LX6503IPW Datasheet PDF - Microsemi

●The LX6503 is a high performance CCFL controller optimized for LCD-TV and other multi-lamp LCD display systems. It particularly provides a cost competitive solution for off-PFC inverter applications. The controller provides a pair of push-pull PWM drive signals with adequate capacity to drive a push-pull, half bridge, or full bridge CCFL inverter configuration with the addition of simple external circuitry. An on-chip regulator supplies both the operating voltage for the output gate drive and bias to the internal control circuitry. This allows a direct connection of the controller to the system supply extending the voltage up to 27V without external regulators. In addition the controller includes a synchronization capability that allows the user to synchronize both the frequency and phase of the lamp current between inverters or to an external synchronization signal. The lamp current regulation circuit comprises a simple and robust control loop design with good regulation accuracy and dynamic response at transient conditions. Furthermore a soft start feature provides more reliable lamp strike and allows effective control of the possible inverter start up surge current and lamp current/voltage overshoot. Lamp dimming operation is also well considered to facilitate convenient and flexible dimming control design with synchronization capability. In addition, reliable fault detection and protection functions are facilitated including open lamp, over voltage, short circuit, and over current protection. Furthermore, programmable striking frequency, programmable strike and protection timing, and fault indication are all built-in with the very compact chip design. The device is available in the 16 lead TSSOP and SOIC wide body surface mount packages in the industrial temperature range.