Datasheet > APW7057KC-TU

APW7057KC-TU

更新时间： 2024-11-05 22:14:39

品牌	Logo	应用领域
茂达 - ANPEC		控制器
页数	文件大小	规格书
14页	155K
描述
High Power Step-Down Synchronous DC/DC Controller

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中文翻译

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APW7057KC-TU 数据手册

APW7057

High Power Step-Down Synchronous DC/DC Controller

Features

General Description

•

Operates from +5V Input

The APW7057 is a 300kHz constant frequency volt-

age mode synchronous switching controller that drives

external N-channel MOSFETs. When the input sup-

ply drops close to output, the upper MOSFET remains

on, achieving 100% duty cycle. Internal loop compen-

sation is optimized for fast transient response, elimi-

nating external compensation network. The precision

0.8V reference makes this part suitable for a wide va-

riety of low voltage applications. Soft start is internally

set to 2ms, limiting the input in-rush current and pre-

venting the output from overshoot during powering up.

The APW7057 has over current and short circuit

protections. Over current protection is achieved by

monitoring the voltage drop across the high side

MOSFET, eliminating the need for a current sens-

ing resistor and short circuit condition is detected

through the FB pin. If either fault conditions occur,

the APW7057 would initiate the soft start cycle. After

three cycles and if the fault condition persists, the

controller will be shut down. To restart the controller,

either recycle the V_CCsupply or momentarily pull the

OSCSET pin below 1.25V.

•

0.8V Internal Reference Voltage

- ±1.5% Accuracy Over Line, Load and Temp.

0.8V to V_CCOutput Range

Full Duty Cycle Range

•

- 0% to 100%

•

Internal Loop Compensation

Internal Soft Start

- Typical 2ms

•

Programmable Over-Current Protection

- Lossless Sensing Using MOSFET R_{DS (ON)}

Under-Voltage Protection

Drives External N-Channel MOSFETs

Shutdown Control

•

Small SOP-8 Package

Applications

The APW7057 can be shutdown by pulling the OCSET

pin below 1.25V. In shutdown, both gate drive signals

will be low. The controller is available in a small SOP-

8 package.

•

Motherboard

Graphics Cards

Cable or DSL Modems, Set Top Boxes

DSP Supplies

Memory Supplies

Pinouts

5V Input DC-DC Regulators

Distributed Power Supplies

PHASE

OCSET

BOOT

UGATE

GND

LGATE

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.

ANPEC Electronics Corp.

www.anpec.com.tw

Rev. A.3 - Oct., 2003

12 3 4 5 6 7...14

中文翻译

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