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Power Supply

Power Supply

Power Supply

(OP)
Hi there!

While going through my electronics cupboard, I came across a transformer rated at 32volts/ 3.22Amp (105VA). I would like to build a variable power supply with a current limiting feature using this transformer. Unfortunately, all the regulators I came across, has a maximum input voltage of 37 volts. The output voltage of the transformer, after smoothing will be 45.28V (32v x 1.414). Clearly this is not going to work. Could you advise me on possible solutions or circuits??? Also, is pulse width modulation an option to regulate the output voltage?

RE: Power Supply

Hi, you could try a L296 switching regulator, I've used 1 for a bench power supply. You need to watch the input voltage as the 296 is rated at 46v and your transformer will give more than that off load. A descrete pre regulator, or a series zeneer diode. You will get 4A output but with an external pass transistor you can easily get 15A at 5v from it.

RE: Power Supply

Linear Technology has about a dozen switchers that take more than that input voltage.

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