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The function of the clamp circuit in DC/DC converter

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chang830

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Hi,
I noticed a lot of DC/DC converter(Buck and booset converter) have a clamp voltage at the output of the error amplifier.

I wonder why this clamp circuit is necessary? Is there any speciall considerations?

I found when I added this clamp block, the gain of my error amplifier is decrased a lot(from 55dB down to 25dB). What the priciples should I set the the clamp output?

Thanks
 

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