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MaXiZ 12th July 2003 12:40 PM

A small help on a SMPS
I've build all the circuit my problem is on the transformer...
I've "destroyed" a burned transformer for 220AC to 12VDC (B) and naturally rewinded the "spin(??)". But with a tester i've at the output +6 instead of -37 and +20 instead of +37... The question's are:
1)Wrong type of winding? Should i rewind as a type A or B for this kind of application?

2)Is it suitable for this kind of application? Or MUST i use a type-A transformer?

3)Is it adaptable for this kind of application? For example by cutting the plastic fins(swings? Divider? i don't know the right word sorry! :P)

4)The buz11 become ver very hot. Don't checked but i think around 60C.. Is it normal?

Any comment will b very appreciated.. remember that i'm a beginner so don't talk much difficult! :)

MaXiZ 13th July 2003 10:11 AM

additional info
sorry the image which i refer is this...

weinstro 19th July 2003 06:24 AM

SMPS response
It's not clear from the diagrams you've posted, how you're intending to use the transformer.

I'll assume that the SG3524 is going to either switch a power MOSFET, or switch the transformer coils directly. In the latter case, you won't get a whole lot of power out of this.

In either case, this might be using the wrong type of transformer. Normally, SMPS are switched at very high frequencies, >20kHz. At these frequencies, iron lamination based transformers don't work well, and typically ceramics or ferrites are used.

The websites of and are great websites with sufficient design and app notes to get you going.

Good luck,

Rob Weinstock

Hi Speed 1st August 2003 01:00 PM

Hi maxiz

maybe the next link help you

Hi speed:)

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