WD5020 20A DC Adjustable Step Down Power Supply Module DC Buck Converter Display Voltage Current

WD5020 20A DC Adjustable Step Down Power Supply Module DC Buck Converter Display Voltage Current

Attention:
Please read introductions carefully before use. The module has passed tests before delivery. After receiving the goods, please browse its wiring method first, and then power on to test before soldering.

Calibration Instructions:
The module has a calibration function, so don't worry about inaccurate measurement display. If you find that the display is inaccurate, you can use the following method to calibrate. After receiving the product, it is recommended to perform a calibration according to the following method.

Voltage Calibration:
In the case of no load and power failure, press and hold + Button, power on, enter voltage calibration mode, and the LCD screen will start to flash. Release + Button, press the + Button to increase the number, press - Button to decrease. The calibration value is the correct input voltage. For example, if the input voltage is 12.65V, the current voltage will be adjusted to 12.65V, and it will be automatically saved after 2 seconds. The calibration is completed when the power is turned off and exited!

Special Note:
Some customers reported that the output voltage could not be adjusted when they first received the modules, because the default output voltage of the module is about 20V when it leaves the factory. When you encounter this kind of problem, please turn CV potentiometer counterclockwise for more than 10 turns until the voltage value changes, and then use the module to adjust the voltage normally.

Features:
- 20A DC adjustable step down power supply module.
- Constant voltage and constant current.
- LCD screen displays voltage and current.
- Made from premium materials, it is more stable and reliable.
- Large heat sink ensures excellent heat dissipation performance.

Module Parameters:
- Input voltage: DC 7V-50V
- Output voltage: DC 0V-36V continuously adjustable (can only be used as a step-down module, the input voltage must be greater than the output voltage by more than 2V)
- Output current: 0-20A adjustable, maximum peak value 20A (recommended to use within 15A)
- Output power: maximum 300W (recommended to use within 250W, please reduce the power when using large pressure difference)
- Working temperature: -20 to 75℃ (pay attention to the temperature when using, please strengthen ventilation and heat dissipation if it exceeds)
- Conversion efficiency: up to 95%
- Short-circuit protection: Yes, the constant current value currently set
- Input reverse connection protection: Yes
- Output anti-backflow: None, used to connect to motors when charging. Please buy another diode!
- Wiring mode: Wiring terminal or welding terminal, VIN is input, VOUT is output
- Module size: 100 x 60 x 48mm (LxWxH)
- Weight: 182g

Package Included:
- 1 x Step Down Power Supply Module

Noe: Battery is not included in the package.



Setting Instructions:
Set by + Button, display modes are divided into three types:
1. F-0 mode: display output voltage;
2. F-1 mode: display input voltage;
3. F-2 mode: alternately display input and output voltage;

Instructions for use: Press + Button to cycle through three display modes. Press - Button to save and exit, and press - Button alone to switch the backlight of LCD screen.



Application Range:
Only when the actual load output current is greater than the set current, it is in constant current mode and constant current is adjustable. Otherwise it will work in a constant voltage state, when the current is adjusted to 2A, it does not mean that any connected equipment will become 2A. Only when output voltage is above 2V, constant current will take effect!

1. Used as an ordinary step-down module, with over-current protection:
(1) When no-load, adjust potentiometer CV to make the output voltage reach the voltage value you want;
(2) Directly short-circuit the positive and negative terminals of the output terminal of the module (Find a thick wire or tweezers to short-circuit the output terminal. Note: Do not adjust the voltage when short-circuiting). At this time, adjust potentiometer CC to make the displayed current value reach the preset over-current protection value; or adjust the current after connecting a load. (For example, the current value displayed by the on-board ammeter is 4A, then the maximum current of the module is limited to 4A. When the current reaches 4A, red CC indicator light will be on).

2. Use as a battery charger (Battery is not included):
Attention: For recharging batteries, connecting motors, etc., remember to add a diode to the output of the module to prevent backflow. When a diode is not added, MOS tube will be burned.
(1)Determine the floating charge voltage and charging current of a battery; (If the lithium battery parameter is 3.7V/2200mAh, then the floating charge voltage is 4.2V, and the maximum charging current is 1C, which is 2200mA);
(2)Under no-load conditions, adjust potentiometer CV to make the output voltage reach the floating charge voltage;
(3)Directly short-circuit the positive and negative terminals of the module's output terminal (Find a thick wire or tweezers to short-circuit the output terminal. Please do not adjust the voltage when short-circuiting), adjust potentiometer CC to make the displayed current value reach the preset over-current protection value; or adjust the current after connecting a load. (For example, the current value displayed by the on-board ammeter is 4A, then the maximum current of the module is limited to 4A, and CC indicator light turns on when the current reaches 4A), the battery is connected to the back end of the anti-backflow diode.
(4)The default current of light change is 0.1 times the charging current. (During constant current charging, red CC indicator lights up. The current of the battery is gradually reduced during the charging process, and gradually changes from constant current charging to constant voltage charging, and yellow CV indicator lights up. If the charging current is set to 1A , then when the charging current is less than 0.05A, blue STA fully charged indicator lights up, and the battery is fully charged.

3. Use as a constant current LED driver module:
(1) Determine the operating current and maximum operating voltage you need to drive a LED;
(2) Under no-load conditions, adjust potentiometer CV to make the output voltage reach the LED operating voltage;
(3) Directly short-circuit the positive and negative terminals of the output terminal of the module (Find a thick wire or tweezers to short-circuit the output terminal. Note: Do not adjust the voltage when short-circuiting). At this time, adjust potentiometer CC to make the displayed current value reach the preset over-current protection value; or current can be adjusted after a load is connected. (For example, the current value displayed by the on-board ammeter is 4A, then the maximum current of the module is limited to 4A, when the current reaches 4A, red CC indicator light is on), connect the LED.