张三叔

PWM four-wire fan control, 12V to 5V, USB-A power supply

Overview

Reference: https://oshwhub.com/GloomyGhost/pwmfans, https://oshwhub.com/JasonSnake318/12v-zhuan-5v_buck-xiang-ya-dian-lu-mu-kuai

GP9101-F20K-L2H1-SW is used as the ADC chip to output PWM to control the four-wire computer fan. The Limin fan is used, without mediation. Only the lowest speed.
And convert 12V to 5V to power the USB-A port and the socket to improve utilization.
There are three PWM fan control bits, 2 USB-A power supplies, and 2 2.54 sockets.

Note:
The original expectation was that it could still be converted to 3.3V, maybe the components were not soldered well or there was some problem, it failed;
the LED status light also failed.
Other than this, everything else can be used normally, and I don’t plan to adjust it. If
the big guys have any needs, please come on and correct it!

Design Files

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Update:2025-06-24 05:46:18

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