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UCC28C42: UCC28C42 Ocillation frequency under light load

Part Number: UCC28C42

Question 1
I think that it basically oscillates at a fixed frequency, but may it oscillate intermittently or reduce the frequency when the load is light?

Question 2
If the frequency is reduced or intermittent oscillation is answered in Question 1, would you please teach me if the minimum oscillation frequency is determined by design?