1. Introduction
The JESSINIE MH-KC24 is a versatile DC-DC buck voltage converter module designed to provide a stable 5V output by default, with automatic adjustment between 3V and 12V upon triggering various fast charging protocols. This module supports a wide input voltage range of 6V to 32V and is capable of delivering up to 24W of power. It integrates multiple protection features, making it suitable for a variety of applications requiring efficient and safe power conversion for USB-powered devices.
2. Safety Information
- Ensure correct input voltage polarity. Incorrect connections can damage the module and connected devices.
- Do not exceed the specified input voltage range (6V-32V) or output power (24W).
- Avoid short circuits at the output terminals. The module includes short circuit protection, but prolonged short circuits should be avoided.
- Operate the module in a well-ventilated environment to prevent overheating.
- Keep the module away from moisture, dust, and corrosive substances.
- This product is an electronic component and should be handled with care. If you are unsure about installation, consult a qualified professional.
3. Product Features
- Wide Input Voltage Range: 6V-32V DC.
- Adjustable Output Voltage: Default 5V, automatically adjusts between 3V-12V with fast charging protocol trigger.
- High Output Power: Up to 24W (e.g., 5V@3.4A, 9V@2.5A, 12V@2A).
- High Conversion Efficiency: 90%-97%.
- Multiple Fast Charging Protocols Supported: DCP, BC1.2, Apple, Samsung, Huawei FCP/SCP, AFC, Spreadtrum SFCP, QC2.0, QC3.0, MTK PE1.1/PE2.0.
- Comprehensive Protection: Input overvoltage/undervoltage protection, input overcurrent protection, output overcurrent/short circuit protection, overtemperature protection.
- LED Indicator: Indicates working status for easy testing.
4. Specifications
| Input Voltage Range | 6V - 32V DC |
| Output Voltage | Default 5V, automatic adjustment 3V-12V (Fast Charge Trigger) |
| Output Power | Max 24W (e.g., 5V@3.4A, 9V@2.5A, 12V@2A) |
| Conversion Efficiency | 90% - 97% |
| Supported Protocols | DCP, BC1.2, Apple, Samsung, Huawei FCP/SCP, AFC, Spreadtrum SFCP, QC2.0, QC3.0, MTK PE1.1/PE2.0 |
| Protection Features | Input Overvoltage/Undervoltage, Input Overcurrent, Output Overcurrent/Short Circuit, Overtemperature |
| Indicator | LED for working status |
5. Setup and Installation
The MH-KC24 module requires a DC power source within the 6V to 32V range. Connections are made via solder pads on the module. Observe proper polarity when connecting the input power.
Figure 1: Top view of the MH-KC24 module, highlighting the USB output port and main components.
Connection Steps:
- Input Power: Identify the 'IN+' and 'IN-' pads on the module. Connect the positive terminal of your DC power source (6V-32V) to 'IN+' and the negative terminal to 'IN-'. Ensure connections are secure and correctly polarized.
- Output Connection: Plug your USB-powered device (e.g., smartphone, tablet, dash cam) into the USB-A output port on the module.
- Verification: Once power is applied, the LED indicator on the module will illuminate, signifying operation.
Figure 2: Bottom view of the MH-KC24 module, illustrating the input terminals and supported fast charging protocols.
6. Operating Instructions
The MH-KC24 module operates automatically. When a compatible fast-charging device is connected to the USB output port, the module will detect the device's required charging protocol and adjust its output voltage accordingly (between 3V and 12V) to optimize charging speed. For devices that do not support fast charging protocols, the module will default to a 5V output.
- Standard Charging: When a device is connected, the module initially provides 5V.
- Fast Charging: If the connected device supports a recognized fast charging protocol (e.g., QC3.0, FCP), the module will negotiate with the device to deliver a higher voltage (e.g., 9V or 12V) and current, up to 24W, for faster charging.
- LED Indicator: The onboard LED provides a visual confirmation that the module is powered and operational.
7. Maintenance
- Keep the module clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Regularly inspect solder joints and connections for any signs of wear or corrosion.
- Ensure adequate airflow around the module, especially during continuous high-power operation, to prevent heat buildup.
- Store the module in a dry, cool environment when not in use.
8. Troubleshooting
- No Output Power:
- Check input power source: Ensure it is within the 6V-32V range and providing sufficient current.
- Verify input polarity: Confirm 'IN+' and 'IN-' are connected correctly.
- Check connections: Ensure all solder joints are secure and there are no loose wires.
- Inspect for damage: Look for any visible damage to the module components.
- Slow Charging:
- Check USB cable: Use a high-quality USB cable that supports fast charging.
- Device compatibility: Confirm your device supports one of the fast charging protocols listed (QC2.0, QC3.0, FCP, etc.).
- Input power limitations: Ensure your input power source can supply enough current for fast charging (e.g., for 12V@2A output, you need at least 2A from a 12V input, considering efficiency losses).
- Module Overheating:
- Reduce load: The module may be operating at its maximum capacity.
- Improve ventilation: Ensure adequate airflow around the module.
- Check for short circuits: An undetected short circuit could cause excessive heat.
9. Typical Applications
- Solar panel to mobile phone charging.
- Vehicle charging transformation (e.g., converting 12V car power to USB fast charging).
- Driving recorder power supply.
- Household power supply projects.
- Intelligent plug-in transformation.
- Fast charging adapter for various electronic devices.
10. Warranty and Support
JESSINIE products are designed for reliability and performance. For technical support or inquiries regarding this product, please refer to the retailer where the product was purchased or visit the official JESSINIE website for contact information. Please retain your proof of purchase for any warranty claims.
