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In Reply to: RE: Power supply design for low power PC posted by mschneider on January 4, 2009 at 08:36:40:
Hi Mark,
you can certainly run two regulators off the same raw supply, you just have a lot more voltage drop for the 5V reg so the heatsink will have to be bigger.
The design shown is good for a max of about 2A. So if the combination of the 12V and 5V is less than 2A you can do it.
For 12V you want to use the VPS36-1200 transformer with the secondaries in paralel. Thats one will be right on the edge for 2A, if you do need 2A I'd go with the VPS36-2200.
If you need more than 2A total you have two choices, make 2 supplies, or I can design you a higher current version. Or if the current will be a lot less let me know as well. This design was optimized for the 1 to 1.5A range. It will work well up to about 2A, and it will work as well at lower currents but it will not be optimized. For example if you know you anly need a combined total of 200mA I can design a supply optimized for that.
John S.
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Follow Ups
- RE: Power supply design for low power PC - John Swenson 01/4/0913:28:14 01/4/09 (1)
- RE: Power supply design for low power PC - mschneider 08:11:50 01/5/09 (0)
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