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SN74LVC244A: Output is abnormal

Part Number: SN74LVC244A

Dear Expert 


Customers use SN74LVC244A as Buffer and protection function.VCC 3.3 V.The input signal comes from the MCU and outputs to the driver MIC4424 to drive the MOS .

The function of the whole circuit is to make a Buck circuit.Input 50V, output 42V, 5A.

The schematic diagram is as follows:

The output goes from a load to no load electronically and the output waveform is inconsistent with the input waveform.The oscilloscope graph is as follows:

CH2: Buck-drl CH3: Buck-h CH4: Buck-l CH5: Buck-h1 CH8: Buck-l CH3: Buck-h CH4: Buck-l CH5: Buck-h1 CH8: Buck-L(logic output) CH7 :Inductor L4 current