DC-ATX power supply

There are different project versions under the same project, but LCEDA can only display one version and you need to switch the version yourself.

Version: 1.1 is unfinished, version 2.0 has been verified , version 3.0 has been skipped, and version 4.0 has been partially verified.

This power supply is a DC wide voltage converter to ATX computer power supply specifications, input 13V~24V, output 12V 5V 3.3V power supply and switch pin (PS-ON pin pull-down start)

Interface: One XT60 model aircraft input interface (24V30A), one 24P computer motherboard male interface (plugged into the motherboard), one 8P universal CPU module cable female socket (module extension cable is required to power the CPU), one 8P universal independent Graphics card module cable female socket (module extension cable is required to power the graphics card) , a 4P 2.54MM pitch female socket ( used to power the hard drive fan)

Protection: Input a 15A fuse + 24VTVS tube, each output voltage has a fuse + TVS (the voltage regulator tube in hand will be used for the final protection)

At the beginning of the design, I saw that the TD8655 chip manual stated that it could output 12V20A. It also specifically left the independent graphics interface. After actual measurement, considering the heat dissipation and internal resistance, it could only output 12V10A for a long time.

DC-ATX 1.1: Because the RT8110 chip bought on Taobao always exploded, 3.3V and 5V did not work properly, and Lichuang Mall did not have it in stock, so it gave up the subsequent verification of this version and replaced it with a new version.

DC-ATX 2.0:

It has been verified by board printing that the 12.3V, 5.2V, 3.4V, and 5VSB voltage output voltages normally meet the Intel ATX output ±5% range.

Design limit output power: 12V/20A 5V/8A 3.3V/8A    5VSB/3A

Actual measured limit output power : 11.5V/12A   4.75V/4.5A 3.13V/4.5A    5VSB/2A

Recommended rated power : 12V/10A   5V/2A 3.3V/2A    5VSB/2A

Since I don’t have an extra computer, I didn’t use it for actual testing. It’s still a semi-finished product and should be used with caution.

DC-ATX 3.0: Already designed but not yet board verified

DC-ATX 4.0: The board has been verified, and all output voltages and power-on/off LED indication functions are normal.

The 5V standby power supply and the 5V main power supply are combined, and the output is controlled by PMOS. Both the 3.3V and 5V circuits are optimized to a certain extent to increase the limit power. The 12V circuit uses a 22UH40A large inductor and a MOS parallel tube to further enhance the output power. Due to the overturn of the ESP32 electronic load meter (Various bugs) I barely tested it. A full test needs to wait until the load meter is debugged.

In the 12V output test, the maximum 232W load meter started to smoke and then the test was stopped.