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UCC28180: can pin4 FREQ be used as CLK sync?

Max Han
Intellectual 2260 points
Part Number: UCC28180
Other Parts Discussed in Thread: UCC28070

Hi 

UCC28180 frequency accuracy is not met customer's requirement, customer want to know if pin4 FREQ can be used as CLK sync?

if yes, customer can get a high frequency accuracy.

now, customer use 17.8k resisitor, they designed several power modules, most frequency is around 115kHz, but 1 power module frequency is 130kHz.

I check datasheet, this frequency is not very high accuracy.

thanks.

  • 0
    TI__Mastermind 34465 points

    Hello Max,

    Unfortunately the UCC28180 does not have a provision for external synchronisation of the internal oscillator.

    The UCC28070 is an interleaved CCM pfc controller and this can be synchronised so that multiple power modules can accurately deliverthe full load power.

    Regards

    John