I have designed a driver circuit using HCPL-3120.
i think i am getting the output pulses but i am not able to vary the voltage and the pulse width of the output pulses.
i am attaching the circuit dig., output voltage and input voltage...
if anyone has any idea please reply....

 

Not sure what your asking? The component is a glorified switch, it will not vary voltage and pulse width. The voltage out will always be the same as what is put into it, on pin #8. The pulse width has to be varied by the square wave signal put into it, on pin #2.