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CSD97396Q4M: the mosfet can not be opened

Part Number: CSD97396Q4M

Dear sir,

I'm using the CSD97396 to implement a buck-boost circuit. The PWM and skip is connected to a FPGA. They are 3.3V signal. The PWM frequency is 400KHz. No matter I change the signal, there is no voltage output. I cannot get any voltage on SW pin of U17 even I set pwm = 1.  The Vin is 12V in my test. R169 and R170 change to 1ohm.

Could you help to check what is the problem?