User Manual

Introduction

The DROK DC-DC Adjustable Buck Voltage Converter Stabilizer is a versatile power module designed for various applications requiring precise voltage and current regulation. Featuring an LCD display, it provides real-time monitoring of input and output parameters. This module is equipped with protective features to ensure safe and reliable operation.

Key Features

• Integrated Protective Shell: Comes with a clear protective shell for enhanced durability and safety.
• Large LCD Display: Features a blue background and white digits for clear visibility from any angle, simultaneously displaying voltage and current.
• Adjustable Output: Functions as a constant voltage and current module with an input range of 6-32V and an adjustable output range of 1.25-32V. Note: Input voltage must be at least 1.5V higher than the desired output voltage.
• High Efficiency: Built with an imported MP2304 chip, offering a high conversion efficiency of up to 96%. Enhanced heat dissipation is recommended for currents exceeding 3A or power exceeding 35W.
• Calibration Functions: Includes voltage-calibration and current-calibration features for precise adjustments.
• USB Interface: Designed with a USB port for added convenience in various applications.
• Protection Features: Incorporates short circuit protection, input reverse polarity protection, and over-temperature protection (automatic shutdown).

Package Contents

The package includes the following items:

• 1 x DC-DC Adjustable Step-down Power Supply Module with Shell
• 4 x Copper Cylinder Screws M3*6
• 4 x Double-pass Screws M3*12
• 8 x Roundhead Screws M3*6

Setup

Assemble the protective shell around the module using the provided screws and standoffs. Ensure all components are securely fitted. Connect the input power source to the VIN terminals and the load to the VOUT terminals. Pay close attention to polarity (VIN+ to positive input, VIN- to negative input, VOUT+ to positive output, VOUT- to negative output).

Figure 1: Assembled DROK DC-DC Adjustable Buck Voltage Converter with its clear protective shell.

Figure 2: Detailed diagram illustrating the input/output terminals, LCD display, USB port, and adjustment potentiometers (ADJ-V for voltage, ADJ-I for current).

Figure 3: Internal view of the module, highlighting key components such as the power supply chip, single chip microcomputer, and USB output.

Figure 4: Dimensions of the DROK DC-DC Adjustable Buck Voltage Converter module (65.6mm x 40mm x 25mm).

Operation

This section details the operational procedures for the DROK DC-DC Adjustable Buck Voltage Converter.

Voltage Adjustment

The output voltage is adjusted using the ADJ-V potentiometer. Before leaving the factory, the output is typically set around 20V. If your input voltage is lower than this, turn the voltage potentiometer (ADJ-V) counter-clockwise for 10 or more turns until the voltage begins to change and reaches your desired level.

Current Adjustment

Current regulation can only be performed in constant current (CC) mode. The preconditions for constant current mode are:

• The actual output current of the load is greater than the set constant current value.
• The output voltage is higher than 2V.

Adjust the current using the ADJ-I potentiometer. Turn clockwise to increase current.

Calibration Procedures

For accurate readings, calibration of voltage and current is recommended.

• Voltage Calibration:
  1. With the device powered off, press and hold the "SET" key.
  2. While holding "SET", power on the device. The LCD screen will start to flash, indicating entry into voltage calibration mode. Release the "SET" key.
  3. Use the "SET" and "ENT" keys to increase or reduce the displayed voltage to match the actual input voltage measured by an external multimeter.
  4. The setting will automatically save after 2 seconds. Power off the device to complete calibration.
• Current Calibration: (Suitable for no-load with current display or slightly large current.)
  1. With the device powered off, press and hold the "ENT" key.
  2. While holding "ENT", power on the device. The LCD screen will start to flash, indicating entry into current calibration mode. Release the "ENT" key.
  3. Use the "SET" and "ENT" keys to increase or reduce the displayed current to match the actual current measured by an external ammeter.
  4. The setting will automatically save after 2 seconds. Power off the device to complete calibration.

Display Modes

The module's LCD display can show different parameters by pressing the "SET" button:

• F0: Displays the output voltage.
• F1: Displays the input voltage.
• F2: Alternately displays output and input voltage.
• USB: Displays USB output voltage and allows turning the USB output ON/OFF.

Specifications

Maintenance

To ensure the longevity and optimal performance of your DROK Voltage Converter, consider the following maintenance tips:

• Keep Clean: Regularly clean the module and its protective shell with a dry, soft cloth to prevent dust accumulation, which can affect heat dissipation.
• Ensure Ventilation: Operate the module in a well-ventilated area. If operating at higher currents (above 2A) or power (above 35W), ensure adequate heat dissipation, potentially by adding a fan or larger heatsink if not already present.
• Check Connections: Periodically inspect all wire connections to ensure they are secure and free from corrosion. Loose connections can lead to unstable operation or damage.
• Avoid Overload: Do not exceed the maximum specified output current or power. Continuous operation beyond limits can lead to overheating and permanent damage.
• Storage: When not in use for extended periods, store the module in a dry, cool environment, away from direct sunlight and extreme temperatures.

Troubleshooting

This section provides solutions to common issues you might encounter with your DROK Voltage Converter.

• No Display/No Output:
  • Check input power supply: Ensure the input voltage is within the 6-32V range and the power source is active.
  • Verify input polarity: Confirm that VIN+ and VIN- are connected correctly. The module has reverse polarity protection, but incorrect connection will prevent operation.
  • Inspect connections: Ensure all wires are securely connected to the terminals.
• Output Voltage Not Adjustable:
  • Ensure input voltage is at least 1.5V higher than the desired output voltage.
  • Turn the ADJ-V potentiometer multiple turns (10+) to initiate voltage change, especially if the factory setting is far from your target.
  • Attempt voltage calibration as described in the "Operation" section.
• Output Current Not Adjustable:
  • Ensure the module is operating in constant current (CC) mode. This requires the load's actual current draw to be higher than the set current, and output voltage above 2V.
  • Attempt current calibration as described in the "Operation" section.
• Module Overheating:
  • Reduce the load or output power.
  • Ensure adequate ventilation around the module.
  • If operating above 2A or 35W, enhance heat dissipation by adding a fan or improving airflow.
  • Check for short circuits in the output wiring or load.
• Inaccurate Readings:
  • Perform voltage and current calibration using a reliable external multimeter as a reference.

Warranty and Support

Specific warranty information for this product is not provided in the available data. For warranty claims, technical support, or further assistance, please contact DROK customer service directly through their official channels or the retailer from whom the product was purchased.

You can visit the official DROK store on Amazon for more information: DROK Store