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12127Re: [SeattleRobotics] current limit?

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  • Ned Konz
    Nov 1, 2002
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      On Friday 01 November 2002 12:43 pm, toolguy500 wrote:

      > what do i do to limit current in a circuit?
      >
      > i have about a 12v source i wanna connect to about a 1 ohm load,
      > limit to about 5A and have the supply stay around 12v.
      >
      > suggestions?

      Depends on how much efficiency you want. If you don't care about power
      or heat, you could use a linear circuit (like two power transistors
      or an LM338) to drop the 7V. But you'd be dissipating 35W of heat:
      this is more than the 25W you're putting into the load!

      Much higher efficiency would be to use a switching power supply that
      could give you 5V at that current.

      Do you really need current limiting, or just a 5V supply? That is, is
      this a resistive load where you could use a fixed voltage?

      --
      Ned Konz
      http://bike-nomad.com
      GPG key ID: BEEA7EFE
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