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TPS65105: TFT LCD regulator

Feng Shi
Prodigy 30 points
Part Number: TPS65105
Other Parts Discussed in Thread: TPS65150, TPS65100, TPS65140

Hi Sir,Could you please help recommend a TFT LCD regulator. I checked TPS65105. But the power sequence can not meet my request. Follow my LCD spec, the power up sequence should be 3.3V(10mA)->VGL(-7V, 1mA)->AVDD(10.4V, 50mA)->VGH(16V, 1mA).But the TPS65105 can not meet this sequence request.Thanks!

  • +1
    TI__Mastermind 18550 points

    Hello,

    3.3V and AVDD sequence can be controlled by external input signals EN/ENR but in all of our LCD bias devices (such as TPS65100/101/105, TPS65140/141/145, TPS65150), AVDD comes up first before VGL because VGL/VGH is derived from AVDD supply. One possible solution could to put a load switch between AVDD supply and the load and control this switch in the system to turn on after VGL has come up.

    Kind Regards,

    Liaqat