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TPSM8A28: Margining with UCD

George Hong
Prodigy 40 points
Part Number: TPSM8A28

To margin TPSM8A28 using the UCD, would the capacitor in the margining R-C-R be connected to VSNS-? I don't think the capacitor can be connected directly to GND on the board, right?

  • +1
    TI__Genius 16670 points

    The RC is filtering a pwm signal from the UCD to a DC voltage.   

    The DC voltage and the other R is injecting a current into the FB pin to offset the output voltage.   

    The UCD uses a closed loop margining scheme by monitoring the output voltage.   

    VSNS- should be used for the C of the RCR circuit  to use the same reference point as the device.

    Another way could be to use the REFIN of SS/REFIN pin.