LXE1686-01 Datasheet PDF - Microsemi

●DESCRIPTION The LXE1686-0x CCFL Inverter Evaluation Boards are designed to demonstrate Linfinity’s LX1686 Backlight Controller IC. It consists of a fully assembled and tested inverter circuit board. This design guide complements the LX1686 controller application note AN-13 that discusses the overall inverter design considerations. The purpose of the evaluation board is to allow a designer to quickly modify the basic inverter circuit to match his LCD panel requirements. It will allow easy customization of the inverter’s input and output characteristics to optimize the inverter design. LX1686 INVERTER TOPOLOGY The LX1686 based inverter is a single-stage controller that regulates lamp current for load and line variation using a high frequency (60 to 100kHz) PWM switching technique. Wide range digital dimming is achieved in a similar (but separate) manner using a low frequency (100 to 1000Hz) PWM lamp current burst mode technique. Together, this topology can offer the lowest power consumption and highest electrical operating efficiencies achievable from a DC to AC CCFL inverter. As with any high performance device, component load matching is a must to gain the most efficiency possible. Proper output transformer selection (see ‘Output Transformer Selection’) based on input voltage and CCFL load should be given careful consideration, for best inverter performance. EVALUATION BOARD FEATURES · Brightness control input conditioning: linear DC, potentiometer and/or PWM op-amp circuit · Over-voltage sensing: output voltage limiting, open load protection circuit · Over-current sensing: output current limiting, shorted load/output protection circuit · Open/short circuit output disabling: timeout output disabling comparator circuit · Input interface: full functionality, Banana jacks or 8 pin Molex connector · Output connector: fly wire or choose from a variety of most the common industry standards · Output transformer: choose from three power level transformer offerings from Microsemi LX1686 CONTROLLER FEATURES · Vertical frame rate synchronization input: pro-grammable to accept 45 to 500Hz · Brightness control input: linear DC control input · Direct PWM dimming input: logic level 100 to 1000Hz PWM, lamp current burst mode