SW3518S 100W full protocol fast charging source

First, this is an upgraded version of project https://oshwhub.com/acha/SW3518S

The previous version was rough and the wiring was very general. This time it was slightly improved.

Thanks to: https://oshwhub.com/zhqsoft/SW3518S The boss’s project provided me with some design and layout ideas

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
• All resistors and capacitors use 0603 , which is convenient for soldering. In fact, I don’t have 0402 in stock.
• Fast charge indicator, power indicator
• Testing completed

Notice

• Input 6-40V , 21-36V 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 needs to be at least 35V . For design and welding, I use 50V to provide redundancy.
• Continuing from the previous point, the more important thing is that if the user changes the withstand voltage value, he must base it on the actual situation. If you don’t understand it, don’t change it. For example, a car charger with 12V power supply can be appropriately reduced to 16V withstand voltage.
• 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 very easy to encounter strange problems, such as abnormal communication function of the C port and CC pin, etc. (personal experience, be sure to pay attention)
• In the schematic diagram, C7C8 is in different packages, which is convenient for purchase. You only need to solder 1
• About MOS : two DFN5*5MOS and two DFN3*3MOS . There is no need to buy according to the schematic diagram . I use two combinations myself, (AON6144+AON7534) / (CSD18512Q5B+WSD4038DN) . You can buy according to your own needs. The withstand voltage ( Vdss ) is at least 40V . If you go to a certain store, please be careful of fakes.
• 3518 supports 60W (20V3A) PD output , and 3518S theoretically supports 100W (20V5A) PD output . But the 3518S bought at Lichuang Mall only has a 60W PD output. I have studied this issue for a long time, and finally consulted the manufacturer's customer service and came to the conclusion that the 3518S does not turn on the 100W PD output by default and needs to be customized. To modify it yourself, you need to use IIC communication to modify the register. I don't know about this. If you are interested, you can ask the manufacturer's customer service. Alibaba sells a 100W version of customized firmware, please be sure to use it.
• The same manufacturer (Zhuhai Zhirong) also has the SW3516 product. I didn't find much difference in the datasheet. The manufacturer's technology also stated that SW3516 just does not support VOOC fast charging, so in theory this board can also support SW3516 (not tested) , if you have friends who have successfully verified it, you can leave a message in the comment area

Can be improved

This part can be improved. The problem is that I discovered it myself and was too lazy to change it. Most of these issues are minor and not planned to be fixed in subsequent releases.

• You can reduce line width and increase line spacing. The current line width of the board is 7.874mil (0.2mm) and can be produced by most board factories. jlc supports 5mil line width and can be modified.
• The SCK and SDA of 3518 can be exported for IIC communication. Useful for those who want to configure PD messages themselves.
• The shell is still being designed, and I’m already a beginner in modeling.

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Test 100W PD deception + load

Conditions: power supply 30V , port C output 20V5A

Equipment: Multimeter: UT61E+ Hantech 2D72  Power supply: RD6006

Aluminum case resistor with 4Ω load , using 5A fully functional Type-C cable with E-marker

The environment and conditions are very simple and are for reference only. Please forgive me.

(I forgot which model of MOS I used )

Roughly connected as shown in the figure

The input is 100.3W , the output is 93.04W , and the conversion efficiency is about 92.77% , excluding wire and other losses.

Test 2 100W PD deception ripple test

condition:

Input voltage 25V , using RD6006 adjustable power supply (switching power supply has large ripple)

Port C outputs 20V5A , using a 4 ohm aluminum shell resistor load

Oscilloscope: SDS1104X-C , bandwidth limit 20M , noise suppression turned on

Test method: Remove the ground clamp of the probe, use a ground spring, measure the output electrolytic capacitor C16 on channel 1 , and measure the input electrolytic capacitor C7 on channel 3

Single trigger waveform:

Approximate data: Vpp=54mV Vrms=15mV    frequency 127kHz

When the sampling mode is set to average and the number of averages is 16 :