This project has been discontinued because I (and many others) are not satisfied with the design, wiring, etc.

New version: https://oshwhub.com/acha/SW3518S-100Wquan-xie-yi-kuai-cho

feature

• A port supports QC4+/QC4/QC3.0/QC2.0/AFC/FCP/SCP/VOOC/PE2.0/PE1.1/SFCP
• Port A can output 5V/5A
• C port supports PPS/PD3.0/PD2.0
• Port C can output 20V5A (SW3518S) or 20V3A (SW3518)
• Adding multiple 1206 chip capacitors can effectively filter out high-frequency ripples
• Fast charge indicator, power indicator
• SOP-8 NMOS, the test uses AO4484, which can be replaced with MOS tubes of similar specifications.
• Follow up soonAdded in REV2 version: ESD diode for port C and port A
• In the process of proofing and testing, pictures will be added later. Welding test in progressFinished test

Notice

• Input 6-40V, 25-36V is recommended. It can only reduce the voltage. The smaller the voltage difference, the smaller the heat.
• The withstand voltage of electrolytic capacitors and 1206 and 0805 capacitors must be at least 25V. Use 50V for design and welding to provide redundancy.
• In the schematic diagram, C6C7 is in different packages, which is convenient for purchase. Same for C12C13, only need to weld 1
• When welding 3518S, be sure to pay attention to the grounding of the soldering iron tip, etc., and try to use an air gun if possible, otherwise it is easy to encounter strange problems.

Known issues

• There are no screw holes reserved on the board. This is really my fault. Currently, I'm using hot melt glue to glue a few copper pillars on...
• (Not a problem) The filter capacitor and MOS are not cost-effective enough (as suggested by a certain Dalao). The output filter can be replaced with 0603/0805 and then added in number to save costs and achieve better results. MOS tubes can be replaced with models with smaller size and better performance.

Also: I always like Yukinoshita Yukino (funny

There are still a lot of blank boards. If you want it, please send me a private message to pay the postage. The finished product can also be sold after it is officially completed.

Update: Testing

Now that all the materials are in place, it’s time for a happy testing session

Because I'm more sophisticated, I don't have the conditions to measure parameters such as ripple, which require relatively high technology/equipment requirements. Please understand.

Some of the pictures were taken at different stages. The two large capacitors were not welded, so there was no big problem.

Power on: adjustable power supply directly to 12v

After powering on, the red indicator light turns on, and 12v is reduced to 5v, which can be measured at the second large electrolytic capacitor.

The USB-A port outputs 5V. For the convenience of shooting, it is measured at the MOS tube. The effect is the same.

The USB-C port has no output (only 1V is not considered good at all)

Connect the "load" and output 5V. The principle is to connect a 5.1k pull-down resistor to the CC pin to tell the power supply "Give me some power!"

Take a screenshot of a mobile phone that supports QC. It outputs 9V and the fast charge indicator lights up blue. Is the accuracy of my USB voltmeter too bad?

Use Huawei original cable to connect Huawei P20 Pro and trigger SCP for super fast charging. Fast charging indicator light is on

Since there is no more professional testing equipment (too expensive), there is currently no way to test the C-port fast charging. But I will probably buy some updates like wires in the future, so please look forward to it.

Continue to update on August 18 (Gu Gu Gu Gu does not exist! Taobao bought a PD decoy device and tested it with the USB CtoC cable: The output power ranges from 5V to 20V, a total of 5 groups

20V output actual measurement

Actual measurement of arbitrary voltage output

Connect to laptop to trigger 20V3A PD fast charging