I am working with LT8708 development board DC2596A, for Battery charging application. I was able to get CC-CV characteristics required for Battery Charging on Electronic Load. While observing the Vgs and Vds waveforms of the all the four MOSFETS, M2 and M4 were switching as per ZVS but M1 and M3 didnt have ZVS.
Output Loading condition : 1. 42V 7A (Buck Mode in Constant Charging) 2. 63V 6A (Buck Boost Mode, when battery charging enters CV Region)
I have changed the Gate resistor for all 4 MOSFETs =4.7ohms
Request you to help out, why M1 and M3 are not having ZVS?
Please find the attached Image: