SMPS troubleshooting

Loial · 26th July 2005, 06:12 AM

Hi again
I need a little help from someone who knows SMPS...
I've got a small 24 VDC/3.3VDC converter, and i think the regulation is out of order... I'm attaching how the pulsewave and FB-voltage looked like on the PWM-circuit before it died on me.
( forgive my bad painting skills :-) )

And does anyone know any forum about SMPS only?

tekman · 4th August 2005, 11:57 AM

Did you already look in sci.electronics.design?
A couple of SMPS guru are there

hth,
Andreas

Eva · 5th August 2005, 02:31 AM

Could you describe your circuit in detail or post an schematic? There is by far not enough information in your post in order to help you, and your picture shows just RF undamped diode-transformer ringing that gets radiated everywhere.

Loial · 5th August 2005, 07:37 AM

looks like i solved this one...

the secondary winding was open, resulting in no current flow, just a ring on the feedback.

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4th August 2005, 11:57 AM	#2
tekman diyAudio Member Join Date: Oct 2004	Did you already look in sci.electronics.design? A couple of SMPS guru are there hth, Andreas

5th August 2005, 02:31 AM	#3
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Could you describe your circuit in detail or post an schematic? There is by far not enough information in your post in order to help you, and your picture shows just RF undamped diode-transformer ringing that gets radiated everywhere.

5th August 2005, 07:37 AM	#4
Loial diyAudio Member Join Date: Nov 2004 Location: Gävle	looks like i solved this one... the secondary winding was open, resulting in no current flow, just a ring on the feedback.