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EMB1499Q: How about using snubber ckt to eliminate parasitic oscillator in switching node?

John11513
Expert 5720 points
Part Number: EMB1499Q

Hi experts:

I observed high amplitude parasitic oscillator in switching node of EMB1499Q DC/DC circuit. Say the drain node of primary side active clamp PMOSFET, and the drain mode of secondary side synchronous rectifier MOSFET. That results PMOS is very hot and the zener diode (on secondary side) frequently damaged, and also i am afraid that oscillator will result high EMI. So I am considering adding some snubber ckt on those switching nodes. The test result is good, the parasitic oscillator is removed. I am wondered is there any potential problem to: 1. add snubber ckt on drain of PMOSFET, 2. replace clamp and zener diode (Dclamp and Zener) with a R/C snubber circuit?

Thank you!

John 

  • 0
    TI__Genius 17370 points

    Hi John,

    I dont think I see an issue here if you performed testing to confirm operation was compromised but we have limited experience with this device outside of our reference design so I cant necessarily recommend this persay. Typically adding filter/clamps for EMI reasons would be acceptable as needed to add however. Reach out to me via email if you have further concerns.

    Regards,

    Taylor