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Original question:

UCC28750: Transformer turns ratio and magnetizing inductance

UCC28750: Kccm factor significance in flyback

Rohan Kadam
Prodigy 30 points
Part Number: UCC28750

Tool/software:

I am designing a UCC28750 based offline 60 watt , 12V , 5A Flyback converter and want to understand the significance of Kccm factor given in below equation.

if its selected as 0.5 then 30 - 60  watt of output power will be delivered in CCM mode and 0 -30 watt of power  will be delivered in DCM mode.

is this understanding correct ?

Thanks

  • 0
    TI__Guru* 86266 points

    Hello,

     

    The KCCM factor is selecting the primary magnetizing inductance where the design goes into critical conduction based on estimated efficiency.

     

    You are correct that if you select 0.5 and select the transformer magnatizing inductance for a 60 W design you design will be operating at critical conduction at 50% load power.

    This will only occur at this spot if the actual efficiency of your design matches your theoretical efficiency.

     

    Regards,