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Urgent: TPS2041C no output?

Paul Singh
Expert 2750 points
Other Parts Discussed in Thread: TPS2041C

Hi,

The schematic shows a TPS2041C connection which we intended to limit current of a USB device under 0.5A. The TPS2041C has been soldered without defect.

Then the processor apply voltage to both IN and ENn pin, as shown in the upper sub-graph of the oscilloscope screenshot. The two are always in opposite direction (180° phase difference), which is the expected behavior. However, the OUT pin never gives any output.

The *FLT pin of the device, always remains high (1.8V), which suggest that either

  1. the chip is not functioning
  2. the chip is functioning and there is neither over-current or over-temperature.

From the information can we conclude that the TPS2041C IC on the current board is bad?

Paul

  • 0
    TI__Intellectual 2795 points

    Hi,

    TPS2041C is active low. So recommend connect the IN and EN to external DC source to debug first. In addition, please note, the operation range of TPS2041C is 4.5V to5.5V, and max low input of EN is 0.7V.

    /FLT is an open drain, if TPS2041C don't work, it would always keep high. Can't indicate the chip if work.