3A High Precision DC Adjustable Step-Down Module CC/CV Liquid Crystal Display Capacity Display ZK-J3XItem NO.: ZK-J3X

ZK-J3X 3A DC Adjustable Step Down Module

Pre Purchase Instructions!!!

The output voltage range of the USB port can be adjusted from 1-24V, not 5V. Please verify before connecting to the USB device, and we do not guarantee any losses caused as a result; The shipment comes with accessories such as acrylic heat sink copper column screws, which need to be assembled by oneself; The module is a DCDC DC to DC step-down module, which cannot input AC power directly reduced by a transformer; Do not overuse the input voltage. To increase the coefficient, it is recommended to connect a 3A fuse in series at the input end of the power module; This model is a step-down module, and the input voltage must be 2V higher than the output voltage. If the output voltage cannot be adjusted, it may be because the rotating position of the potentiometer is higher than the input voltage. You can first adjust the CV potentiometer counterclockwise for 20 turns to see the output voltage change.

Product Highlights:

1. Easy to adjust, voltage and current can be adjusted with a long handle knob, without the need for tools;

2. High precision calibration, self calibration of input and output voltage and output current, with voltage accuracy of 0.01V and current accuracy of 0.001A.

3. Various protections, including anti reverse connection - anti reverse connection without burning, anti backflow - direct connection to the battery, no need to worry about battery backflow burning the module, no need to connect another two tubes, overcurrent protection - output short circuit without burning, and charging pool current limiting;

4. Comes with a DC5.5 input port and a USB adjustable voltage output interface;

5. Display five parameters including capacity, input and output voltage display, output current display, power display, and capacity display;

6. The output ripple is small, and the output is equipped with LC filtering.

Product Parameters:

1. Input voltage: 5-27V (the input voltage should be 2V higher than the output voltage. If you want to output 5V, the input voltage should be more than 7V; if the output voltage cannot be adjusted, it may be because the rotating position of the potentiometer is higher than the input voltage, you can first adjust the CV potentiometer counterclockwise for 20 turns to see the output voltage change)

2. Output voltage: 1-24V (If the output voltage is higher than 24.5V, the output will be automatically turned off and displayed as OV. After lowering the output voltage, press the ONOFF button to solve the problem)

3. Output current: High output of about 3A, recommended for use within 2. When the heat is high, you need to solve the heat dissipation problem yourself. In constant voltage mode, the output current is adaptive according to the load size and not adjustable. (The adjustable limit current is about 3A, and if the output current exceeds 3A, the output will be automatically turned off, displaying OC. After reducing the load current, press the ONOFF button to solve the problem.)

4. Output power: less than 30W (when the output power is greater than 30W, the output will automatically turn off and display OP. After reducing the load power, press the ONOFF button to solve the problem)

5. Voltage display: resolution 0.01V, factory precision ± 0.1V or so (if the precision is high, it can be manually corrected after comparing with the standard voltmeter)

6. Current display: resolution 0.001A, range 0-3A, factory accuracy ± 0.0; When the output current is less than 0.0, the display error is large, and small currents within 10-40mA cannot be displayed (if there is a high requirement for accuracy, it can be manually calibrated after comparing with a standard ammeter. Calibration is more accurate when the output current is greater than 1A)

7. Capacity display: Resolution of 0.001 Ah, range of 99.99 Ah (can be reset by long pressing the '-' key, automatically saved after power off, and automatically accumulated after power on. After reaching 99.99 Ah, saturation is required, and manual reset is required)

8. Conversion efficiency: less than 95%

9. Working current: about 30mA

10. Input reverse protection: Yes

11. Output end anti backflow: Yes, it can be directly connected to the battery for charging without the need for a second transistor (there is an equivalent fake load of 1K ohms inside the module output end, and continuing to charge the battery will cause battery power loss. Mind this, please connect another second transistor in series at the output end)

12. Short circuit protection: Yes

13. Dimensions: length * width * height 73.4mm * 55.54mm * 30.5mm

14. Weight: 67.8g (including accessories, weighing 41.5g)