Tool/software: Code Composer Studio
Dear All:
We use boost topology to design our product by using UCD3138 and using High side SR to replace diode for higher efficiency.
We use the IDE_KD register to control the turn-on duty of the high side MOSFET. ( Db = Da * KD)
When Vin=72V, set Db=Da*9.
When Vin=40V, set Db=Da*1.
When I change Vin from 70Vdc to 40Vdc, kd will switch from 9 to 1.
At this moment, we find high side SR have shoot through problem.
CH2 ( cyan ) : DPWM1B（UCD3138 pin）
CH3 ( red )：DPWM1A（UCD3138 pin）
If I set Db=Da*5 when Vin=72V and change kd from 5 to 1 and this problem will not happen again.
Could you give me some idea about this?
