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DRV8703-Q1: VCP question

Part Number: DRV8703-Q1

Tool/software:

hello,

about the DRV8703-Q1,i checked Protecting automotive motor-drive systems from reverse polarity conditions Application Report

refer to the following picture , 

1)I would like to ask what is the function of D1?

2) Can I use a resistor instead of a triode Q1? 

Thank you

best regards