Other Parts Discussed in Thread: CSD18510Q5B
Hi,
I am using DRV8701E as gate driver to drive for CSD18510Q5B mosfet.
4 parallel mosfet in each arm of H bridge.So total 16 mosfet in H bridge.
I drive current source is set to 150mA and sink 300mA.
When there is 4 parallel mosfet in each arm of H -bridge then it raise fault indication but in 3 parallel mosfet it works finne.
Calculation- CSD18510Q5B
Qgd= 21nc.,
Isource= 150mA.
T(slew)= Qgd/Isource=(8*21nc)/150mA=1.12 uSec //For 8 mosfet slew time,4 on high side and 4 lower side
Average Current : IAVG = QG × # MOSFETs Switching × Switching Frequency
= 21 nc * 8 * 4Khz= 672 uA
All parameters are in range, still with 4 parallel mosfet it raises fault condition and works fine with 3 parallel mosfet.