While reading schematics diagrams from several switch mode power supplies of LCD TVs, I noticed that the pin which delivers the PWM pulse to the gate of a MOSFET has a diode and resistor in parallel.
Some diagrams don't have it. But there are lot of which they have it. I guess it's some protection to the driver to the IC controller.
Although I'm not sure. In first diagram there are diode and resistor in parallel, and in second there is not.