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characteristics P6KE200A

Discussion in 'Power Electronics' started by Bluejets, Jul 14, 2019.

  1. Bluejets

    Bluejets

    3,439
    696
    Oct 5, 2014
    Have an smps out of a HP Compaq with no output.

    Tracked down to no startup voltage whatsoever. Checked all surrounding components which appear ok.
    Curious about the ( TVS) P6KE200A diode as it shows a similar diode in the attached schematics.
    Actually the circuit below is almost identical in the HP unit which uses a TNY268 switcher.

    Diode tests ok as far as diode test is concerned but both in the schematic below and on the board in question it is shown with zener characteristics.

    I removed the diode and tested it on a zener tester which showed 12.9v.
    Am I barking up the wrong tree here or should the P6KE200A not be higher than that and how would one test it anyhow...?
     

    Attached Files:

  2. Martaine2005

    Martaine2005

    2,372
    626
    May 12, 2015
    There is an article on testing a TVS that @Harald Kapp linked to a few years back.
    May be of use to you.

    Martin
     
  3. Bluejets

    Bluejets

    3,439
    696
    Oct 5, 2014
    ok...thanks...
     
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