EEI TECHNOLOGY SYNP2000-EXTREME V1.2

• EEI TECHNOLOGY SYNP2000 series project, synchronous rectification Buck step-down adjustable power module has constant voltage, constant current functions, customized overvoltage (OVP), overcurrent (OCP), overpower (OPP) protection, improved self-calibration algorithm V2 makes the output voltage and current less than the set value less than 0.005. The synchronous rectification scheme has a maximum efficiency of 97%. No blocking delay is used in the program. In addition, a Σ-Δ ADC is used, which refreshes quickly and the data is basically the same. It won't vibrate.

• The output is equipped with an ideal diode (OR-ING), which can effectively avoid current backflow when charging the battery and cause the module to burn.
• The input has anti-reverse connection, which can prevent the power module from burning due to reverse connection of the input power supply.
• Good load regulation, any voltage with 0-30A load, the output voltage drop is less than 0.02V.
• Power-off memory function: After a power-off and then on again, the CC/CV settings set before the power-off will be memorized (and the specified storage group M0-M9 can be set to be stored in the power-on memory).
• High-side sampling is used to collect the output current, and the load can be grounded with the input power supply without affecting the constant current.

Performance parameters

• Input voltage range: 10-60V
• Output voltage range: 0-50V (maximum output voltage depends on input voltage Vmax = Vin * 0.88)
• Output current range: 0-30A
• Converter topology: Synchronous rectifier Buck
• Peak output power: 1500W
• Converter efficiency: 90% - 97%
• Setting - Readback error: ±0.005V/A(max)
• Readback - Actual voltage error: ±0.02V/A (max)
• Output ripple: < 160mVpp (typ)

Precautions

• Try not to short-circuit the output multiple times, because this version uses a voltage mode control scheme with slightly poor dynamic response performance. Frequent short-circuit may cause the switch tube to burn out.
• Reverse connection is prohibited when charging the battery. Reverse connection will cause the module to burn.
• Please ventilate well during long-term high-power operation.
• This project is incompatible with the previous RT300 project program and cannot be applied!
• The screen uses Jin Yichen's negative display COG12864 (JYC12864-215C), and the main control is UC1701X, which is common with ST7565 and ST7567 (try not to use screens of unknown origin, otherwise the display content may be flipped or mirrored).
• If you use other screens, you can privately chat with me to change the program (only for 12864 screens). It currently supports most COG12864s on the market, as well as some 12864OLEDs (SSD1306 SSD1309 SH1106 SH1107).
• The encoder has 30 positioning and 15 pulses and is not compatible with 20 positioning and 20 pulses.
• Program flashing method: Use STLINK mass production tool to flash, first burn "SYNP2000-EXTREME_DEBUG.bin", then adjust the system settings and protection settings according to the instructions, and then flash the "SYNP2000-EXTREME_LCD.bin" bin file after adjustment It's in the attachment, please download it yourself.
• The operation method is the same as RT300-MK.IV
• Inductor winding method: 11 turns of 3x1.2mm wire, 130125 iron silicon aluminum magnetic ring (never use iron powder core magnetic ring, that is, yellow and white magnetic ring, no matter what the reason, otherwise you will regret it)
• ADC must buy an ADS1115 module and then disassemble it from above, otherwise it is very likely to buy a fake ADS1115 (only 12-bit accuracy), and then because the resolution is not enough, the DAC's self-calibration mechanism will keep the output voltage twitching.
• For the error amplifier TL082, for the sake of insurance, it is best to buy it on Lichuang Mall. There are many fake ones on Taobao. The slew rate cannot be reached and the dynamic response will be very poor.
• The current display will be abnormal when the device is turned on for the first time. You need to adjust the bias voltage of the current sensor, that is, the "OSVOL CAL" item on the "SYSTEM" page. Adjust this value and turn on the output to adjust to any voltage until the current display returns to zero.

Special Note

• The source code is not made public for the time being, only the BIN file is provided (because it may be used in subsequent products), please understand.
• This project is only for personal DIY or learning purposes. It is prohibited to sell, disseminate, or copy it for commercial purposes. If discovered, we will be held accountable.
• You can also purchase our finished products (Xianyu or Taobao transactions). If you indicate in private message that it is from an open source platform, you can get some discounts.
• Please copy the finished product purchase link ( Xianyu  ) to your mobile phone to view.
• Radiator purchase link ( https://item.taobao.com/item.htm?id=578944898142 )
• LCD screen purchase link ( https://item.taobao.com/item.htm?id=520379236144 )

PCB preview (front)

PCB preview (back)

Physical map

Power module motherboard PCB panel

1.1KW pressure test in progress

The temperature of the radiator after one hour of testing (room temperature 32°C)

Ripple measured when inputting 30V and outputting 12V 30A Lower tube VDS (SW) waveform

Project PACK#2: PCB Panel