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LM34927: switching frequency

Mia Ma
Intellectual 2395 points
Part Number: LM34927

Hi team, 

For our LM34927, we have a confusing item.

We have description that our switching frequency is relatively constant with line regulation and have following formula.

However, when we run a simulation, the frequency do change when we change the Vin, how to understand this.

LM34927_buck_Vout6V.tsc

Thanks

Best regards

Mia