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Powering problem with TI- TPS65217C

umamaheswar peta
Expert 1370 points
Other Parts Discussed in Thread: TPS65217

Hi,

we have designed a Sitara processor based board which is powered by TPS65217C IC.

All the on board voltages for DDR, Processor and other devices are generated using  TPS65217C IC. 

Couple of months boards worked fine, now we are observing SYS_5V (out put from TPS65217) is falling down to 1.1V instead of 5V,

As SYS_5V is used internally to generate all the remaining voltages , we are not getting any of the out put voltages from TPS65217C.

 When I measured the voltages we found CORE and 3V3 voltages are shorted to GND.

 Same thing happened with second board also, for this board only 3V3 voltage is showing  short, SYS_5V is again dropped  to 1.1V.

 We have done all the possible passives removal like all decaps, resistors, dry solder effects etc which was not helped to remove the shots,

 As per the discussion we had, you will be having  idea about the problem we are facing, pls inform if you need any further information on this, Our both working boards are not usable right now because of this problem, our software team is looking for the boards,

 We are powering the board using external 5V through Adaptor.

 Your quick ideas in resolving this problem will be a great help.

Rgds,

Uma Mahesh

  • 0
    TI__Expert 3740 points

    Uma,

     

    Sounds like the device is in off state you will need to trigger a power-up event (see page 18 of the data sheet).

     

    Operation OFF state can only be entered from ACTIVE state. Whenever a fault occurs during operation such as thermal shutdown, power-good fail, under voltage lockout, or PWR_EN pin timeout (5 seconds), all power rails are shut-down and the device goes to OFF state. The device will remain in OFF state until the fault has been removed and a new power-up event has occurred.

     

    The PWR_EN pin is level sensitive (opposed to edge sensitive) and it makes no difference if it is asserted before or after the above power-up events. It must be asserted within 5 seconds of the power-up event otherwise the power-down sequence will be triggered and the device enters OFF state again.

    Janice

     

  • 0
    Prodigy 40 points
    Hi Umamaheswar peta,
    we are also experiencing the same problem,we tried to press down PWR_IN push button switch during power up to ensure proper power up sequence, But this didn't solve our problem, how do you solve this problem, pls share the detailed solution for this problem.