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2141041_en-US
2141041_en-US
Howdy. I'm working with a client project, 27-30V, 550W designed using TEA2017 PFC and LLC.
Now originally we were using Fixed Freq 55khz for PFC and the mosfets temps were hotter than usual but still controllable via heatsinks, but now we are trying to make our PFC more efficient. Hence utilizing DCM/QR/CCM mode. Unfortunately in our design in DCM/QR/CCM mode the mosfets rapidly goes up to the failure Temps.
things we have tried but didn't work:
1: Using transistors for gate drivers to drive the pfc gate hard
2: Confirming Our switching is happening after rigning period and when the DrainPFC was falling.
3. Disabling LLC and connect load directly to Vboost to test/tune PFC (result: tea didn't switch pfc the Vboost stayed at 327V (SNSBoost at 2V))
We haven't changed much with our design or TEA settings, as we are trying to test DCM/QR/CCM. Any help/clue int he right direction will be very helpful.
I have posted the PFC part of the schematic, and CONFIG_D is what we use.
HI
1: You should confirm which component getting hot the inductor or others,then provide the heat dissipation solution.
2: You can also configure the circuit as attached excel calculate sheet then update your schematic.