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TPS65150: failure in DRVP

Ruixin Feng
Intellectual 2445 points
Part Number: TPS65150


Hi team,

When using TPS65150 as below SCH, the DRVP can't work normally. For the test diagram, left one is abnormal and right one is normal. I asked customer to change a larger Cfly, but it still doesn't work. The negative charge pump and boost are good. Could you help to analyze and give some advice?

Thanks a lot!

Rayna

  • 0
    TI__Mastermind 18550 points

    Hello,

    The reason for VGH not being able to come up could be excessive capacitance at CPI and VGH nodes. Please remove the 10uF capacitors at these nodes (reference designators are hard to read on the schematics you attached but I think they are C148 and C149 for the 10uF capacitors at CPI and VGH nodes) and this should likely resolve the issue.

    Kind Regards,

    Liaqat