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Tools | Display Modes |
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#1 (permalink) |
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Hi
Since each LM317 volt. reg IC can supply only a maximum of 1.5amps, how could i connect 2 or more LM317 voltage reg. ICs in parallel in order to increase the current output capability at the output to supply 3-4 amps at the same variable voltage output. Thanx |
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#4 (permalink) |
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You can use current sharing resistors on the outputs, and maybe output diodes so that the regulators only source current, but then you sacrifice the low output impedance regulators provide you, in return for simplicity.
Last edited by Willbe; 16th November 2008 at 10:39 PM. |
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#7 (permalink) |
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Although a solution is already covered, hooking up two V regs in parallel is bad juju in general, as which ever is slightly biased higher, it will supply all of the current
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#8 (permalink) | |
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Quote:
Try it on paper. It's two loops with 3 resistors, one resistor being the load resistor. Assume a 0.1v difference in the IC outputs. The real problem comes if you remove the load resistor, so if this is a possibility then I recommend output diodes. Last edited by Willbe; 17th November 2008 at 04:15 PM. |
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#11 (permalink) |
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You can't get an LM338T in "does it matter?" Wow. (It's called go to Jameco or DigiKey online and order some
If you really can't get one then I'd stick with using a pass transistor on a single LM317, as previously suggested by someone...
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Go Trojans! |
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#12 (permalink) |
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Electronic Design Welcome for 11.17.08 has an article [ED online 20023] where the author, Bruhns, parallels two LT3080 regulators.
Sort of. . . |
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