UCC28220: UCC28220

forget to upload  the pic

Hello,

First, From the 2V7002L, I don't think it has a hundreds uA drain-source leakage current when maximum voltage of SS pin is 4V and Vgs = 0V. 

What is your test condition and measure method?

Besides, The gate resister R182 is too large, please use a small gate resister or just a 0 ohm resister.  What is the purpose of R185? I think it is not necessary, it will lower the speed of disabling.

Last, my suggests are:

1. Use another small signal MOSFET with a smaller drain-source leakage current.

2. Increase the charging and discharging current of SS pin through increasing RCHG.

3. And increase the cooling capacity for 2V7002L, since high temperature, larger drain-source leakage current.

Regards,

Teng

Hi TENG

Increase the charging and discharging current of SS pin is a good idea, but the RCHG is related to the max duty and the frequency.  

Hello,

Yes, but may you reply my other questions in my last response? How did you measure drain-source leakage current?

Thanks,
Teng