LM2596S DC-DC Adjustable Step-Down Power Supply Module with Voltmeter – Support Documentation
The LM2596S DC-DC Adjustable Step-Down Power Supply Module is a versatile and efficient solution for converting higher DC voltages to lower, stable outputs. Equipped with an integrated digital voltmeter, it allows real-time monitoring of input and output voltages, making it ideal for various electronic projects and applications.
Key Features
- Input Voltage: 4.0V to 40V DC
- Output Voltage: 1.25V to 37V DC (adjustable)
- Output Current: 2A (rated), 3A (maximum with adequate heat dissipation)
- Conversion Efficiency: Up to 92%
- Switching Frequency: 150 kHz
- Output Ripple: <30mV
- Load Regulation: ±0.5%
- Voltage Regulation: ±2.5%
- Operating Temperature: -40°C to +85°C
- Dimensions: 48mm x 23mm x 14mm (L x W x H)
- Integrated Digital Voltmeter: Displays input or output voltage with ±0.1V accuracy
- Protection Features: Input reverse polarity protection, output short-circuit protection, thermal shutdown
Pinout Description
| Pin Label | Description |
|---|---|
| IN+ | Positive input voltage (4.0V to 40V DC) |
| IN- | Ground (0V) for input voltage |
| OUT+ | Positive output voltage (1.25V to 37V DC, adjustable) |
| OUT- | Ground (0V) for output voltage |
| Potentiometer | Adjusts the output voltage; rotate clockwise to increase, counter-clockwise to decrease |
| Button | Switches voltmeter display between input and output voltage readings |
Setting Up the Module
- Connect Input Voltage: Connect the positive terminal of your DC power source to IN+ and the negative terminal to IN-.
- Connect Load: Connect your load to OUT+ and OUT- terminals, ensuring correct polarity.
- Adjust Output Voltage: Use a small screwdriver to turn the potentiometer. Monitor the output voltage on the digital display or with a multimeter connected to the output terminals.
- Switch Voltmeter Display: Press the onboard button to toggle the voltmeter between displaying input and output voltages. An indicator LED will show which voltage is currently displayed.
Applications
- Power supply for Arduino, Raspberry Pi, and other microcontrollers
- Battery-powered projects requiring regulated voltage
- DIY electronics and prototyping
- LED drivers and lighting projects
- Charging circuits for lithium-ion batteries (with appropriate charging control)
Troubleshooting
- No Output Voltage: Ensure input voltage is within the specified range and properly connected. Check for correct polarity.
- Output Voltage Not Adjustable: Verify that the potentiometer is functioning and not damaged. Ensure the load does not exceed the module’s current capacity.
- Module Overheating: If drawing currents near 3A, attach a heatsink to the LM2596S chip and ensure adequate ventilation.
- Voltmeter Display Inaccurate: Calibrate the voltmeter by comparing with a trusted multimeter and adjusting the module’s calibration settings if available.
Frequently Asked Questions
Can I use this module to increase voltage?
No, the LM2596S module is a step-down (buck) converter, meaning it can only reduce voltage from a higher input to a lower output.
Is the output voltage stable under varying loads?
Yes, the module maintains a stable output voltage with a load regulation of ±0.5%, ensuring minimal voltage fluctuation under different load conditions.
Can I power the module with a 5V USB supply?
Yes, if your desired output voltage is less than approximately 3.5V, considering the dropout voltage. Ensure the input voltage is at least 1.5V higher than the desired output voltage.
Is the module suitable for charging batteries?
While the module can supply a regulated voltage, it lacks specific charging control features. For safe battery charging, use a dedicated charging controller in conjunction with this module.
Conclusion
The LM2596S DC-DC Adjustable Step-Down Power Supply Module with Voltmeter is a reliable and efficient solution for various electronic applications requiring voltage regulation. Its integrated voltmeter and adjustable output make it a valuable tool for hobbyists and professionals alike.