Hesambook
Full Member level 2
A DC-to-DC converter is one of the most commonly used circuit topologies in electronics, especially in power supply applications. There are three main types of DC-to-DC converters (non-isolated): Buck, Boost, and Buck-Boost. Sometimes a buck converter is also called a step-down converter and a boost converter is also called a step-up converter. A buck converter reduces/steps down the input voltage while increasing the output current.
In this article/video, I introduced an adjustable buck converter circuit that can deliver up to 30A and handle up to 40V at the input. The output voltage is adjustable from 3V to 37.5V. Several PCB design rules were followed to enhance output stabilization and current handling, also to reduce the radiated emission, and noise figure.
To design the schematic and PCB, I used Altium Designer 22 and the electronic search engine (octopart) to easily and quickly collect information about the necessary components. To get high-quality fabricated boards, I sent the Gerber files to PCBWay and finally tested the current handling, output stability, and noise figure using the Siglent SDL1020X-E DC load, Siglent SDM3045X multimeter, and Siglent SDS2102X Plus oscilloscope. Just build one and have fun!
Specifications
Input Voltage: 6-40VDC
Output Current: 30A (max continuous, See text)
Output Voltage: 3-37.5VDC Adjustable
Output Noise: 50mVpp, 4mVrms (18A load-20MHz)
References
article: https://bit.ly/3rmbPDF
[1]: UC3843: https://octopart.com/uc3843bd1r2g-onsemi-497860?r=sp
[2]: IR2104: https://octopart.com/ir2104spbf-infineon-65872813?r=sp
[3]: Altium Designer: https://www.altium.com/yt/myvanitar
In this article/video, I introduced an adjustable buck converter circuit that can deliver up to 30A and handle up to 40V at the input. The output voltage is adjustable from 3V to 37.5V. Several PCB design rules were followed to enhance output stabilization and current handling, also to reduce the radiated emission, and noise figure.
To design the schematic and PCB, I used Altium Designer 22 and the electronic search engine (octopart) to easily and quickly collect information about the necessary components. To get high-quality fabricated boards, I sent the Gerber files to PCBWay and finally tested the current handling, output stability, and noise figure using the Siglent SDL1020X-E DC load, Siglent SDM3045X multimeter, and Siglent SDS2102X Plus oscilloscope. Just build one and have fun!
Specifications
Input Voltage: 6-40VDC
Output Current: 30A (max continuous, See text)
Output Voltage: 3-37.5VDC Adjustable
Output Noise: 50mVpp, 4mVrms (18A load-20MHz)
References
article: https://bit.ly/3rmbPDF
[1]: UC3843: https://octopart.com/uc3843bd1r2g-onsemi-497860?r=sp
[2]: IR2104: https://octopart.com/ir2104spbf-infineon-65872813?r=sp
[3]: Altium Designer: https://www.altium.com/yt/myvanitar
