PWM output voltage ranges very low for the model "ADC-PWM Synchronization via ADC Interrupt "

Hello,

Atleast I have tried ADC-PWM Synchronization via ADC Interrupt with C2000 explorer kit and am getting the PWM signal at epwm1A. But am getting voltage range of 1mV to 1.6 Volts on varying the VR1. why is it so ? why not Board reference voltage 3.3V ? And muchmore to get 0-5v range from PWM, do i suppose to add-on anything to the simulink model ? Anyhelp would be greatly appreciated. Thanks, Nethaji D