35V-5A Adjustable Switching Power Supply (DC to DC Buck Converter)

[hesam.moshiri]

A DC-to-DC converter is one of the most commonly used circuits in electronics, especially in power supply applications. There are three major 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.

In this article/video, I introduce an adjustable 5A DC-to-DC converter circuit that uses an advanced chip, made by Texas Instruments, which is TPS5450. It’s a high-frequency and efficient buck converter chip. I have followed several PCB design rules to ensure low noise, low EMI, and high stability of the output voltage.

Please watch the video completely, from the start to the end. I've disclosed the design, provided an article, and shared several PCB designing tricks with you😉 I designed this board using Altium Designer. The PCB has been Fabricated by PCBWay. if you have Altium, I can share the original PCB project with you using Altium-365.😊

[dobsonr741]

Connection of C2, C3, C4 to GND could have used more copper than a single via just touching the copper island - maybe a triple stitch down, as D1 demonstrated on the PCB.

[mariush]

yeah, more vias... and you could have used better capacitors, ex polymer (solid) capacitors instead of those average electrolytics that aren't even "optimized" for low esr, if I'm looking at the right datasheet.
The tps5040 datasheet recommends for the typical application example in datasheet output capacitors with ESR under 40mOhm, so that the output will have low output ripple...
I don't even like those surface mount, rather have through hole capacitors.
Wouldn't trust octopart over the datasheet data, no guarantee 31v is the maximum output voltage and it's a weird value. look at maximum duty cycle and other things to figure out max voltage.

[hesam.moshiri]

Wouldn't trust octopart over the datasheet data, no guarantee 31v is the maximum output voltage and it's a weird value. look at maximum duty cycle and other things to figure out max voltage.

31V is correct, I could not find it in the datasheet, but TI mentioned this on the product page: https://www.ti.com/product/TPS5450