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TPS62510 won't switch-on if device booted when warm

CH Chan
Prodigy 10 points
Other Parts Discussed in Thread: TPS62510

Hi guys,

I have a TI TPS62510 step-down converter in my design that's normally regulates 3.3V to 1.2V.

However, if i power-on the device when it is warm (30-40C), the TPS62510 won't start switching, the power mosfet stays open, and i get 2.7V at the output (3.3V - 2A IR drop).. very dangerous for the chippy at the end of it. I admit my ramp-up time for V-in to the TPS62510 is rather slow (300-500ms)

I'm wondering if anyone has observed a similar problem with their TPS62510? Is there are any recommendations on the maximum power supply ramp-up time for this IC to reliably start?

 

Regards,

CH

  • 0
    TI__Guru**** 150790 points

    Hi CH,

    Sorry for the delay in responding to your inquiry.  It looks like this was initially posted in a processor sub forum and was not moved here (to the right place).  Is this still an issue for you?

    Could you send a waveform of Vin, Vout, SW when this happens?  Also, we need a schematic and your board layout to investigate in our lab.  Have you tried reproducing this on the EVM?

    30-40 is not hot at all and the IC will work properly at this temperature when its circuitry/PCB is properly designed.