Current Mode PWM Controller 400mA 8-Pin SO N T/R

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.

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

TV/MONITOR SMPS

AC-DC ADAPTERS/CHARGERS

DIGITAL CONSUMER

PRINTERS, FAX MACHINES, PHOTOCOPIERS AND SCANNERS