Hi Guys
As for the CTL Pin function, datasheet : CTL is the voltage-control loop input to the pulse-width modulator (PWM). Pulling VCTL below VZDC causes GATE to stop switching. Increasing VCTL above VZDC (0 duty cycle voltage) raises the switching MOSFET programmed peak current. The maximum (peak) current is requested at approximately VZDC + (2 × VCSMAX). The AC gain from CTL to the PWM comparator is 0.5. The internal divider from CTL to ARTN is approximately 100 kΩ.
So in my opinion, the CTL Pin is used to control the PWM pulse. It is related to the current limit. But I am confused how does this Pin work? and what is the meaning of Vzdc? or why is Vzdc? What is the condition when Vzdc is higher than Vctl or lower than Vctl? could you please explain how the CTL work ?
Any feedback are appreciated.
Thanks
-Vincent