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Transformer for SMPS

Transformer for SMPS

Transformer for SMPS

(OP)
I have tried to make a transformer for my SMPS for a while, but all of these tend to saturate.  I saw my distributor carries standard toroid transformers for the use with 115 or 230 VAC.  I was wondering if I could use a 50VA backwards, of course with the proper winding ratio.  If I could do this, will a 50VA be suitable for switching 40A at 12v with a 100kHz DC-DC controller?

Thank You,
JJMI

RE: Transformer for SMPS

Suggestion: It depends. The consumption of DC-DC controller should be obtained first. Any additional foreseeable load should be added. Some design margin should be added, e.g. 15%.

RE: Transformer for SMPS

Hi there,
  Why don't you try using a ferrite core from an old television.  You can't use a standard iron core to make your transformer at those frequencies.(ie hysteresis)
I built a PWM DC to DC power supply back in college using a ferrite core out of a TV, it worked very well.

              Good luck

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