L6565DTR 开关控制器 ST

L6565DTR

开关控制器 Current-Mode Pri Cnt

QUASI-RESONANT SMPS CONTROLLER

DESCRIPTION L6565DTR

The L6565DTR 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.

■ QUASI-RESONANT (QR) ZERO-VOLTAGESWITCHING

(ZVS) TOPOLOGY

■ LINE FEED FORWARD TO DELIVER

CONSTANT POWER vs. MAINS CHANGE

■ FREQUENCY FOLDBACK FOR OPTIMUM

STANDBY EFFICIENCY

■ PULSE-BY-PULSE & HICCUP-MODE OCP

■ ULTRA-LOW START-UP (< 70μA) AND

QUIESCENT CURRENT (< 3.5mA)

■ DISABLE FUNCTION (ON/OFF CONTROL)

■ 1% PRECISION (@ Tj = 25°C) INTERNAL

REFERENCE VOLTAGE

■ ±400mA TOTEM POLE GATE DRIVER WITH

UVLO PULL-DOWN

■ BLUE ANGEL, ENERGY STAR, ENERGY

2000 COMPLIANT

APPLICATIONS L6565DTR

■ TV/MONITOR SMPS

■ AC-DC ADAPTERS/CHARGERS

■ DIGITAL CONSUMER

■ PRINTERS, FAX MACHINES,

PHOTOCOPIERS AND SCANNERS