Inexpensive DC-DC converter/SMPS design idea and suitable topologies

Tony Stewart said:

He must have made flybacks beforehand

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Tony Stewart said:

Simple does not get you great

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ronsimpson said:

No. He as this same question on at least two forums. It appears he has no experience. Link to All About Ele.

Complex = will not happen.
Simple = maybe he can get it done. With help from everyone.

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ronsimpson said:

Here is an example. TI You will need to remove the PFC part of the design. I think it is only 150 watt.

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ronsimpson said:

He needs simple. This project is too much for the first one. It is way beyond his skill set. One option is this circuit to make 24V and then add two simple buck circuits to get 12 and 5.
View attachment 134508View attachment 134510View attachment 134511
Hi Tony, If you want to teach him how the below circuit works go ahead. Neither of us are getting paid to teach today. Choose a simple option.
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ronsimpson said:

You need some tools and a chance to play with a circuit.
Here is a 400VDC to 24V isolated flyback. Not what you want but a start.
Attached is a file. Down load LTSPICE and put it on your computer. Then open my file.
You should see the schematic. Click on "run" and wait for a while. Click on the output voltage. It will take 150mS for it to start and make voltage.
This is a good place to learn how things work and what happens when changes are made.
Save the schematic to a different name before making changes so you can get back.

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Red trace is the voltage on M1.
Good luck
RonSimpson

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MD MUBDIUL HASAN said:

How did you become good engineer without homework ? Did you climb top of the tree in the first day?

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