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Testing a Dual Output DC-DC Converter?

Discussion in 'Electronic Repair' started by Eric J, Sep 30, 2003.

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  1. Eric J

    Eric J Guest

    To get a dual output DC-DC converter to start, do both outputs need to
    have a load? If it does, both loads would use the common reference
    'ground' correct?
    I read the repair FAQ on SMPS testing, but didn't notice anything
    about dual output converters. I just want to make sure I'm not going
    to fry something by testing it wrong.

    Thanks in advance.
     
  2. Jerry G.

    Jerry G. Guest

    All your questions depend on the design of the unit. There are converter
    units that must have a load, and others that can free run with no danger of
    damage, or no shut down at all. Many of these units that are from
    particular appliances and devices are designed to work with specific load
    factors. There are many reasons why the engineers will choose to do so.

    The universal type or general utility devices that are designed to stand
    alone, are the ones that can usually be used with no specific load
    specification. This would up to the rated maximum allowable load.

    You would be best off to enquire to the manufacture for speciation and
    application ratings for your device. Or, if you can have a detailed
    schematic and have the knowledge base, you can trace out the circuits and
    make the determination for yourself.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    Instruments http://www.zoom-one.com/glgtech.htm
    =========================================


    To get a dual output DC-DC converter to start, do both outputs need to
    have a load? If it does, both loads would use the common reference
    'ground' correct?
    I read the repair FAQ on SMPS testing, but didn't notice anything
    about dual output converters. I just want to make sure I'm not going
    to fry something by testing it wrong.

    Thanks in advance.
     
  3. If you mean a potted brick converter, they usually will run with
    no load but to be safe, put 10 percent load on both outputs.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
  4. N3KCT

    N3KCT Guest

    At work,we check the potted brick converters at no-load
    with low&high extreme input voltages. Then we do a
    full load test at extreme input voltages. Then we repeat
    the whole thing at -40degC, and again at +85degC.
    Usually when they fail, they fail under the hot tests, at full load,
    due to output voltage sag.
     
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