Pulse Width Modulator Transfer Function gain

Pulse Width Modulator Transfer Function (gain) 

The output of the error amplifier (sometimes called COMP, sometimes EA-out, sometimes control voltage ) is applied to one of the inputs of the pulse width modulator ( PWM ) comparator. On the other input of this comparator, we have an applied sawtooth voltage ramp — either internally generated from the clock when using voltage mode control, or derived from the current ramp when using current mode control. Thereafter, by normal comparator action, we get pulses of desired width, with which to drive the switch. 

As mentioned previously, the output of the pulse width modulator stage is duty cycle, and its input is the control voltage or the EA-out. So, as we said, the gain of this stage is not a 

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