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 MOSFETs turn-on.

■ QUASI-RESONANT (QR) ZERO-VOLTAGE-SWITCHING (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

■ TV/MONITOR SMPS

■ AC-DC ADAPTERS/CHARGERS

■ DIGITAL CONSUMER

■ PRINTERS, FAX MACHINES, PHOTOCOPIERS AND SCANNERS