12VDC to 48VDC/135mA Boost Converter

Introduction

This design prototype will involve a tightly packed and more powerful boost converter in Analog Devices IC LT8330. The boost converter generates high-voltage outputs with low input at power sources with fewer external components. The IC LT8330 is a simple boost converter with the current mode DC. It can produce positive and negative voltages with the help of a single feedback pin, and it takes a quiescent current of about 6µA. The single feedback pin with an anchored 2MHz switching frequency can be utilised in programming both the positive and the negative output.

Component Needed

• C1 1 1uF C_Small Capacitor_SMD:C_0805_2012Metric Unpolarized capacitor, small symbol
• C2 1 4.7pF C_Small Capacitor_SMD:C_0805_2012Metric Unpolarized capacitor, small symbol
• C3, C4 2 4.7uF C_Polarized_Small_US Capacitor_SMD:CP_Elec_6.3x9.9 Polarized capacitor, small US symbol
• D1 1 D_Schottky_Small D_Schottky_Small Diode_SMD:D_0805_2012Metric Schottky diode, small symbol
• J1 1 12VDC Screw_Terminal_01x02 282834-2:TE_282834-2 Generic screw terminal, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/)
• J2 1 48VDC/135mA Screw_Terminal_01x02 282834-2:TE_282834-2 Generic screw terminal, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/)
• L1 1 6.8uH L_Small Inductor_SMD:L_0805_2012Metric Inductor, small symbol
• R1 1 1M R_Small_US Resistor_SMD:R_0805_2012Metric Resistor, small US symbol
• R2 1 34.8k R_Small_US Resistor_SMD:R_0805_2012Metric Resistor, small US symbol
• U1 1 LT8330ES6TR LT8330ES6TR LT8330ES6TR:TSOT-23_S6

Boost Converter Circuit Connection and Operation

Every component mentioned earlier is an SMD component; thus, assembling the elements in a printed circuit board is advisable. The IC LT8330 consumes an input range of between 3V and 40V input, designed as the boost, SEPIC, or rather a very low quiescent current inverting converter. The IC offers a solid operation in various input and output voltages with the help of an internal compensated current mode.

Circuit Diagram

IC LT8330 Pinout Connectivity

The SW is the internal power switch pin, while the GND is the ground connection pin. The FBX is the voltage regulation feedback pin for positive and negative outputs. The EN/UVLO pin is the closure and the low voltage detection pin. The INTVCC pin regulates the 3V power supply for the inner load pins. Lastly, the VIN pin acts as the input power supply pin.

Key Features of a Boost Converter Circuit

Firstly, the boost converter circuit has a voltage boost, which primarily increases the output voltage, similar to the input voltage. Secondly, when designed well, the course is highly efficient, thus making it more suitable for devices powered by batteries and applications used in energy harvesting. Thirdly, the circuit can operate with various input voltages, making it more versatile in different cases. Lastly, the boost converter circuit works as a standard switching regulator, producing several output voltage ripples, which can be reduced using necessary filtering components.

Uses of Boost Converter Circuit

The boost converter is widely used in portable electronic devices, primarily where the battery voltage reduces as the battery discharges; thus, the converter stabilises the output voltage. The boost converter is also used in LED drivers for them to function efficiently. Electric vehicles also use it to step up the voltage to the drive motor from the battery. It is also used in wireless communication to offer the necessary voltage levels for receiving and transmitting signals. Lastly, the boost converter is used in photovoltaic systems to step up the voltage, thus charging batteries and power devices.

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