Inverted input from UC2524 PWM chip - 2

Hi everybody,

this is my second post with the same title.

I am trying to understand how does this circuit works.
I have changed first schematic and I think that now is correct.

Can someone explain me how does it works with one NPN, PNP transistor and one MOSFET.
I think that this circuit is producing an inverted input for PWM chip. Am I wright? How does it works?

Thanks in advance
Jovan