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SMPS-Test Plan and procedure for bring up and validation

balasubramani r
Expert 1170 points

Other Parts Discussed in Thread: UCC28064A, UCC256301

Hi Everyone,

Greetings !!

Iam new to the power supply design. We have designed power supply with UCC28064A and UCC256301 IC (PFC+LLC IC). Almost all design part are completed and now planning to start the testing . Before that want to know how start the bring up for these kind of power supply board since it is having high voltage i dont want to burn my board.

Want to know what is general method followed in design bring up by designer across this field. 

Share your suggestion and if there is any procedure/Test Plan available to this IC's please share. 

  • 0
    TI__Expert 8210 points
    Balasubramani

    We're glad to hear that you have a design with UCC28064A and UCC256301 built up. You're correct that an initial power up of a high voltage design with these parts can cause catastrophic damage if there is an error in the design or manufacture of the board so we recommend carefully testing it.

    Below are some tips we recommend when powering up a new design. It is not comprehensive and does not prevent failures. Please make sure you follow all high voltage safety procedures specified in your lab. There is always the chance that a new design can fail catastrophically. Power supply experts with many years of experience still have designs that explode and burn the board.

    - Test the UCC28064A and UCC256301 stage separate at first, then combine
    - Test and verify all low voltage circuity before applying any high voltage
    - Use an isolated AC power supply if possible
    - Use a AC power supply that has a current source limit, set the limit just above the max power you are testing.
    - Test at minimum input, minimum load first. Slowly scale up the power level and input voltage separately
    - Closely monitor key signals, do not increase voltage or power if you see a waveform that is not expected
    - Insure that your oscilloscope probes are all referenced to the same potential (if you're not using isolated probes)

    Best Regards,
    Eric