ML4823

更新时间： 2024-09-26 22:46:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
9页	123K
描述
High Frequency Power Supply Controller

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数据手册

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ML4823 数据手册

May 1997

ML4823

High Frequency Power Supply Controller

FEATURES

GENERAL DESCRIPTION

■ Practical operation at switching frequencies to 1.0MHz

■ High current (2A peak) totem pole output

■ Wide bandwidth error amplifier

The ML4823 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 for single-ended applications

using 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 max. duty cycle control

■ Under voltage lockout with hysteresis

■ 5.1V trimmed bandgap reference

A 1V threshold current limit comparator provides cycle-

by-cycle current limit and exceeding a 1.4V threshold

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

maximum duty cycle clamp. All logic is fully latched to

provide jitter-free operation and prevent multiple pulsing.

An under-voltage lockout circuit with 800mV of hysteresis

assures low startup current and drives the outputs low

during fault conditions.

■ Low start-up current (1.1mA)

■ Pin compatible improved replacement for UC3823

■ Fast shut down path from current limit to output

■ Soft start latch ensures full soft start cycle

■ Outputs pull low for undervoltage lockout

This controller is an improved second source for the

UC3823 controller; however, the ML4823 includes

features not found on the 3823. These features are set in

italics.

BLOCK DIAGRAM (Pin Configuration Shown for 16-Pin Version)

CLOCK OUT

OSC

1.25V

RAMP

COMP

E/A OUT

–

ERROR

AMP

V+

POWER V

INV

–

OUTPUT

SOFT START

POWER GND

–

REF

LIM

–

/S.D.

LIM

ENABLE

REF

5.1V V

REF

5.1V

GEN

REF

INTERNAL

BIAS

–

1.4V

UNDER

VOLTAGE

LOCKOUT

SIGNAL GND

REV. 1.0 10/12/2000

12 3 4 5 6 7...9

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与ML4823相关器件

型号	品牌	获取价格	描述	数据表
ML4823CP	FAIRCHILD	获取价格	High Frequency Power Supply Controller
ML4823CP	MICRO-LINEAR	获取价格	High Frequency Power Supply Controller
ML4823CQ	FAIRCHILD	获取价格	High Frequency Power Supply Controller
ML4823CQ	MICRO-LINEAR	获取价格	High Frequency Power Supply Controller
ML4823CS	FAIRCHILD	获取价格	High Frequency Power Supply Controller
ML4823CS	MICRO-LINEAR	获取价格	High Frequency Power Supply Controller
ML4823CSX	FAIRCHILD	获取价格	Switching Controller, Voltage-mode, 2A, 1000kHz Switching Freq-Max, BIPolar, PDSO16, SOIC-
ML4823IP	MICRO-LINEAR	获取价格	High Frequency Power Supply Controller
ML4823IQ	FAIRCHILD	获取价格	High Frequency Power Supply Controller
ML4823IS	FAIRCHILD	获取价格	High Frequency Power Supply Controller