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TPS75003: TPS75003 - Triple (Two Bucks, One LDO) supply chip - at least one has been rendered inoperative

Kenneth Aquino
Expert 1300 points
Part Number: TPS75003

Hi,

Please refer to the attached (or pasted) portion of the schematic below.  I am using this TPS75003 to provide power to a Xilinx FPGA, a Virtex.  I am getting this information second hand, so I apologize in advance.  I am told that at least on of the TPS75003 has failed when used in this circuit.  The part was then replaced and seems to be working now.  The circuit is almost identical to the "Typical Application" circuit that is in the TPS75003 data sheet except that my circuit does not have capacitors connected between the TPS75003 "SS" pins and ground.  I do understand that with nothing connected to those pins, the TPS75003 still provides about 250 us of rise time.  The other difference is that my circuit's LDO output is not 2.5 volts as in the "Typical Application" circuit, but is slightly lower.

If anyone sees anything obvious that I may have missed please let me know.

Regards,

Ken

  • 0
    TI__Mastermind 20580 points
    Hi Ken, We have assigned an engineer to review and do a little investigation to see if we see anything. - Scott
  • 0 in reply to Scott Monroe
    Expert 1300 points
    Scott,

    I appreciate this, it is a very important application for our compay into which this circuit is designed. Please let me know if I can provide you with any more information.

    Ken
  • 0
    TI__Genius 10000 points
    Ken,

    After looking over your schematic, nothing looks obviously wrong or missing. I can also suggest that you look at the schematic in the TPS75003EVM User's Guide. It has another version of the schematic that has differing capacitance and inductive values for the output rails than in your schematic. Refining these values could increase the performance of your circuit.

    Please let me know if you are experiencing any issues with the new device you replaced in your circuit.

    Thanks,
    Nastasha