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TPS56221: Behavior when FB short to GND or Vout voltage

Katsu Matsunaga
Expert 7730 points
Part Number: TPS56221

Hello,

My customer is checking device behavior in trouble, so could you tell me a behavior of the device when FB pin in below state.

1. FB pin short to GND

2. FB pin short to Vout

Best regards,

Katsu

  • 0
    TI__Genius 16640 points

    1. FB pin short to GND

    If FB  pin is short to GND, there is no feedback voltage and device will switch and try to raise the FB voltage to 0.6V  but can not since it is shorted. 

    The output voltage will be approximately equal to the input voltage if there is no load.   

    2. FB pin short to Vout

    If FB pin is short to VOUT,  the output would be regulated to the VREF voltage of 600mV.