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TPS40425: SW frequency issue

Part Number: TPS40425

Hi 

My customer has question.Please cooperate me.

The specification of the customer is below.

Vin:12V
Vout:0.85V
IOUT:15~30A
→15A at the time of waveform measurement
fsw:300kHz

TPS40425_sw_waveform.pdf

The waveform is disordered without the SW frequency performing constant operation.
Do you have any advice on the cause of this phenomenon?
There is also a circuit diagram etc. I can not place it here, so if you can tell me the e-mail address etc., I will send it locally.

Best Regard

T Kishi