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PMP8740: Not able to get the -5V

SATHISHKUMAR vishwanatha
Intellectual 495 points
Part Number: PMP8740


Hi,

We have referring PMP8740 design, TPS560200DBV switching buck converter, 

+5V is ok, 

-5V not getting.

Kindly support .

  • 0
    TI__Expert 6005 points

    Hello Sathishkumar,

    Do you have any load on 5V or 3.3V outputs? The -5V should be present, when on 5V or 3.3V output there are at least few milli-amps load, and, at the same time, on the 5V the load is less than 10mA. If you do not get any voltage on -5V output, it might be the inductor L1 not perfectly soldered. In order to check this out, please connect a scope probe to the cathode of D24: here you should have a square wave; if this does not happen, probably the pin 4 or 3 of L1 is not soldered. Please let me know.

    Best regards,

    Roberto