I've often wondered this but never followed up.
Take a 12v supply (not car for argument sake) drop the voltage down to say 3 volts, obviously there's going to be a lot of heat dissipation, so you use PWM... But what's the logical steps of converting 12v > 3v..
12v > pwm, but that's going to give 0>12v>0v how do you get 3volts from 12volts using pwm? what's the process? put a linear voltage regulator coupled with a big capacitor? I don't need a circuit just what's involved to get 12v>3v using pwm... I can understand LED's because you could simply use a resistor to control the current, but what about a regulated 3v supply?
Take a 12v supply (not car for argument sake) drop the voltage down to say 3 volts, obviously there's going to be a lot of heat dissipation, so you use PWM... But what's the logical steps of converting 12v > 3v..
12v > pwm, but that's going to give 0>12v>0v how do you get 3volts from 12volts using pwm? what's the process? put a linear voltage regulator coupled with a big capacitor? I don't need a circuit just what's involved to get 12v>3v using pwm... I can understand LED's because you could simply use a resistor to control the current, but what about a regulated 3v supply?