Datasheet > LM5021

LM5021

更新时间： 2024-11-13 22:47:03

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
15页	745K
描述
AC-DC Current Mode PWM Controller

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LM5021 数据手册

May 2005

LM5021

AC-DC Current Mode PWM Controller

General Description

Features

n Ultra Low Start-up Current (25 µA maximum)

n Current Mode Control

The LM5021 off-line pulse width modulation (PWM) control-

ler contains all of the features needed to implement highly

efficient off-line single-ended flyback and forward power con-

verters using current-mode control. The LM5021 features

include an ultra-low (25 µA) start-up current, which mini-

mizes power losses in the high voltage start-up network. A

skip cycle mode reduces power consumption with light loads

for energy conserving applications (ENERGY STAR^®,

CECP, etc.). Additional features include under-voltage lock-

out, cycle-by-cycle current limit, hiccup mode overload pro-

tection, slope compensation, soft-start and oscillator syn-

chronization capability. This high performance 8-pin IC has

total propagation delays less than 100nS and a 1MHz ca-

pable oscillator that is programmed with a single resistor.

n Skip Cycle Mode for Low Standby Power

n Single Resistor Programmable Oscillator

n Synchronizable Oscillator

n Adjustable Soft-start

n Integrated 0.7A Peak Gate Driver

n Direct Opto-Coupler Interface

n Maximum Duty Cycle Limiting (80% for LM5021-1 or

50% for LM5021-2)

n Slope Compensation for (LM5021-1 Only)

n Under Voltage Lockout (UVLO) with Hysteresis

n Cycle-by-Cycle Over-Current Protection

n Hiccup Mode for Continuous Overload Protection

n Leading Edge Blanking of Current Sense Signal

Packages: MSOP-8 or MDIP-8

Simplified Application Diagram

20144201

DS201442

www.national.com

12 3 4 5 6 7...15

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