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TPS563206EVM: D-CAP3 Switching frequency

Part Number: TPS563206EVM


When using the EVM, when testing the switching frequency, it was found that there was an unstable switching frequency, which conforms to D-CAP3's pseudo-fixed frequency, but when I changed the loop parameters to R1=75k Vout=5V. The switching frequency was found to be almost constant. Why?