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Thread: DC DC converter extending connection cable possible?

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    DC DC converter extending connection cable possible?

    Hi!

    I wanna know if can modify my DC DC converter (12 V to 5V) i plan to put on my car.
    I wanna know if its possible to extend the cable that goes from the DC DC to the device i wanna connect to. I mean, this cable needs more 30 cm at least to get on the device i plan to install but what i need to know is if there is any problem with the voltage/current that will have, since i am making changes to the original one.
    The DC DC goes for 2 Ampere current and i really need the 2A cause i will connect a DVD drive and its really 2A.

    THANKS!

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    why not extend the converter to the location of the dvd drive? that way, your extending it before the voltage regulator, so the dvd drive can get the full power without a problem..

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    Quote Originally Posted by soundman98 View Post
    why not extend the converter to the location of the dvd drive? that way, your extending it before the voltage regulator, so the dvd drive can get the full power without a problem..
    I dont have room for the converter....any thoughts?

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    MySQL Error soundman98's Avatar
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    what model converter are you using?

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    Quote Originally Posted by soundman98 View Post
    what model converter are you using?
    HQ converter its PSP suitable too.

    Its a 12 V to 5 V dc dc with car lighter socket

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    MySQL Error soundman98's Avatar
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    the only reason i ask is because member Oldspark pointed a site out a while back that makes a very small converter that might work for you to put near the dvd drive:

    http://www.lightobject.com/DC-to-DC-...V-2A-P540.aspx

    at only 50mm X 40mm footprint, it is really small, and should do 2A (though it might need a heat sink)




    anyways..

    technically, 30-40cm should be ok for extending the wire, though i am a little concerned because you need the maximum amperage that the psu puts out-- so any little drop will directly affect the device..

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    Disconnect the converter's sense point and extend that to the the load.

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    Quote Originally Posted by OldSpark View Post
    Disconnect the converter's sense point and extend that to the the load.
    What is sense point ??

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    Switched-mode converters sample the output voltage to increase or decrease (regulate) their output.

    It is usually a resistive (voltage) divide at the output.
    EG - the converter circuit's (IC or chip's) may have an internal reference voltage of 1.2V. For a 5V output, make 5V look like 1.2V - ie, a 1.2:5 divider - eg, a 3.8k & 1.2k resistor (see Wiki - voltage or resistive divider).

    Rather than change the resistors to boost the voltage, it's better to extend them to the output. IE - disconnect the "top" resistor (to its +5V output) and use a wire from its "top" to the load +5V. A thin wire should be fine (it's only uA or mA), though you may have to be careful with interference....
    (It the same in principle as linear regulators, alternators etc. This "extended" sense line is equivalent to the Sense terminal of a car's regulator/alternator.)


    Reality depends on the chip (converter) being used. It may have sufficient noise filtering etc.

  10. #10
    MySQL Error soundman98's Avatar
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    ^^ great idea!! in laymans terms, you are making the power supply account for the longer power wire, instead of you trying to work around it..

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