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TPS40170: OCP Design Issue

Brian Wang0928
Genius 14100 points
Part Number: TPS40170

We face the OCP design point issue with buck controller.

We found the measured point of OCP is NOT meeting to what we calculated. Could you advie what the problem is! Very thanks. e

1234.Presentation1.pptxVery Thanks.

Regards,

Brian

  • 0
    TI__Guru 74052 points
    Hi Brian,

    The BSC066 low-side FET has ~7mOhm Rds(on) at Vgs = 8V (the applicable gate drive voltage of the TPS40170). Maybe you can measure the voltage drop of the low-side FET. The programmed voltage drop at current limit is 9uA x 14.7k = 132mV.

    Regards,
    Tim