Hello! I am developing flyback 200W PSU with UCC24612-2 and TPW4R50ANH. Output is 14V 14A and working frequency 70kHz. I tested my converter with single mosfet rectifier with UCC24612-2 and result was good. Trying to adjust power dissipation on SR mosfet i added another one in parallel. After that, i found that controller is not working correctly. UCC24612 was driving mosfets just for 0.5 - 0.6uS period with peak gate voltage 8-9V without proportional gate regulation. After removing 2nd mosfet IC started to work normaly.
UCC24612 connected very close to mosfet with gate loop length around 10mm and with kelvin connections to drain and source.
Rgs ~ 0
CVdd ~ 3uF
CVreg ~ 4.4uF
Vdd ~ 15..18V
Ids_peak ~ 68A
Please give me advice on what's wrong.
P.S i also tested SR with IR1161L on this board with 2 mosfets, it works without any issues
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