L6565D Integrated Circuit Chip QUASI - RESONANT SMPS CONTROLLER
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L6565 QUASI-RESONANT SMPS CONTROLLER
■ 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 ■ TV/MONITOR SMPS ■ AC-DC ADAPTERS/CHARGERS ■ DIGITAL CONSUMER ■ PRINTERS, FAX MACHINES, PHOTOCOPIERS AND SCANNERS
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.
BLOCK DIAGRAM
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