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TK75020TL Datasheet(PDF) 1 Page - TOKO, Inc |
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TK75020TL Datasheet(HTML) 1 Page - TOKO, Inc |
1 / 11 page January 1999 TOKO, Inc. Page 1 TK75020 FEATURES s Optimized for Off-Line and Battery Powered Operation s Internal Zero-Voltage Detector s Soft-Start s Pulse-by-Pulse Current Limit s Overdissipation Protection with Soft-Start s Overvoltage Protection with Soft-Start s Low-Current Standby mode s Programmable On/Off Timing s Enable Control APPLICATIONS s Cold Cathode Fluorescent Lamps s Resonant Power Supplies s Power Supplies for Notebook Computers s Power Supplies for Personal Electronics DESCRIPTION The TK75020 is a low-cost, high-performance Zero-Voltage Switching (ZVS) controller IC. The primary applications are in inverters for Cold Cathode Fluorescent Lamps (CCFL) and in ZVS quasi-resonant or multi-resonant converters. The combination of a unique (patent-pending) control concept and a ZVS resonant inverter generates low-distortion sine wave for the fluorescent lamp, leading to extended lamp life and high luminous efficiency. The IC features all necessary circuits of a controller for such applications, including externally adjustable timing parameters (frequency, T on(min), Toff(max)), current limit, Soft-Start, enable, error amplifier, and a trimmed reference. The same reference is used for undervoltage protection and other critical internal biases. Supply current in the “off” mode is kept at a minimum level (2 µA typical). Special care has been taken to avoid undesirable turn-on of the external power MOSFET when sufficient supply voltage is not available, or when the device is held in the off mode. Even with no V cc applied, the drive pin of the IC will sink in excess of 20 mA while maintaining the voltage below 1 V to prevent that leakage currents turn on the power MOSFET. An internal zero-voltage detector monitors the voltage across the MOSFET and ensures that the turn-on will only take place under zero-voltage conditions. A unique overdissipation protection prevents the overheating of the power MOSFET in case the zero-voltage switching is lost. The TK75020 is available in a 14-lead surface mount package. ORDERING INFORMATION TAPE/REEL CODE TL: Tape Left Tape/Reel Code TK75020 TK75020 75020 VCC DRV GND OVP EN CT TOFF(MAX) TON/SS Vref CL ZVD EAOUT EAINV ODP ZVS RESONANT CONTROLLER |
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