Datasheet > HT82P604B

HT82P604B

更新时间： 2024-01-31 00:39:24

品牌	Logo	应用领域
台湾合泰/盛群 - HOLTEK		/
页数	文件大小	规格书
7页	93K
描述
DC-DC Converter

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HT82P604B 数据手册

HT82P604B

DC-DC Converter

Preliminary

Features

Operating voltage: 5V~12V

Drives two N-Channel MOSFETs

Simple single-loop control design

5 bit digital-to-analog output voltage selection

Wide range -1.3V to 3.5V

0.1V binary steps from 2.1V to 3.5V

0.05V binary steps from 1.3V to 2.05V

Voltage-mode PWM control

Fast transient response

Power-good output voltage monitor

Over-voltage and over-current sensing ele-

ment, uses MOSFET¢s r_{DS (ON)}

Small converter size

High-bandwidth error amplifier

Full 0% to 100% duty ratio

Excellent output voltage regulation

±1% over line voltage and temperature

Constant frequency operation

200kHz free-running oscillator program-

mable from 50kHz to over 1MHz

Applications

Power supply for Pentium^TM, Pentium^TM

Pro, PowerPC^TMand Alpha^TMMicroproces-

sors

High-power5Vto3.xVDC-DCregulators

Low-voltage distributed power supplies

General Description

The HT82P604B provides complete control and

protection for a DC-DC converter optimized for

high performance microprocessor applications.

It is designed to drive two N-Channel

MOSFETs in a synchronous-rectified buck to-

pology. The HT82P604B integrates all of the

control, output adjustment, monitoring and

protection functions into a single package.

sient response. It includes a 200kHz

free-running triangle-wave oscillator that is

adjustable from below 50kHz to over 1MHz.

The error amplifier features a 15MHz

gain-bandwidth product and 6V/ms slew rate

which enables high converter bandwidth for

fast transient performance. The resulting

PWM duty ratio ranges from 0% to 100%.

The output voltage of the converter is easily ad-

justed and precisely regulated. The HT82P604B

includes a 5-input digital-to-analog converter

(DAC) that adjusts the output voltage from 2.1V

to 3.5V in 0.1V increments and from 1.3V to

2.05V in 0.05V steps. The precision reference

and voltage-mode regulator hold the selected

output voltage to within ±1% over temperature

andlinevoltagevariations.

The HT82P604B monitors the output voltage

with a window comparator that tracks the DAC

output and issues a Power Good signal when

the output is within ±10%. The HT82P604B

protects against over-current conditions by in-

hibiting PWM operation. Built-in over-voltage

protection triggers an external SCR to crowbar

the input supply. The HT82P604B monitors the

current by using the r_DS

of the upper

(ON)

MOSFET which eliminates the need for a cur-

rent sensing resistor.

The HT82P604B provides simple, single feed-

back loop, voltage-mode control with fast tran-

Pentium is a trademark of Intel Corporation

March 23, 2000

12 3 4 5 6 7

中文翻译

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