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short circuit condition noise

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happy2005

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Hi All,

I hv designed a 24V/10A offline current mode forward converter using 384x. I designed a compensation circuit, and it works good whole operating range. But in short circuit condition when output voltage drops below a certain voltage, a noise sound starts in magnetic components. I couldnt find why this oscillation arising from.
It looks like a buzzer in short circuit condition

Anybody have any experience about that?

Best regards,
 

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