LM5027

更新时间： 2024-11-23 05:42:23

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
26页	529K
描述
Voltage Mode Active Clamp Controller

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LM5027 数据手册

August 18, 2009

LM5027

Voltage Mode Active Clamp Controller

General Description

Features

The LM5027 pulse-width modulation (PWM) controller con-

tains all of the features necessary to implement power con-

verters utilizing the Active Clamp / Reset technique. With the

active clamp technique, higher efficiencies and greater power

densities can be realized compared to conventional catch

winding or RDC clamp / reset techniques. Three control out-

puts are provided: the main power switch control (OUTA), the

active clamp switch control (OUTB), and secondary side syn-

chronous rectifier control (OUTSR). The timing between the

control outputs is adjustable with external resistors that pro-

gram internal precision timers. This controller is designed for

high-speed operation including an oscillator frequency range

up to 1 MHz and total PWM propagation delays less than 50

ns. The LM5027 includes a high-voltage startup regulator with

a maximum input voltage rating of 105V. Additional features

include Line Under Voltage Lockout (UVLO), separate soft-

start of main and synchronous rectifier outputs, a timer for

hiccup mode current limiting, a precision reference, and ther-

mal shutdown.

Voltage-Mode control

■

Line feed-forward PWM ramp

Internal 105V rated start-up bias regulator

Programmable line Under-Voltage Lockout (UVLO) with

adjustable hysteresis

Versatile dual mode over-current protection

Programmable volt-second limiter

■

Programmable soft-start

Programmable synchronous rectifier soft-start and stop

Precise 500mV over-current comparator

Current sense leading edge blanking

Programmable oscillator with 1 MHz maximum frequency

and synchronization capability

Precision 5V reference

■

Programmable time delays between outputs

Packages

eTSSOP-20

■

Typical Application Circuit

30099001

Simplified Active Clamp Converter

300990

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