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TLC5947: What is the purpose of the Zener diode in the P-MOS line scan circuit?

Prodigy 30 points

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Part Number: TLC5947

Hi, 

  I want to design a  LED matrix by using TLC5947 24-CH LED driver in 3.3V.

But I don't know what is the purpose of the Zener diode in the P-MOS line scan circuit?

And how to decide the Zener spec according to different VLED? which in my case is 3.3V

Thank you~

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