cupoftea
Advanced Member level 5
Hi,
What value of CRSS do you take for calculating switch ON time of a Boost PFC, when the inductor current at switch_ON is 6A, and the FET is STW6N95K5? Vout is 390VDC.
Now, Page 9 of Lazlo Balogh……
Laszlo Balogh:
http://www.radio-sensors.se/download/gate-driver2.pdf
….gives the switch_ON time as being the sum of “t2” and “t3”…
Where t3 = CRSS * VDSoff/IG3 (page 9)
What value do you take for CRSS? (As you know, “CRSS” is obviously “CGD”)
Now, Page 4 of Balogh gives: CGD(equiv) = (1 + gfs * RL) * CGD
…..though what is “RL”?
….Presumably its "390V/6A" in this case?
I am taking gfs for this FET as 1.
STW6N95K5 FET datasheet
What value of CRSS do you take for calculating switch ON time of a Boost PFC, when the inductor current at switch_ON is 6A, and the FET is STW6N95K5? Vout is 390VDC.
Now, Page 9 of Lazlo Balogh……
Laszlo Balogh:
http://www.radio-sensors.se/download/gate-driver2.pdf
….gives the switch_ON time as being the sum of “t2” and “t3”…
Where t3 = CRSS * VDSoff/IG3 (page 9)
What value do you take for CRSS? (As you know, “CRSS” is obviously “CGD”)
Now, Page 4 of Balogh gives: CGD(equiv) = (1 + gfs * RL) * CGD
…..though what is “RL”?
….Presumably its "390V/6A" in this case?
I am taking gfs for this FET as 1.
STW6N95K5 FET datasheet