L6565中文资料准谐振控制器数据手册ST规格书

描述 Description

The L6565 is a current-mode primary controller IC, specifically designed to build offline Quasi-resonant ZVS (Zero Voltage Switching at switch turn-on) flyback converters.

Quasi-resonant operation is achieved by means of a transformer demagnetization sensing input that triggers MOSFET's turn-on.

Converter's power capability variations with the mains voltage are compensated by line voltage feedforward. At light load the device features a special function that automatically lowers the operating frequency still maintaining the operation as close to ZVS as possible. In addition to very low start-up and quiescent currents, this feature helps keep low the consumption from the mains at light load and be Blue Angel and Energy Star compliant.

The IC includes also a disable function, an on-chip filter on current sense, an error amplifier with a precise reference voltage for primary regulation and an effective two-level overcurrent protection.

特性 Features

• TV/MONITOR SMPS
• BLUE ANGEL, ENERGY STAR, ENERGY 2000 COMPLIANT
• DIGITAL CONSUMER
• AC-DC ADAPTERS/CHARGERS
• PRINTERS, FAX MACHINES, PHOTOCOPIERS AND SCANNERS
• 1% PRECISION (@ Tj = 25˚C) INTERNAL REFERENCE VOLTAGE
• DISABLE FUNCTION (ON/OFF CONTROL)
• QUASI-RESONANT (QR) ZERO-VOLTAGE-SWITCHING (ZVS) TOPOLOGY
• FREQUENCY FOLDBACK FOR OPTIMUM STANDBY EFFICIENCY
• LINE FEED FORWARD TO DELIVER CONSTANT POWER vs. MAINS CHANGE
• ULTRA-LOW START-UP (< 70µA) AND QUIESCENT CURRENT (< 3.5mA)
• ±400mA TOTEM POLE GATE DRIVER WITH UVLO PULL-DOWN
• PULSE-BY-PULSE & HICCUP-MODE OCP

简介

L6565属于集成电路（IC）的ACDC转换器离线开关。由ST制造生产的L6565AC 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。