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UCC2897A: UCC2897A switching frequence noise

Part Number: UCC2897A

Dear Team,

客戶先前CMOV fail 我們已嘗試過很多方式(change Lane x’fmr, comm choke at PD input and add RCD snubber)去壓制UCC2897A 的switching noise (202KHz)但都無法pass

目前測試EMC conducted Emissions 不論在PD port, PSE port or DCin 都被此switching noise 干擾

請問有甚麼方法可以抑制UCC2897A switching noise 到處干擾呢? 謝謝!

 

客戶也移除7 port 的common mode choke, 另一port 用飛線連接common mode choke 到板子上.

測試CMOV 並無得到很大的成效, 還有其降低switching noise 的方法嗎?

 

CH1 U23 VDS

CH2 U23 VGS

CH4 VCC5V

Many Thanks,

Jimmy