UC2825: uc2825

Hi harsha s r,
To generate a duty cycle you will need to have a capacitor connected between the CT pin and GND and a resistor connected between the RT pin and GND. The Ramp pin must be connected to CT so that you have a triangle wave on the non-inverting input of the comparator.
The duty cycle will now be controlled by the voltage level on the E/A Out pin. The EA Out voltage can be adjusted using the Open Loop Laboratory Test Fixture shown on page 8 of the datasheet.
Thanks
Joe Leisten