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Old 10th April 2004, 06:23 AM   #1
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Question Paralleling voltage regulators?

I need 5V with lots of current (5A+) for a project I'm working on. I have easy access to 5V, 3A regulators (got a couple floating around in the house), I was wondering whether I could put a couple of them in parallel in order to achieve the desired current.
Can it be done? Which extra components (if any) do I need to add?
I'd really like to stay away from more complex schematics if anywhere possible...
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Old 10th April 2004, 06:37 AM   #2
sam9 is offline sam9  United States
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Yes but don't simply tie them together. Put a small value 5W resistor on each output lest one regulator tends to do all the work. I've done this with adjustable regulators at much higher voltages.

Better still, if you can find a copy of Joseph J carrs's book "DC Poer Supplies", I think that will show an even better way to do this.
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Old 10th April 2004, 11:32 AM   #3
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Use a pass transistor to increase the current it can take...if u really need a hell lotta current...configure the 7805 (I'm guessing here) to be a small SMPSU thingy...just add in a few parts and inductor and u're set...
Kids in the back seat cause accidents...Accidents in the back seat cause kids...
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Old 10th April 2004, 09:45 PM   #4
cpemma is offline cpemma  United Kingdom
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Cheap & cheerful way is to use a 7805 with a diode between ground pin & ground to get 5.7V, then apply that to the base of an NPN power transistor connected as an emitter-follower (load between emitter and ground).

There are better-protected ways of using a pass transistor, look in the 317T datasheet for examples or there's one here.
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Old 14th April 2004, 04:01 PM   #5
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I have asked about this before.

I used a pass transistor as described.

See here:
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
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