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TPS7B7702-Q1: Vsense resistor

Lee, Sam
Expert 6035 points
Part Number: TPS7B7702-Q1

Hi team,

Can you answer the followin gquestion of TPS7B7702-Q1?

If Vsense resistor is installed more than recommended equation, the Vsense in normal operation will exceed 2.4V (Short circuit and Current limit range) according to calculation, although it’s not reached to current limit by external register settings.

However, what is the actual Vsense voltage at that time? Will Vsense remain within the current limit range of 2.4V~2.65V(or 2.4V~3.3V)? Otherwise, it wll output unknow random voltage?

Thanks,

Sam Lee

  • 0
    TI__Mastermind 23361 points

    Hi Sam, 

    This is a very good question. As the datasheet requires Rsense <=192x2.4/Iomax to avoid overlap, I would suggest strictly following the datasheet recommendation. If Rsense is higher than the calculated max, there will be overlap between normal operation and current limit or short-to-ground phase. 

    When in an error state, the sense pin current will be higher, since there are min and max for the current limit faulty voltage, I would expect that during the current limit error, the sense pin will also be pulled up to around 2.55V but please advise your customers having a higher than recommended Rsense is violating datasheet condition and the device is tested and designed within recommended conditions. 

    Regards, 
    Jason Song