Switch Mode Power Supply (SMPS) Topologies (Part I)

he industry drive toward smaller, lighter and more
efficient electronics has led to the development of the
Switch Mode Power Supply (SMPS). There are several
topologies commonly used to implement SMPS.
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This application note, which is the first of a two-part
series, explains the basics of different SMPS
topologies. Applications of different topologies and
their pros and cons are also discussed in detail. This
application note will guide the user to select an
appropriate topology for a given application, while
providing useful information regarding selection of
electrical and electronic components for a given SMPS
The main idea behind a switch mode power supply can
easily be understood from t
he conceptual explanation
of a DC-to-DC converter, as shown in Figure 1. The
load, R
, needs to be supplied with a constant voltage,
, which is derived from a primary voltage source,
. As shown in Figure 1, the output voltage V
be regulated by varying
the series resistor (R
) or the
shunt current (I
When V
is controlled by varying I
and keeping R
constant, power loss inside the converter occurs. This
type of converter is known as shunt-controlled
regulator. The power loss inside the converter is given
by Equation 1. Please note that the power los


For more detail:   Switch Mode Power Supply (SMPS) Topologies (Part I)

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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