View Poll Results: PWR OK hold-up time is 69× longer than voltage HUT, what to do?

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  • FAIL it

    6 85.71%
  • PASS it with HUGE penalty (like -20 points)

    1 14.29%
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Thread: What to do with such screwed hold-up time?

  1. #1
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    Default What to do with such screwed hold-up time?

    Chinese commrades somewhat screwed this up. While voltage hold-up time goes out in about 12 ms, PWR Good continues at 5 V for another 864 ms

    I must admit that, eh, I only considered units will be out of spec on the lower side. Now according to the spec, section 3.3, timing is REQUIRED so this is very wrong. So what, fail it? Pass it and give it huge evaluation penalty?

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    Maybe I'm wrong, but I don't see the difference between the output voltages going out of spec while the PSU is still receiving energy from the mains and while it isn't receiving anymore. The two are ultimately the same type of fail.

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    The voltage is in spec all right. Just somewhat too long

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    First I recommend to ask for a second sample to doublecheck. This could be just the problem of one sample.

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    Default

    Depends on price.
    The lower the price, the less there is to care.

    In the End it doesn't matter much at all...

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    Default

    Quote Originally Posted by Philipus II View Post
    First I recommend to ask for a second sample to doublecheck. This could be just the problem of one sample.
    As it seems, not the only problem. However, this is long chain of problems. Guess commrades need more experience, this is like a funny story already. Almost like if they just built a unit upon reference circuit of the ICs they use, and than started repairing problems. Each one at a time. There is still many of them, just depends how deeply you test it But rly, every version I had always showed different strange behaviour. (Cannot however share what exactly, previous units are under NDA.)

    The soldering quality of this piece is most likely the worst I've ever seen, maybe that also plays a role and something just does not work in there.

    I've requested second unit just to do the measurement testing so hopefully I'll get some soon, even if just lended from some store…
    Last edited by Behemot; 02-12-2017 at 01:37 PM.

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