Investigate and simulate dcdc buck regulator by using ltspice
Loading...
Date
2018-06
Authors
Mohd Sharimin Rashid
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
This paper presents an investigation and simulation of DC/DC buck converter by using
LTspice. Buck converter is a converter that is capable of lowering input voltage as an
output voltage. Pulse Width Modulation (PWM) signal with constant duty cycle to drive
the switch of the converter. Instead of using the conventional buck converter, this project
will replace the normal diode to Schottky’s diode and SMPS. The minimum size of
inductor is calculated and the minimum value for the capacitor is calculated and simulated
without affecting the circuit overall performance. The buck converter are made of several
sub circuit such as comparator, voltage reference, SMPS and ramp voltage. Every sub circuit are simulated separately and then as a whole. The author also present the
simulation results and discussion (in Chapter 4) related to the theoretical aspects. Results
shows that the DC/DC buck converter is able to maintain its load current at 1mA and load
voltage of 1.32V at input voltage of 1.4V to 6V. The efficiency of the circuit according
to the given limit of input voltage is more than 70%.