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UCC28C43-Q1: Pulse Skipping/Burst mode

Part Number: UCC28C43-Q1
Other Parts Discussed in Thread: UCC28C43

Tool/software:

Hello Folks,

We are using the UCC28C43 device in a flyback application in our product and we have noticed that for a high input voltage and typical load, the controller seems to enter in a Pulse Skipping/Burst Mode. however, the voltage output is kept at rate voltage value. 

After checking the datasheet, I haven't any explanation about it, therefore i don't know if this mode is allowed or even exist in the give device. 

I would be happy to get more explanation about it?

Thank you