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UDN2981 Specs — Parallax Forums

UDN2981 Specs

DigitalDjDigitalDj Posts: 207
edited 2008-04-22 12:34 in General Discussion
Hello,

Can someone tell me what the maximum overall current of the UDN2981? I need to draw 325ma at 50% pwm duty cycle per output and want to make sure it will handle that.

Thanks,
Kevin


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Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2008-04-17 03:13
    There is a graph on pg 6 of 8, "Allowable peak collector current as a function of duty cycle", and according to it, with VS = 15V and·50% DU, you can draw 225mA from 8 gates or 325mA from 6.

    http://www.allegromicro.com/en/Products/Part_Numbers/2981/2981.pdf
  • DigitalDjDigitalDj Posts: 207
    edited 2008-04-22 01:41
    Thanks PJ seen that but wanted to make sure I was looking at it correctly.

    Kevin



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  • PJAllenPJAllen Banned Posts: 5,065
    edited 2008-04-22 12:34
    This·IC is touted as a pancea, because it's easier to "understand" than its cousin the ULN2803.· The Vsat spec is ignored.· 2V across a transistor, with 300mA going through it is 0.6W, and x8 is almost 5W.· It's just a DIP-IC, it has no heatsink.
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