Topic: Switch Mode Voltage Regulationator

Provide the required voltage output to the design circuit.

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It serves many purposes such as stabilizing the voltage and protecting against surges.

Answer to Question: ENEL372 Power And Analogue Electronics


A switched-mode power supply is an electrically based power supply.

It includes a switching regulator that converts electricity accurately.

The regulator includes an LC Circuit, which maintains the desired output voltage through charging and discharging of the capacitor and inductor.

The switching mode power supplies transfers power from an AC Source to a DC Source.

The inductor’s current pulse is charged which, in turn, provides a stable output capacitor.

If the DC pulse turns off, the Schottky-diode discharges the inductor into a storage capacitor.

The regulator can be used to replace the Linear Regulator as it has switched mode power and higher stability.

Due to the high operating frequency, smaller transformers are used.

Variation in the load causes the voltage to change.

The feedback circuit measures the output voltage and is compared to the reference voltage.

The Feedback circuit will need power to run before it generates power.

A Non-Switching Energy-Supply is also available by default.

The Switch Mode Voltage Regulator has the objective to produce a controlled and constant output voltage for the circuit.

It is more efficient in terms of controlled output, which provides stability and safety against strong rushes and drops down to the desired voltage.

Theory of switching mode voltage regulator

Linear Voltage Regulator does not regulate PSUs. This is because there is an AC ripple, which is superimposed on DC components.

Electronic Noise can be heard at the Output terminals because of this.

Due to its switching frequency, the Switching mode Power Supply is noisy.

The Duty Cycle is used to control the output of Switching Mode Votage Regulator. This allows transistors within it to be switched ON completely or off.

It contains power transistors.

Asynchronous rectification mode allows for more stability and precision when the input voltage exceeds a certain level.

The formula to calculate output voltage is “Switch Mod Power Supply basics and Switching Regulators”, 2017.

Types of switchable regulators

Different aspects of the switched mode voltage Regulator are classified, including functions used and input power source.

There are two types of classified DC/DC Converters, depending on the type input power supply.

These converters include both isolated and non-isolated versions.

Pulse Width Modulations (PWM) or Pulse Frequency Modulations (PFM), are two types of operations found in Switching Mode voltage regulator.

There are three main types of conversions in Switching Mode Votage Regulator: Inverting, Boost and Buck.

Buck Converter, also known to be a step-down converter drops the voltage between its supply (input) and Load (output).

Boost Converter can be described as a step-up convertor that increases the voltage.

It is equivalent to a flyback conversion (“Types of Switching Regulators”, 2017).

Hierarchy of The Switching Regulators

The flow chart below shows the hierarchy of switching regulators.Circuit Design

The circuit used to regulate the voltage of the switch mode is for LM2575 voltage regulator.

The circuits used to switch power supplies can be greatly simplified using LM2575.

It is a highly efficient and low power consuming IC, which is a complete alternative to the previous 3 pin voltage regulators.

The circuit diagram below shows the internal structure for the LM2575.

As you can see, the LM2575 has the ability to provide 1 A of current with input voltages of 6 – 37 V.

As shown in the diagram, the schematic design for LM2575 can be used as a switching voltage regulator.

These are the components that were used.S. No.Component


DC supply6 – 40V2

Voltage regulatorLM25753Zener DiodeERB81-0044

Capacitor100uF, 330uF5


Resistor7.15k, 1k


Simulation result

This diagram illustrates simulation results.

The simulation results are represented by the blue lines. They denote the generated output voltage, Vout of the given Vin.

The green line in this diagram indicates the current generated for the output voltage. Next is the pink line which shows the results of current inductor Lout.

L is the inductance.

The simulation diagram’s violet line shows minute ripples in 20-milli Volt output voltage.


The Switching Mode Voltage Regulator generated a steady and controlled output voltage for the circuit.

It has demonstrated its key characteristics of Controlled Output, high Stability and High Stability.

The diagram below shows the correct results.

Refer to

Switch Mode Power Supply basics, and Switching Regulators. (2017).

Basic Electronics Tutorials. Retrieved 15 June 2017, from … upply.html

Types Of Switching Regulators (2017).

ROHMTECH WEB is a technical information site for power supply design. Retrieved 15 June 2017, from

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