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Triac triggering circuit with a positive power supply

Question asked by Maher.Ahmed on Dec 1, 2016
Latest reply on Dec 6, 2016 by Maher.Ahmed
After reading AN3168 I found a paragraph that I do not actually understand and seemed weird for me . 

Page 8, "With the bipolar solution, to keep the current sourced to the gate, the only way is then to use a PNP transistor."

Do you have any explanation for this sentence please ?
And what is the consequence of using NPN instead ?

Thanks in advance.