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Thread: PW-120-M Problem

  1. #1
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    Unhappy PW-120-M Problem

    OK, here is the issue:
    I have a PW-120-M and ITPS Sequencer which are running a normal ATX mobo and Athlon 1000 Mhz. The only thing installed on the board is a 256MB memory chip, 20GB Maxtor HD and ATI 32MB Fury video card. I connected everything with a 10awg. wire.
    Now this is the problem. When I start the car, after 5 seconds ITPS send the ATX pulse, the board powers up and shuts down after 3 SECONDS!!!!!
    Then I disconnected the ATX pulse from the mobo and tried to start it manually. Again , the same thing 3 seconds. Then I bypassed the ITPS altogether, and after about 15 times the board powered on. I also tried to use ITPS as a shutdown controller only (directly connected the PW-120-M to the battery), but still, the board powers up sometimes, and sometimes only for 3 seconds. Then after some more test it will power up, but it will not run the video card ( I am not even connecting the HD at this point.)
    At this point I am at a loss. Is it false advertising and this thing is shothing out 20W insted of 200W ( but I saw people using it and its working)

    I tried searching more info on this matter, but nothing helps.
    You guys here are my last hope.

  2. #2
    Raw Wave Rob Withey's Avatar
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    ITPS will limit your power to 60W if you are using the ITPS regulator (if you haven't bypassed it by shorting out two pads on the ITPS board).

    If you are not, most PW series power supplies have overvoltage protection since they don't regulate the 12v line.
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  3. #3
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    Yes, ITPS is limited to 60W (well not really if you cool it, since its heat sink is rated for 5A only), but that is why I bypassed it. As for the PW-120 over voltage protection, as far as I know its 14.5V. But I was trying to run it from a cold battery (car not running), so I doubt very much that it had more than 14.5V. When the car was running, I measured the output from the battery, and it was about 13-14V.
    This is why I am baffeled at the thing not working.

  4. #4
    Raw Wave Rob Withey's Avatar
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    Quote Originally Posted by Shmeker
    Yes, ITPS is limited to 60W (well not really if you cool it, since its heat sink is rated for 5A only
    I think you'll find the regulator is rated at 5A, not the heatsink:

    http://www.national.com/pf/LM/LM1084.html
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  5. #5
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    Yeah that is a better explanation , but I still think it will output more just heat up more. But you right it is rated at 60W,makes you ask why do they sell it in a package with a 200W power supply.
    I might be wrong, but in any case I still don't get why the PW-120 doesn't power up the mobo.

  6. #6
    FLAC
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    Smeker,

    Sorry to say, but I think your PW-120-M falls into this category. I believe it can really only provide about 60 watts of regulated power. That's probably why they recommend the 60W AC adapter if you're using it with AC....bummer
    MikeH

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