i am designing a modified square wave inverter. i am using SG3524 as my pulse width modulator. i desired to have 25% duty cycle... i know my period T is the inverse of my frequency which is 50Hz so my period is 20ms. i discovered that for me to get a complete output waveform, the switching process will go through four stages in which i will share my period in 4 making 5ms per each stage. My challenge is how to get my parameters right for the pulse width modulator to give me the desired result in terms getting the values for the timing i.e the formula to apply to get the ON time which is 5ms. here is the diagram of the modulator. how do i calculate for pin 6 and pin 7 which my RT and CT respectively.