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Alternative fet driver

Discussion in 'General Electronics Discussion' started by richardb, Jan 2, 2014.

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  1. richardb

    richardb

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    0
    Dec 21, 2013
    I've been using a FAN73832MX half bridge fet driver for a few things but it has some limitations when driving anyware near 100% duty cycle does anyone know of a similar alternative that's better? I only need it to work at upto 48v.

    I'm running near 200KHz which is probably why its so bad at high duty cycles. Otherwise it's quite a good chip when working with a pic pwm output


    any ideas?

    Rich
     
  2. jpanhalt

    jpanhalt

    426
    4
    Nov 12, 2013
    Isn't 100% duty cycle a problem for all bootstrap drives? Moreover, as you surmise, the high frequency probably adds to the problem.

    Just found a driver that kicks in a charge pump to allow 100% duty cycle. I didn't read the whole datasheet, but I suspect similar devices are becoming increasing available to try to get that last percent of power:

    http://www.allegromicro.com/en/Prod...ace-ICs/Brushless-DC-Motor-Drivers/A3946.aspx

    John
     
  3. richardb

    richardb

    48
    0
    Dec 21, 2013
    yes if they are purely bootstrap.

    I should have added that I have used hip4081 drivers which are excellent but a bit large and pricy.

    i'll have to see if I can find some more info on that part.although at 16 or so pins its already looking less atractive
     
  4. jpanhalt

    jpanhalt

    426
    4
    Nov 12, 2013
    I would certainly give TI/Fairchild another search. That Allegro part is just the first one that popped up when I searched on charge-pump driver.

    John
     
  5. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    International rectifier do several devices.
    Thanks Adam-
     
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