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, Ton(min), Toff(max)), current limit, Soft-Start, enable, error amplifier, and a trimmed reference.

FEATURES

■ Optimized for Off-Line and Battery Powered Operation

■ Internal Zero-Voltage Detector

■ Soft-Start

■ Pulse-by-Pulse Current Limit

■ Overdissipation Protection with Soft-Start

■ Overvoltage Protection with Soft-Start

■ Low-Current Standby mode

■ Programmable On/Off Timing

■ Enable Control

APPLICATIONS

■ Cold Cathode Fluorescent Lamps

■ Resonant Power Supplies

■ Power Supplies for Notebook Computers

■ Power Supplies for Personal Electronics