G5217 [GMT]

24V Input Voltage-Mode Buck PWM Controller;


型号：	G5217
厂家：	GLOBAL MIXED-MODE TECHNOLOGY INC
描述：	24V Input Voltage-Mode Buck PWM Controller
文件：	总1页 (文件大小：76K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Global Mixed-mode Technology Inc.

G5217

24V Input Voltage-Mode Buck PWM Controller

Features

General Description

Drives Two N-Channel MOSFETs

Operates at 5V to 24V Supply Voltage

Internal Bootstrap Diode Circuit

Voltage-Mode PWM Control

Fast Transient Response

0.8V, 2% Accuracy Reference Voltage

Internal Soft Start

Constant 300kHz Switching Frequency

Over-Current Fault Monitors by Using

Low-Side MOSFET R_DS(ON)

The G5217 provides complete control and protection

for a DC-DC converter for high power applications. It is

designed to drive two N-channel MOSFETs in a syn-

chronous-rectified buck topology. The G5217 inte-

grates all of the control, bootstrap diode and protection

functions into a single package.

The G5217 provides simple, single feedback loop,

voltage-mode control with fast transient response. It

includes a 300kHz free-running triangle-wave oscilla-

tor. The error amplifier features a 15MHz gain-band-

width product which provides high converter band-

width for fast transient performance. The resulting

PWM duty ratio ranges from 0% to 80%. The refer-

ence voltage is 0.8V, 2% accuracy.

Output Under-Voltage Protection

Applications

16V to 30V Input High Power DC-DC Regulators

Low-Voltage Distributed Power Supplies

The G5217 has internal soft start and executes cy-

cle-by-cycle current limit during soft start interval. The

G5217 monitors the current by using the R_DS(ON)of the

low-side MOSFET which eliminates the need for a

current sensing resistor. The under-voltage protection

function monitors voltage at FB pin. The over-current

and under-voltage events after soft-start interval trig-

ger hiccup mode protection.

Ordering Information

ORDER

NUMBER

G5217P11U

TEMP.

RANGE

-40°C~ +85°C

PACKAGE

(Green)

SOP-8

MARKING

G5217

Note: P1: SOP-8

1: Bonding Code

U: Tape & Reel

Pin Configuration

Typical Application Circuit

5V ~ 24V

220µF

G5217

10Ω

G5217

BOOT

VCC

UGATE

BOOT

VCC

4.7µF

0.1µF

UGATE

3µH

V_O=13.5V

R_OCSET

OCSET

LGATE

GND

OCSET

LGATE

2000µF

10nF

620Ω

GND

SHDN

SOP-8

39Ω

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 0.2

Jan 13, 2010

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