Datasheet > ML4825IS

ML4825IS

更新时间： 2024-09-29 22:46:11

品牌	Logo	应用领域
MICRO-LINEAR		开关光电二极管控制器
页数	文件大小	规格书
9页	175K
描述
High Frequency Power Supply Controller

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数据手册

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ML4825IS 数据手册

May 1997

ML4825*

High Frequency Power Supply Controller

GENERAL DESCRIPTION

FEATURES

■ Practical operation at switching frequencies to 1.0MHz

■ High current (2A peak) dual totem pole outputs

■ Wide bandwidth error amplifier

The ML4825 High Frequency PWM Controller is an IC

controller optimized for use in Switch Mode Power

Supply designs running at frequencies to 1MHz.

Propagation delays are minimal through the comparators

and logic for reliable high frequency operation while slew

rate and bandwidth are maximized on the error amplifier.

This controller is designed to work in either voltage or

current mode and provides for input voltage feed forward.

■ Fully latched logic with double pulse suppression

■ Pulse-by-pulse current limiting

■ Soft start and maximum duty cycle control

■ Under voltage lockout with hysteresis

A 1V threshold current limit comparator provides cycle-

by-cycle current limit while exceeding a 1.4V threshold

initiates a soft-start cycle. The soft start pin doubles as a

maximum duty cycle clamp. An under-voltage lockout

circuit with 800mV of hysteresis assures low startup

current and drives the outputs low.

■ Precision trimmed 5.1V bandgap reference

■ Pin compatible improved replacement for UC1825

■ Fast shut down path from current limit to outputs

■ Outputs preset to known condition after under voltage

lockout

This controller is similar in architecture and performance

to the UC1825 controller, however the ML4825 includes

many features not found on the 1825. These features are

set in Italics.

■ Soft start latch ensures full soft start cycle

■ Outputs pull low for undervotage lockout

BLOCK DIAGRAM (Pin configuration shown for 16-pin version)

*Some Packages Are Obsolete or End Of Life

CLOCK OUT

OSC

1.25V

RAMP

COMP

–

E/A OUT

PWR V

ERROR

AMP

–

OUT A

INV

V+

POWER GND

POWER V

TF.F.

9µA

OUT B

PWR GND

–

ENABLE

REF

1.5V V

REF

/SD

–

REF

GEN

LIM

–

INTERNAL

BIAS

–

1.4V

SIGNAL GND

UNDER

VOLTAGE

LOCKOUT

12 3 4 5 6 7...9

中文翻译

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