A Lead Acid battery with a nominal voltage of 18V (input range 12.2V to 14.46V) is used to
supply a 65V telephone system with a current of 0.5A. Design a DC-DC converter circuit using a
transistor, diode, inductor and a capacitor for this application. The switching frequency is
30kHz. The maximum allowable output ripple voltage is 0.4Vp-p
(a) Draw the circuit design.
(b) Calculate the approximate duty cycles if continuous conduction mode is achieved.
(c) What is the minimum inductance to keep the converter in continuous conduction mode.
(d) Calculate the output capacitor value required for this load specification.
(e) Calculate the minimum and maximum on-times for the transistor.