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RC filter for current sense feedback in boost SMPS

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chimi

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I have a problem with the current feedback in a boost converter using the current mode UC3845 IC, some switching is lost due to turn on noise, generating a peak at the turn on time cutting the slope for the entire cycle

The circuit already has snubbers and they work fine, but the loads for this supply are 20W to 70W, so the initial cuurent can be really big...

How is calculated a RC filter for this?? the frequency of the noise is approximately 4MHz

Thanx!!!
 
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