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Old 26th July 2005, 06:12 AM   #1
Loial is offline Loial  Sweden
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Default SMPS troubleshooting

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?
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File Type: gif pwm.gif (2.2 KB, 159 views)
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Old 4th August 2005, 11:57 AM   #2
tekman is offline tekman  Germany
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Did you already look in
A couple of SMPS guru are there

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Old 5th August 2005, 02:31 AM   #3
Eva is offline Eva  Spain
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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.
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Old 5th August 2005, 07:37 AM   #4
Loial is offline Loial  Sweden
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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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