Hi All,
The R10 which parallel with Q1's Gate and source thermal, I'm learning its purpose is discharge Cgs during Q1 turn off. Just curious, why it connect with R11 rather than with SW? Any one can explanation? Tks.
Regards,
Xiaobing (Eric)
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Hi All,
The R10 which parallel with Q1's Gate and source thermal, I'm learning its purpose is discharge Cgs during Q1 turn off. Just curious, why it connect with R11 rather than with SW? Any one can explanation? Tks.
Regards,
Xiaobing (Eric)
Xiaobing,
Actually you can do either way - have R10 tied from gate to source or from gate to switching node. The only difference is if you tied R10 from gate to source, the discharging current won't affect current sense.
Regards,
Sheng-Yang Yu
Hi Eric,
In the case the current sense limit is set to be so low and you are not using a controller with a leading edge blanking, you will not want to have the discharge resistor tied from gate to ground with a current sensing resistor in series with the MOSFET source to ground. You might trigger the controller's current limit and mess up the peak current control with the MOSFET driving current.
Regards,
Sheng-Yang Yu