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DIY variable voltage power supply

A

AC/DCdude17

Jan 1, 1970
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The typical variable voltage power supply consist of a voltage control
IC and multiple high power transisors such as 2N3055.

The problem with this design is that it's highly inefficient and
requires large power supply for the input.

I'd like a design that can use a 12A ish 24V switch mode power supply
for input and output stage made of PWM voltage controller much like CPU
voltage controller that can drive external MOSFETs.

Is there such thing as one chip controller that will drive MOSFETs and
change output voltage from potentiometer input?
 
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