DC-DC Power Supply Design?

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ibnul7

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Hey guys, I am trying to build a power DC-DC power supply that converts 32VDC to 0-24VDC (or 5-24VDC) and has constant current OR current limiting+constant voltage. They have to be adjustable, and it would be preferable if it did it all with basic electronic components. I have previously tried a PWM approach with a cn555 timer circuit, but obviously the output won't be regulated. Thanks
 

Here is a simulation of a simple buck converter design. Output voltage is regulated and adjustable.

Control is done by an op amp via hysteresis.

 

Thank you very much Didn't know you can do that with a hysteresis curve
 

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