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Discussion Starter #1 (Edited)
Does anyone have a link or schematic for a DC-DC converter, i.e. buck converter, with around a 200-400VDC input and 12VDC output that they would care to share? Many thanks! Just to note I am looking to build one myself not purchase one off the shelf. I'd like the schematic so I can run it in Pspice to see its output.
 

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Hey there. I recognize your intention and understand you want to build your own DC/DC converter. However, if your main motivation is economy, you should look into AC/DC switching power supplies which are plentiful on eBay and other sites. For about $50 you can have a power supply that will take ~125 to 340VDC and give you an isolated 12V @ 25A. With a little work you might be able to modify a PC power supply. I was looking at one today for about $40 that will do 12V at 38A and you get a fan plus 3.3V and 5V rails. Not bad.

JR
 

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If you're interested VICOR makes some great DC-DC converter modules. I bought some VI-251-09 modules on ebay for about $29 each. The 09 is a special production which is rated at 150-250 volt input and 12v out at 200 watts. I adjusted the output to 13.6 v and they can be paralleled nicely.
 

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Seeing how these work in spice is fun. Building one can be a pain because as a home tinker most/all your Boost and Buck chips need to be surface mount. However... some of the more popular chips have demo kits you can get for a few bucks.

That being said. Try any of these venders and find one that has pspice for the controller you want. Their app notes come with basic schematics to get you going for you model.

Linear Tech - http://www.linear.com/pc/viewCategory.jsp?navId=H0,C1,C1003,C1042&gclid=CNDd4rzg1aQCFUxj7AodLSkRKg
Ti - http://www.ti.com/corp/docs/landing/tps40140/index.htm?DCMP=A_Power_Power_Power&CMP=KNC-GoogleTI&247SEM
National semi - http://www.national.com/cat/index.cgi?i=i//317

Keep in mind... What ever you spice will not work that way in the real world... High speed DC2DC converters can be greatly impacted by board layout.

Anyway you get the idea, lots of vender's out there. I'd send you a schematic if I had access to any.. Sadly I don't do any real work anymore (MGT) :eek:


Good luck





Does anyone have a link or schematic for a DC-DC converter, i.e. buck converter, with around a 200-400VDC input and 12VDC output that they would care to share? Many thanks! Just to note I am looking to build one myself not purchase one off the shelf. I'd like the schematic so I can run it in Pspice to see its output.
 
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