Hi,
I'm developing board based on UCC256403, in order to well understand the operation. I dowload the simulation model of "CC25640x Simplis Model" from web. It work well as original setup of 380V in 24v vout.
But our design is 380V in and 60v out, I updated the Lr, Lp, Cn and turn ration as what our board as. But the simulation result is not right. The vout value is not right. How can I revise the model to simulate my design? What's parameter set need to update?
Best Regards,
Kong
Hello Manikanta,
The model work fine, thanks.
Another question, below is the waveform of load=4.2A and 6.7A. CH1=low side gate Vgs, CH2=high side gate Vgs. CH3=Lr current.CH4=SW.
For 4.2A, the circuit work well but in heavy load of 6.7A, seem Lr current is not large enough to put high side MOSFET to ZVS. Then how to solve it? By decrease the Lm or increase the deadtime?
Best Regards,
Kong
Hello Manikanta,
The high site MOSFET ZVS is ok now. But the SW duty cycle is not 50% at heavy load. It's seemed the current spike after high site MOSFET turned off cause it. Do you know why and does the duty cycle of not 50% cause any other issue?
Best Regards,
Kong
