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TPS57160-Q1: Deviation in switching frequency

Part Number: TPS57160-Q1

Hi,

I have used 200Kohms at RT/CLK pin of TPS57160-Q1 voltage regulator. But the measurement of switching node pulse shows the time period of one cycle ~3.75us. 

Calculated Fsw = 587KHz

Measured Fsw = 267KHz

Vin = 16V to 36V

Vout configured for 5V

Could you please help to figure out the reason for this difference? I would like to know the possible causes of this issue. Could you please support for the same?