APW7065C Ver la hoja de datos (PDF) - Anpec Electronics

Número de pieza

componentes Descripción

Fabricante

APW7065C

Synchronous Buck PWM Controller

Anpec Electronics 

APW7065C

Synchronous Buck PWM Controller

Features

• Single 12V Power Supply Required

• Fast Transient Response

- 0~90% Duty Ratio

• 0.8V Reference with 1% Accuracy

• Shutdown Function by Controlling COMP

Pin Voltage

• Internal Soft-Start (1.7ms) Function

• Voltage Mode PWM Control Design

• Under-Voltage Protection

• Over-Current Protection

- Sense Low Side MOSFET’s RDS(ON)

• 300kHz Fixed Switching Frequency

• SOP-8 Package

• Lead Free and Green Devices Available

(RoHS Compliant)

Simplified Application Circuit

12V

VIN

APW7065C

L

VOUT

Pin Configuration

General Description

The APW7065C uses fixed 300kHz switching frequency,

voltage mode, synchronous PWM controller which drives

dual N-channel MOSFETs. The device integrates the

control, monitoring and protection functions into a

single package, provides one controlled power output

with under-voltage and over-current protections.

The APW7065C provides excellent regulation for

output load variation. The internal 0.8V temperature-com-

pensated reference voltage is designed to meet the re-

quirement of low output voltage applications. An built-in

digital soft-start with fixed soft-start interval prevents the

output voltage from overshoot as well as limiting the in-

put current.

The APW7065C with excellent protection functions:

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

cuit can monitor VCC supply voltage exceeds its thresh-

old voltage while the controller is running, and a built-in

digital soft-start provides output with controlled voltage

rise. The Over-Current Protection (OCP) monitors the

output current by using the voltage drop across the lower

MOSFET’s RDS(ON), comparing with internal VOCP (0.29V),

when the output current reaches the trip point, the IC

shuts off the converter and initiates a new soft-start

process. After two over-current events are counted,

the device turns off both high-side and low-side

MOSFETs and the converter's output is latched to be

floating. It requires a POR of VCC to restart. The Under-

Voltage Protection (UVP) monitors the voltage of FB pin

for short-circuit protection, when the VFB is less than

50% of VREF (0.4V), the controller will shutdown the IC

directly.

BOOT 1

UGATE 2

GND 3

LGATE 4

8 PHASE

7 COMP

6 FB

5 VCC

SOP-8

(APW7065C)

Applications

• Graphics Card

• Mother Board

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 - Mar., 2008

www.anpec.com.tw

Share Link: