LGA TE

11 PGND

10 BOOT

9 UGA TE

8 PHASE

SOP-14

TOP V IEW

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.2 - Feb., 2006

www.anpec.com.tw

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