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TPS54618EVM-606 Problems

Stephan Schuler
Prodigy 40 points
Other Parts Discussed in Thread: TPS54618EVM-606

Hello,

I bought a TPS54618EVM-606 Evaluation Kit. I changed the resistor R9 to 33kOhm and R10 to 10kOhm to get a output voltage of about 3.3V.

When I now power up the DC/DC I only get about 2.4V and the VSNS is about 0.5V (not 0.799V). The PowerGood Output is high (that means everything is OK).

At the first try I started the kit without a load. Can this damage the chip?

I checked the resistor values double and triple and I also checked there are shortcuts or something else. But everything looks good.

Have anybody some hint for me?

Regards,

Stephan

  • 0
    TI__Guru**** 191445 points

    It is possible you have damaged the IC.  Sometimes excessive heat can damage the internal reference (it is difficult to control the temperature when hand soldering).  Since you see 0.5 V on VSENSE, that is probably the case.  You should try replacing the IC.

  • 0 in reply to JohnTucker
    Prodigy 40 points

    Thanks John! Then I think I can throw the kit awa, but I didn't heat up the kit very much... 

    I have not the equipment in the laboratory to replace a chip with a PowerPad...

    I think such a kit should be better designed for replacing resistors or capacitors. Thats the job of a evaluation kit....

  • 0 in reply to Stephan Schuler
    TI__Guru**** 191445 points

    It is somewhat unusual for damage to occur.  I hand solder on EVMs often to make modifications without any issue, but I have heard of it happening with that family of devices.  The layout is designed for a number of purposes.  It typically shows compactness of design and typical layout rather than spreading components out for easy modification.  In that sense it is more of a "marketing" tool than an easily modified board.  Can you tell me a little about your application and potential volumes?  i may be able to get you a pre-modified board.

  • 0 in reply to JohnTucker
    Prodigy 40 points

    Hi John,

    I just bought a new kit. I hope this will work better.

    But it's funny: Even with a damaged IC the kit works fine. I only have to replace the reference voltages in the formulas by my new 0,5V! :)