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Need VGL Before than VS(AVDD) it looks TPS65150 can't meet this requirement, need suggestion.

robinfeng
Intellectual 960 points
Other Parts Discussed in Thread: TPS65160

Dear expert:

      it looks on TPS65150 data sheet, the VS is always before than VGL, any solution can solve below problem? 5V power supply needed, so TPS65160 can't use. thanks.

Robin

  • 0
    TI__Guru 65470 points

    Hello Robin,

    It would be possible to start VGH and Vs later than VGL if you are using an external isolation switch and a external signal to control it. See Figure 27 for this application and Figure 33 how such an isolation switch could be connected in series to Vs. You cannot use GD as turn on signal for this switch because then the charge pumps will again start after Vs.

    Best regards,
    Brigitte