Complex sentence: Whenever trigger pulse becomes low, the ouput of icswitches to high and as a result C keeps on charging until the voltage is above input voltage.whenever the trigger pin is low output of ic switches to high and this process continues till the stream of pulses are obtained.
Split into simpler sentences: Whenever trigger pulse becomes low, the ouput of icswitches to high and as a result C keeps on charging until the voltage is above input voltage. Whenever the trigger pin is low output of IC switches to high and this process continues till the stream of pulses are obtained.