Hi. I using TIDA-0792 referance design. I connected to my inverter DSG mosfert was burning. I resaarch BQ76200 mosfet driiver. My design include 5 paralel mosfet on decharge side and 5 parellel mosfet on charge side. İf ı connect to Li-ion 14s baterry pack mosfet not burning, but ı connect to LiFePO4 15 s battery to inverter DSG mosfet burning.
I think , LiFePO4 baterry of internal resistance is very smaller then li-ion batery , so I connect to inverter whic incude capacitor in dc input side push more inrush current. High inrush current passing on DSG mosfet but mosfet off time are large. then mosfet was burning.
I change bq76200 VDDCp capacitor value 10uF because parelel connection of mosfet , but not solved, Then ı try decrese C5 filter capacitor value about 100pf mosfet of time litle decrese not enaugh, Then ı try connct to dsg mosfet of gate to drain 100nF polyster capacitor mosfet on time decresed but of time not effect, ı try change dsg mosfet source to gate resistor value 10 Mohm to 1 Mohm mosfet of time decreased , but not enaugh. I changed DSG mosfet gate series resistor which not effect .
I try predischarge mosfet which litle solved my issue because if ı connect to baterry pack to inverter when pres pin is active does not effect predischarge and mosfet burning.
HOw can solve this issue?
How can calculate VDDCP capacitor value?
Is there another driver I can use?
