L5991数据手册集成电路（IC）的ACDC转换器离线开关规格书PDF

描述 Description

This primary controller I.C., developed in BCD60II technology, has been designed to implement off line or DC-DC power supply applications using a fixed frequency current mode control.

Based on a standard current mode PWM controller this device includes some features such as programmable soft start, IN/OUT synchronization, disable (to be used for over voltage protection and for power management), precise maximum Duty Cycle Control, 100ns leading edge blanking on current sense, pulse by pulse current limit, overcurrent protection with soft start intervention, and Standby function for oscillator frequency reduction when the converter is lightly loaded.

特性 Features

• PRIMARY OVERCURRENT FAULT DETECTION WITH RE-START DELAY
• PROGRAMMABLE SOFT START
• IN/OUT SYNCHRONIZATION
• PWM UVLO WITH HYSTERESIS
• INTERNAL 100ns LEADING EDGE BLANKING OF CURRENT SENSE
• LATCHED DISABLE
• PACKAGE: DIP16 AND SO16
• 100% AND 50% MAXIMUM DUTY CYCLE LIMIT
• PROGRAMMABLE DUTY CYCLE
• CURRENT-MODE CONTROL PWM
• LOW START-UP CURRENT (< 120µA)
• SWITCHING FREQUENCY UP TO 1MHz
• FULLY LATCHED PWM LOGIC WITH DOUBLE PULSE SUPPRESSION
• STANDBY FUNCTION
• HIGH-CURRENT OUTPUT DRIVE SUITABLE FOR POWER MOSFET (1A)

简介

L5991属于集成电路（IC）的ACDC转换器离线开关。由制造生产的L5991AC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。