adp2323 emi and snubber design

I am using the ADP2323 for one of our designs and i can see low amplitude spikes (10mVpp) at the switching frequency on some board outputs (on clock signals ). I was wondering if an RC snubber circuit at the output MOSFET could help reduce these spikes leaking into sensitive sections of the board.

I see that the ADP2323 evaluation board has provision for RC snubber (R6, C11 and R20, C14) but is not populated. Is there any reference for optimal RC values that can be calculated for APD2323 ? I would appreciate any inputs.

Thanks.

AB

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  • Thanks LucaV,

    I think the layout precautions are taken as you mentioned. But i will try to send you some snapshots of the layout. It will be tough to send the complete board layout. Is there an email ID i can use to send you the design ?

    Also i am using XFL4020-472 Coilcraft at 4.7uH. I see that an XAL series is recommended for higher Isat with minor penalty on DCR. Our continuous current draw at 5.6V is 1.5A. I can try switching to the XAL series. What would you recommend ?

    Thanks again,

    AB

Reply
  • Thanks LucaV,

    I think the layout precautions are taken as you mentioned. But i will try to send you some snapshots of the layout. It will be tough to send the complete board layout. Is there an email ID i can use to send you the design ?

    Also i am using XFL4020-472 Coilcraft at 4.7uH. I see that an XAL series is recommended for higher Isat with minor penalty on DCR. Our continuous current draw at 5.6V is 1.5A. I can try switching to the XAL series. What would you recommend ?

    Thanks again,

    AB

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