1. Introduction
The EverSale LPF-25-48 is a 25W AC/DC LED driver designed for reliable power delivery. It features dual modes for constant voltage and constant current output, making it versatile for various LED lighting applications. This power supply operates efficiently from 90 to 305VAC and is available in models with rated voltages ranging from 12V to 54V. With an efficiency of up to 87% and a fanless design, the LPF-25-48 can operate in a wide temperature range of -35°C to +70°C under free air convection. Its robust design includes a plastic housing with Class II protection, built-in active Power Factor Correction (PFC) function, and full encapsulation to an IP67 level, ensuring durability and safety. The typical lifetime exceeds 50,000 hours, backed by a 5-year warranty.
2. Safety Instructions
Please read these safety instructions carefully before installation and operation to prevent personal injury or damage to the device.
- Qualified Personnel: Installation and maintenance should only be performed by qualified electricians.
- Power Disconnection: Always disconnect the power supply from the mains before any installation, wiring, or maintenance work.
- Proper Grounding: Ensure proper grounding according to local electrical codes.
- Ventilation: Although fanless, ensure adequate air circulation around the unit to prevent overheating. Do not cover the unit.
- Environmental Conditions: Do not expose the unit to temperatures or humidity levels outside its specified operating range.
- Load Matching: Ensure the connected load (LED module) is within the power supply's specified output voltage and current range.
- Wiring: Use appropriate gauge wiring for input and output connections to prevent overheating and ensure stable operation.
- IP67 Rating: The IP67 rating indicates protection against dust and immersion in water up to 1 meter for 30 minutes. However, avoid prolonged submersion or high-pressure water jets.
3. Installation
The LPF-25-48 power supply is designed for easy installation. Follow the guidelines below for optimal performance and safety.
3.1 Mechanical Specification
Refer to the diagram below for the physical dimensions and wiring details of the LPF-25-48 unit. All dimensions are in millimeters (mm).
Image 1: Mechanical specifications of the LPF-25-48 power supply. This diagram illustrates the physical dimensions (300x20mm, 148mm, 3.5mm, 3.6mm, 60mm, 32mm), wire types (SJTW 18AWG for AC IN, SVT 18AWG*2C for DC OUT), and the location for Tcase (Max. Case Temperature) measurement. It also shows the AC/N (Blue) and AC/L (Brown) input wires, and +V (Red) and -V (Black) output wires.
3.2 Mounting Direction
Proper mounting ensures efficient heat dissipation and longevity of the power supply. The recommended mounting direction is shown below to facilitate free air convection.
Image 2: Recommended mounting direction for the LPF-25-48 power supply. The diagram illustrates the unit mounted horizontally, which is ideal for maximizing heat dissipation through natural air convection.
3.3 Wiring Connections
Connect the input and output wires as indicated in the mechanical specification diagram. Ensure all connections are secure and insulated.
- AC Input: Connect the AC/L (Brown) and AC/N (Blue) wires to your mains power supply (90-305VAC).
- DC Output: Connect the +V (Red) and -V (Black) wires to your LED module or load.
4. Operation
The LPF-25-48 operates in dual modes: Constant Voltage (CV) and Constant Current (CC). Understanding these modes is crucial for proper application.
4.1 Block Diagram
The internal architecture of the power supply is represented by the block diagram below, illustrating the flow of power and control mechanisms including PFC, power switching, and protection circuits.
Image 3: Block diagram of the LPF-25-48 power supply. This diagram illustrates the internal components and their interconnections, including the EMI filter, PFC circuit, power switching stage, rectifiers, detection circuit, Over Load Protection (O.L.P.), Over Voltage Protection (O.V.P.), and the PWM & PFC control unit. The Fosc (switching frequency) is 100KHz.
4.2 Derating Curve
The derating curve illustrates the maximum permissible load as a function of ambient temperature. Operating within the specified temperature range is essential to maintain the power supply's performance and lifespan.
Image 4: Derating curve for the LPF-25-48 power supply. This graph shows that the power supply can operate at 100% load up to approximately 50°C ambient temperature, after which the load must be reduced linearly down to 60% at 70°C. Operation below -30°C also requires derating.
