XR76208 DC-DC Converter Breakout PCB
Posted: Wed Feb 12, 2025 2:47 pm
Last year I spent six months playing around with designing motor boards. I needed a 24V to 6.4V buck converter that could output at least 5-7 Amps. As my motor boards cost around A$250/ea, I thought it might be prudent to quickly design up a breakout PCB so I could test the efficiency of the DC-DC converter and check the heat load etc.
This PCB worked well with a input voltage of 24V and an output voltage of 6.4V. I was happy with the layout and design. It had a peak efficiency of 89.7% at 2A and was kind of flat at 86%-88% over a 0.5A to 5A output range. It fell to 80.7% at 7A output, with an auto thermal cutoff at 8A. The small board did get up to a toasty 122 degrees C while outputting 6A. Due to the number of thermal via's around the IC it can be a pain to replace via hot air.
This PCB worked well with a input voltage of 24V and an output voltage of 6.4V. I was happy with the layout and design. It had a peak efficiency of 89.7% at 2A and was kind of flat at 86%-88% over a 0.5A to 5A output range. It fell to 80.7% at 7A output, with an auto thermal cutoff at 8A. The small board did get up to a toasty 122 degrees C while outputting 6A. Due to the number of thermal via's around the IC it can be a pain to replace via hot air.
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