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UCC28C53: Max duty cycle variation device

Nam, Dino
Expert 6445 points
Part Number: UCC28C53
Other Parts Discussed in Thread: UCC28C55

Tool/software:

Dear team, 

My customer would like to use UCC28C53 for their application. 

As we can see like below, UCC28C53 with 100% duty and UCC28C55 with 50% max duty. 

My customer ask why there is 50% max duty device, Can 100% max duty device cover max 50% duty device? 

Which application should have which duty spec device? 

Please let me know the pros and cons of using 100% duty device and using 50% duty device.

Thank you. 

  • +1
    TI__Guru 73905 points

    Hi,

    No pros and cons, it depends your design needs more than 50% duty cycle or not. If your design needs max duty cycle not more than 50%, then use a device with max 50% duty cycle can help avoid entering > 50%, which would need to add current slope compensation. But if your design needs max duty cycle > 50%, then you have to use a device with max 100%, then a current slope compensation is required to add in.