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UCC28180: UCC28180 CCM BOOST PFC

Sonu Jayachandran
Prodigy 140 points
Part Number: UCC28180

Hi,

I am building a 1.6kW CCM Boost PFC using UCC28180 Controller. Now I am gradually increasing the input voltage to power circuit from 0-230V and then turning on auxiliary supply to the controller. I am not using any pre-charge Diode in Boost circuit. If I put a precharge diode, Can I directly connect the circuit to a 230V socket and turn on everything at once?  Will the UCC28180 controller will be able to stabilize the initial transient?

  • 0
    TI__Mastermind 34465 points
    Hello Sonu Jayachandran,
    There is no benefit in not using a bypass diode across the inductor for any test situation or in an application.
    This diode allows your pfc to boost your output voltage from an initial value equal to the input voltage.
    The benefit of the bypass diode is a reduced start up stress on the MOSFET and less chance of an overshoot.
    If your circuit is properly designed then you can apply 230V directly to the input and there will be no overshoot.

    Regards
    John
  • 0 in reply to John Griffin1
    Prodigy 140 points

    Thank you, John. So I can directly operate on 230V if I am properly designing the UCC28180 control circuit, PFC shutdown circuit, Current limit resistor bypass circuit as given by reference design. Right??

    Also for the 1.6kW circuit that I designed efficiency is less than 90%. My switching frequency is 100kHz.  Is the efficiency solely affected by the conduction losses of components that I am using or does the control circuit have to do anything with efficiency.