Multi Output Flyback Converter - Electronic Circuits Projects Diagrams Free

Babu Krishnan · 13th March 2008, 08:54 PM

Hi,
I'm doing a project on Designing MultiOutput SMPS.
I chose Flyback to be operated in DCM mode. With the following Spec.
Input : 85 - 265 AC
Output: 5V/10A, 12V/5A, -12V/1A & -5V/1A
Estimated Eff : 80%
Operating freq:120KHz

I managed to workout the Rectifier ckt, Filter ckts.
I'm stuck with the transformer design. I'm not sure what core to use, what MOSFET to use. I followed some design procedures (Eg. Fairchild Application Note AN4137) but they all using their own Switch-cum-Controller packages.eg FPS or TOPswitches. I want to use PWM IC UC3842 and MOSFETS(not sure which one to use) for this design.

Can someone pls help me ? I'm really running out of Time & Idea.

Hero999 · 16th March 2008, 11:24 PM

I doubt you'll be able to find a transformer off the shelf.

What's wrong with the cores suggested on the app notes?

The most commonly used MOSFET is the IRF720, why not use it?

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13th March 2008, 08:54 PM	(permalink)
Babu Krishnan	Multi Output Flyback Converter Hi, I'm doing a project on Designing MultiOutput SMPS. I chose Flyback to be operated in DCM mode. With the following Spec. Input : 85 - 265 AC Output: 5V/10A, 12V/5A, -12V/1A & -5V/1A Estimated Eff : 80% Operating freq:120KHz I managed to workout the Rectifier ckt, Filter ckts. I'm stuck with the transformer design. I'm not sure what core to use, what MOSFET to use. I followed some design procedures (Eg. Fairchild Application Note AN4137) but they all using their own Switch-cum-Controller packages.eg FPS or TOPswitches. I want to use PWM IC UC3842 and MOSFETS(not sure which one to use) for this design. Can someone pls help me ? I'm really running out of Time & Idea.

16th March 2008, 11:24 PM	(permalink)
Hero999	I doubt you'll be able to find a transformer off the shelf. What's wrong with the cores suggested on the app notes? The most commonly used MOSFET is the IRF720, why not use it? __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez