How to Make DC to DC Boost Converter using UC3843

Introduction

A DC to DC boost converter is a voltage booster circuit that increases the output voltage of a DC power source. It is commonly used in various electronic devices like smartphones, laptops, and LED drivers, where a higher voltage is required than the input voltage. In this article, we will discuss how to make a DC to DC boost converter using the UC3843 PWM Controller IC, along with the necessary components. So, now let’s get started and dive into the details of the components used in this simple and easy electronics project.

Circuit Diagram of DC to DC Boost Converter

This project can be designed using a few basic components. The circuit diagram of this project is shown below.

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Components List of DC to DC Boost Converter

Following is the list of all components used in this project:

• 1 x UC3843 IC
• 1X IRFZ44 MOSFET
• 1 x MBR2060CT Diode
• 1 x 100uH Inductor
• 3 x 1n Capacitors
• 4 x 1000u 50V Capacitors
• 2 x 10k Trimpot
• 1 x 0.1R 5W Resistor
• 1 x 22R Resistor
• 1 x 470R Resistor
• 1 x 2K2 Resistor
• 3 x 10k Resistors
• 1 x 100k Resistors
• 2 x 2 Pin Terminal Block
• jumper wires

Major Components of DC to DC Boost Converter

UC3843 PWM Controller IC

The UC3843 IC is a versatile PWM controller integrated circuit that is widely used in DC to DC converters. It is designed for power supply applications and offers various features like internal temperature compensation, soft-start capability, and overvoltage protection. The IC operates at a fixed frequency of 50 kHz, which ensures stable and efficient operation of the boost converter.

The UC3843 IC contains an error amplifier, a PWM comparator, a voltage reference, an oscillator, and a driver for the external MOSFET. It is available in various package types like DIP, SOP, and TO-220. The IC requires external components such as resistors, capacitors, and an inductor to build the DC to DC boost converter circuit.

IRFZ44 MOSFET

The IRFZ44 is a popular N-channel enhancement-mode power MOSFET. It is used as the switching element in the boost converter circuit to regulate the voltage. The MOSFET has a low on-resistance, which results in minimal power losses and high efficiency. It can handle a maximum drain current of 49A and can sustain a voltage of up to 55V.

The IRFZ44 MOSFET requires a suitable heat sink to dissipate the heat generated during operation. It is crucial to select a heat sink with adequate thermal conductivity to prevent the MOSFET from overheating. The MOSFET can be easily driven by the UC3843 IC with the help of a gate resistor and a pull-up resistor.

MBR2060CT Diode

The MBR2060CT is a Schottky barrier rectifier diode commonly used in boost converters. It has a low forward voltage drop, which ensures minimal power dissipation and high efficiency. The diode can handle a maximum forward current of 20A and has a rugged design, making it suitable for demanding applications.

The MBR2060CT diode is used in the boost converter circuit as a freewheeling diode. It allows the current to flow in a single direction when the MOSFET is turned off, preventing reverse current flow and protecting the circuit components. The diode should be chosen based on its forward voltage drop and current rating to ensure reliable operation.

100uH Inductor

The 100uH inductor is a key component in the voltage booster circuit. It stores energy when the MOSFET is switched on and releases it when the MOSFET is turned off, resulting in a higher output voltage. The inductor should have a high saturation current rating and low series resistance to minimize power losses.

The selection of the inductor depends on the desired output voltage and current. It is recommended to choose an inductor with a higher inductance value to achieve better voltage regulation and stability. The inductor should also be rated for the maximum current that will flow through it to prevent saturation and overheating.

10k Trimpot

The 10k trimpot, also known as a trimmer potentiometer, is a variable resistor used for fine-tuning the output voltage of the boost converter circuit. It allows precise adjustment of the feedback voltage, which is used by the UC3843 IC to regulate the output voltage. The trimpot can be adjusted using a small screwdriver.

The value of the trimpot should be selected based on the desired output voltage range. A trimpot with a higher resistance value would offer better precision in voltage regulation. It is important to connect the trimpot in the feedback loop of the UC3843 IC in the voltage booster circuit to ensure accurate voltage regulation.

Conclusion of DC to DC Boost Converter

In conclusion, a DC to DC boost converter is a valuable voltage booster circuit for increasing the output voltage of a power source. The UC3843 IC, IRFZ44 MOSFET, MBR2060CT diode, 100uH inductor, and 10k trimpot play crucial roles in building an efficient and stable boost converter circuit. It is important to select these components based on their specifications to achieve the desired voltage regulation and efficiency. By following the guidelines mentioned in this article, you can successfully make a DC to DC boost converter using the UC3843 IC and other components.

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