230VAC to 5VDC 2A SMPS power supply design needed. - diyAudio
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Old 18th June 2010, 08:12 AM   #1
Wynand is offline Wynand  South Africa
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Default 230VAC to 5VDC 2A SMPS power supply design needed.

Hi guys, I need to make a power supply that can do 5v 2-3A powered from 230VAC. This needs to be a small psu so it would probably have to be a smps design.

It's to power a GPRS module and ethernet controller.

Does anyone know of a reference design or design I could use?

Thanks for any help in the matter.

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Old 18th June 2010, 09:51 AM   #2
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Standard fare in most flyback controller chip appnotes. There should be one in UC3842 appnotes.

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Old 19th June 2010, 10:23 PM   #3
gootee is offline gootee  United States
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There should be plenty of application notes and reference designs for that at places like linear.com, and maybe national.com, among many others.
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Old 21st June 2010, 04:19 PM   #4
star882 is offline star882  United States
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Off-the-shelf modules are commonly available for that specification.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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Old 21st June 2010, 04:27 PM   #5
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Originally Posted by star882 View Post
Off-the-shelf modules are commonly available for that specification.
Yes, I recently bought a 5V 4A brick - size 10cm * 6cm * 2.5cm for 35RMB (under $6 even with the recent Yuan revaluation). Can't see how it could possibly be worthwhile to build your own unless you have some particularly stringent noise spec for instance.
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
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