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Thread: 33mm, 25A, 35V, adjustable LED driver - fits D-cell tubes! - thermally protected

  1. #31
    Flashaholic Hoop's Avatar
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    Default Re: 33mm, 25A, 35V, adjustable LED driver - fits D-cell tubes! - thermally protected

    I understand, thanks.

    Yep, I am after the 25A version for the sr-90 mod. I also want to do a mag mod with one of these and that one should probably be 16.7A.

    Why offer versions other than the 25A one if the current limit is adjustable? Is there a downside to the 25A such as higher dropout voltage? What parts change between the variants?
    Last edited by Hoop; 03-10-2021 at 11:34 PM.

  2. #32
    Flashaholic* DIWdiver's Avatar
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    Default Re: 33mm, 25A, 35V, adjustable LED driver - fits D-cell tubes! - thermally protected

    Lower current versions have better sensitivity at low currents.

  3. #33
    Flashaholic Hoop's Avatar
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    Default Re: 33mm, 25A, 35V, adjustable LED driver - fits D-cell tubes! - thermally protected

    What type and value of thermistor do you recommend?

  4. #34
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    Default Re: 33mm, 25A, 35V, adjustable LED driver - fits D-cell tubes! - thermally protected

    10K, NTC with B=3435 (or close). After that it's whatever you can get to make good thermal contact while being electrically isolated. The one I use on the board is Vishay NTCS0805E3103HLT.

    A Vishay NTCALUG02A103FLA would be a good choice, and a little easier to work with.

  5. #35
    Flashaholic Hoop's Avatar
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    Default Re: 33mm, 25A, 35V, adjustable LED driver - fits D-cell tubes! - thermally protected

    Does the driver feature reverse voltage protection?

  6. #36
    Flashaholic* DIWdiver's Avatar
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    Default Re: 33mm, 25A, 35V, adjustable LED driver - fits D-cell tubes! - thermally protected

    No, that was not included in the design.

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