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Old 27th August 2005, 04:45 PM   #21
blmn is offline blmn  Brazil
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Crissty,

In many old National Power Databooks you can find step-down switching regulators using linear ICs like LM317/337.

I think it would be the solution for you.

Regards,
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Old 1st September 2005, 05:50 AM   #22
crissty is offline crissty  Greenland
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I could not make up last whole week, quite busy. But i have made the circuit layout on a sheet of paper, and just wanna get the parts & assemble.

By the way i am gonna go for 30Khz Switching frequency using SG3525, which would not be critical, as far as PCB layout is concerned


Quote:
In many old National Power Databooks you can find step-down switching regulators using linear ICs like LM317/337.
blmn,
I know that but as i said earlier those are lenear regulators, I am planning for SMPS type regulator, for higher efficiency & lower Heating + Smaller Heatsink requirement.
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Old 1st September 2005, 06:18 AM   #23
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Quote:
Originally posted by crissty
I could not make up last whole week, quite busy. But i have made the circuit layout on a sheet of paper, and just wanna get the parts & assemble.

By the way i am gonna go for 30Khz Switching frequency using SG3525, which would not be critical, as far as PCB layout is concerned



blmn,
I know that but as i said earlier those are lenear regulators, I am planning for SMPS type regulator, for higher efficiency & lower Heating + Smaller Heatsink requirement.

I think you misread him. Those supplies blmn mentioned ARE SMPS, but they use linear chips (317) as the switching elements. Those supplies have all the advantages (and disadvantages, of course) of SMPS.

Jan Didden
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Old 2nd September 2005, 04:18 AM   #24
blmn is offline blmn  Brazil
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Jan,

Sometimes I thinking Im getting old...

Crissty,

Under tons of dust I found something that might be interesting.

See below two of these circuits.

Best regards,
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File Type: jpg smpslm317.jpg (55.9 KB, 233 views)
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