berger.h
Member level 5
Hello,
I have switching power supply for very low output power on 230V is input current 1-2mA and switching frequency 66kHz.
In design is on input EMI filer R1+R2+C1, and this ensure compliance with the EN55022 Class B emission limit.
I need to redesign it , and new design must have R2=0, I increase C1 from 2,2uF to 6,8uF and between RF1 and R1 add 10nF ceramics SMD C2 10nF.
Is it a good idea to reduce the missing R2?
Or how to better adjust the EMI filter?
Requirement, very small size (not big L on input) and low impedance on N.
I have switching power supply for very low output power on 230V is input current 1-2mA and switching frequency 66kHz.
In design is on input EMI filer R1+R2+C1, and this ensure compliance with the EN55022 Class B emission limit.
I need to redesign it , and new design must have R2=0, I increase C1 from 2,2uF to 6,8uF and between RF1 and R1 add 10nF ceramics SMD C2 10nF.
Is it a good idea to reduce the missing R2?
Or how to better adjust the EMI filter?
Requirement, very small size (not big L on input) and low impedance on N.