TKXEC Digital Display DC-DC Step-down Power Supply Module Instruction Manual

1. Introduction

This manual provides detailed instructions for the TKXEC Digital Display DC-DC Step-down Power Supply Module. This versatile module, built around the XL4016 chip, offers adjustable constant voltage (CV) and constant current (CC) output, making it suitable for various applications such as battery charging, LED driving, and general power supply needs. It features a digital display for real-time monitoring of output voltage and current, along with indicator LEDs for operational status.

2. Product Features

• Digital display for output voltage and current.
• Adjustable constant voltage (CV) and constant current (CC) output.
• Built-in XL4016 chip for stable performance.
• LED indicators for Constant Current (red/blue), Constant Voltage (blue), and Full Charging (green).
• Short circuit protection.

3. Specifications

4. Component Overview

Familiarize yourself with the module's components using the diagram below:

Figure 1: Module Component Diagram

• Input Terminals (IN+ / IN-): Connect your DC power source here (8-40V).
• Output Terminals (OUT+ / OUT-): Connect your load or battery to be charged here (1.25-36V).
• Voltage Adjustable Potentiometer: Used to set the output voltage.
• Current Adjustable Potentiometer: Used to set the output current limit.
• U/A Switch Button: Toggles the digital display between output voltage and output current.
• LED Indicators:
  • Red & Blue (simultaneously bright): Constant Current (CC) mode active.
  • Blue (bright): Constant Voltage (CV) mode active.
  • Green (bright): Full Charging status (typically for battery charging applications).

5. Setup Instructions

1. Prepare Power Source and Load: Ensure your input DC power source is within the 8-40V range and your load or battery is compatible with the module's output range (1.25-36V).
2. Connect Input Power:
   • Connect the positive (+) terminal of your DC input power source to the "IN+" terminal on the module.
   • Connect the negative (-) terminal of your DC input power source to the "IN-" terminal on the module.
   • Caution: Ensure correct polarity to prevent damage to the module.
3. Connect Load/Battery:
   • Connect the positive (+) terminal of your load or battery to the "OUT+" terminal on the module.
   • Connect the negative (-) terminal of your load or battery to the "OUT-" terminal on the module.
   • For battery charging, ensure the battery voltage is within the module's output range.
4. Initial Power On: Apply power to the input. The digital display should light up, showing either the output voltage or current.

6. Operating Instructions

1. Adjusting Output Voltage (CV Mode):
   • With the module powered on and a load connected (or no load for initial voltage setting), press the "U/A" button until the display shows voltage.
   • Use a small screwdriver to turn the "Voltage Adjustable" potentiometer (refer to Figure 1). Turn clockwise to increase voltage, counter-clockwise to decrease.
   • Adjust to your desired output voltage.
   • 

     Figure 2: Voltage Display

2. Adjusting Output Current (CC Mode):
   • To set the current limit, it is recommended to short-circuit the output terminals (OUT+ and OUT-) with an ammeter or a low-resistance load.
   • Press the "U/A" button until the display shows current.
   • Turn the "Current Adjustable" potentiometer (refer to Figure 1). Turn clockwise to increase current, counter-clockwise to decrease.
   • Adjust to your desired maximum output current.
   • 

     Figure 3: Current Display
   • Note: Always set the current limit before connecting sensitive loads or batteries to prevent damage.
3. Switching Display:
   • Briefly press the "U/A" button to toggle the digital display between showing the output voltage and the output current.
4. LED Indicators Interpretation:
   • Red & Blue LEDs ON: Module is operating in Constant Current (CC) mode.
   • Blue LED ON: Module is operating in Constant Voltage (CV) mode.
   • Green LED ON: Indicates a "Full Charging" state, typically when charging a battery and the current drops below a set threshold.

7. Maintenance

• Cleaning: Keep the module clean and free from dust and debris. Use a soft, dry cloth for cleaning. Avoid liquids.
• Environment: Operate the module in a dry, well-ventilated environment. Avoid extreme temperatures and high humidity.
• Heat Dissipation: Ensure adequate airflow around the heatsinks, especially when operating at higher currents or power levels, to prevent overheating.
• Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.
• Storage: When not in use, store the module in a static-safe bag in a cool, dry place.

8. Troubleshooting

9. User Tips

• Verification with Multimeter: Always verify the output voltage and current with an external multimeter, especially for critical applications, as the onboard display may have minor inaccuracies.
• Setting Current Limit: When using the module as a battery charger, it is crucial to set the current limit (CC mode) before connecting the battery to prevent overcurrent.
• Potentiometer Sensitivity: The adjustment potentiometers can be sensitive. Make small, gradual turns to achieve precise settings.
• Heat Management: For prolonged operation at high power (e.g., close to 180W or 8A), ensure the module is mounted in a way that maximizes heat dissipation, possibly with additional cooling.

10. Warranty and Support

This product is designed for DIY and hobbyist use. For technical support or inquiries, please contact your seller or refer to online communities for similar electronic modules. Due to the nature of electronic components, specific warranty terms may vary by seller. Always ensure proper handling and operation to maximize product lifespan.