Hey all,
For mode 4 where1 input controls 1 full bridge and the another input controls the other full bridge.
So, in this mode, PWMA will control A and B bridge, and PWMC will control C and D bridge.
Page 14 states the following:
“For example, when PWM_A is high, high side FET in half bridge A and low side FET in half bridge B will be on and low side FET in half bridge A and high side FET in half bridge B will be off.”
Questions:
If PWMA goes low, how does the switch turn off and on?
I'm assuming that if PWMA goes low, high side FET in half bridge A and low side FET in half bridge B will be turn off, there will be some dead time, and then high side FET in half bridge A and low side FET in half bridge B will turn on. This would be a "hard switching" type configuration correct.
I just want to be sure there isn't some other "soft-switching" type algorithm where maybe at first both the high side FET A and High side FET B turn off similar to maybe what a phase-shifted full-bridge waveforms would look like.
This information will help determine whether to use this device or not. I hope to get a response today.
Thanks,
John Stevens
Field Applications Team Lead