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L6565 데이터시트(PDF) 1 Page - STMicroelectronics |
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L6565 데이터시트(HTML) 1 Page - STMicroelectronics |
1 / 17 page 1/17 L6565 January 2003 s QUASI-RESONANT (QR) ZERO-VOLTAGE- SWITCHING (ZVS) TOPOLOGY s LINE FEED FORWARD TO DELIVER CONSTANT POWER vs. MAINS CHANGE s FREQUENCY FOLDBACK FOR OPTIMUM STANDBY EFFICIENCY s PULSE-BY-PULSE & HICCUP-MODE OCP s ULTRA-LOW START-UP (< 70µA) AND QUIESCENT CURRENT (< 3.5mA) s DISABLE FUNCTION (ON/OFF CONTROL) s 1% PRECISION (@ Tj = 25°C) INTERNAL REFERENCE VOLTAGE s ±400mA TOTEM POLE GATE DRIVER WITH UVLO PULL-DOWN s BLUE ANGEL, ENERGY STAR, ENERGY 2000 COMPLIANT APPLICATIONS s TV/MONITOR SMPS s AC-DC ADAPTERS/CHARGERS s DIGITAL CONSUMER s 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) fly- back converters. Quasi-resonant operation is achieved by means of a transformer demagnetization sensing input that trig- gers MOSFET's turn-on. DIP8(Minidip) SO-8 ORDERING NUMBERS: L6565N L6565D QUASI-RESONANT SMPS CONTROLLER BLOCK DIAGRAM + - VREF2 VOLTAGE REGULATOR INTERNAL SUPPLY + - 2.5V R1 R2 + - DRIVER + - ZERO CURRENT DETECTOR 2.1V 1.6V VCC 8 1 23 4 ZCD VCC INV COMP VFF CS GD 7 5 GND 6 20V 40K 5pF BLANKING LINE VOLTAGE FEEDFORWARD Hiccup-mode OCP DISABLE R S Q STARTER 2 V + - Hiccup-mode OCP Starter STOP Q UVLO Blanking START |
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