Hi Yukio Oyama san, From system level we should also analyze the cost of the isolators. Isolation would either move to the communication or to the gate driver/feedback sensors. Since we have both the C28x and CLA, one of them can run the PFC and another the LLC. In this case both controllers can run independently. It might also be possible to combine both PFC and LLC in one C28x, in this case we need to ensure that the ISRs for both are synchronous and get completed within the time available for calculation. Does your system also need to do other housekeeping, communication tasks - some bandwidth would need to be reserved for this as well. May I ask the power levels, is it 3 phase input? Which topology do you plan for the PFC and isolated DC/DC? Also, I would recommend the latest device TMS320F28P550SJ data sheet, product information and support | TI.com which will provide a clock frequency of 150MHz. Best regards, Pawan
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