4.3 Static Characteristics
The static characteristics graph shows the relationship between the output load and the input voltage, indicating the power supply's stability across its operational input voltage range.
Image 5: Static characteristics of the LPF-25-48 power supply. This graph illustrates that the power supply maintains 100% load capability across a wide input voltage range, typically from 90VAC to 305VAC at 60Hz, with a slight reduction at lower input voltages.
4.4 Power Factor Characteristic
The power factor (PF) characteristic demonstrates the efficiency of power utilization. A higher power factor indicates less reactive power and more efficient energy use.
Image 6: Power Factor Characteristic of the LPF-25-48 power supply. This graph shows the power factor (PF) in constant current mode as a function of load percentage for input voltages of 110V, 230V, and 277V. The PF generally increases with load, reaching values above 0.95 at higher loads, indicating efficient power utilization.
4.5 Efficiency vs. Load (48V Model)
This graph illustrates the power supply's efficiency at various load percentages for the 48V model, demonstrating its superior working efficiency, especially at higher loads.
Image 7: Efficiency vs. Load for the LPF-25-48 (48V model). This graph shows the efficiency percentage as a function of load percentage for input voltages of 110V, 230V, and 277V. The efficiency peaks at around 87% at higher loads, confirming the power supply's high operational efficiency.
4.6 Driving Methods of LED Module
The LPF-25-48 supports both Constant Voltage (CV) and Constant Current (CC) driving methods, allowing flexibility for various LED applications. The typical LED power supply I-V curve is shown below.
Image 8: Typical LED power supply I-V curve. This graph illustrates the operational characteristics of the LPF-25-48, showing the Constant Voltage (CV) area (A), the Constant Current (CC) area (B), and the Hiccup Protection region (C). In the constant current region, the highest voltage at the output depends on the configuration of the end systems. Should there be any compatibility issues, please contact Mean Well.
There are two primary methods for driving LED modules: "direct drive" and "with LED driver". A typical LED power supply may employ either work in "constant voltage mode (CV)" or "constant current mode (CC)" to drive the LEDs. Mean Well's LED power supply with CV+CC characteristic can be operated in both CV mode (with LED driver, at area (A)) and CC mode (direct drive, at area (B)). In the constant current region, the highest voltage at the output depends on the configuration of the end systems. Should there be any compatibility issues, please contact Mean Well.
5. Maintenance
The LPF-25-48 power supply is designed for long-term, maintenance-free operation due to its robust construction and IP67 rating. However, periodic checks can help ensure optimal performance.
- Visual Inspection: Periodically inspect the unit for any signs of physical damage, loose connections, or discoloration.
- Cleaning: If installed in a dusty environment, gently wipe the exterior of the unit with a dry, soft cloth to remove any accumulated dust. Do not use liquid cleaners.
- Environmental Check: Ensure the operating environment remains within the specified temperature and humidity ranges.
- No User-Serviceable Parts: The unit contains no user-serviceable parts. Do not attempt to open or repair the power supply, as this will void the warranty and may pose a safety risk.
6. Troubleshooting
If the LPF-25-48 power supply is not functioning as expected, consider the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No output voltage/LEDs not lighting up |
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| Intermittent operation |
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| Output voltage/current is incorrect |
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If troubleshooting steps do not resolve the issue, please contact EverSale customer support for further assistance.
7. Specifications
Key technical specifications for the EverSale LPF-25-48 Power Supply:
- Model: LPF-25-48
- Output Voltage: 48V
- Output Current: 0.53A
- Approx. Wattage: 25W
- Input Voltage Range: 90-305VAC
- Operating Modes: Constant Voltage (CV) + Constant Current (CC)
- Power Factor Correction (PFC): Built-in active PFC function
- Efficiency: Up to 87%
- IP Level: IP67 (Fully encapsulated)
- Mechanical Form: Plastic housing with Class II design
- Operating Temperature: -35°C to +70°C (case temperature, under free air convection)
- Typical Lifetime: >50,000 hours
- Item Weight: 13.3 ounces (0.83 Pounds)
- Material: Plastic
- Manufacturer: Mean Well
8. Warranty & Support
The EverSale LPF-25-48 Power Supply comes with a comprehensive 5-year warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.
Warranty Exclusions: The warranty does not cover damage caused by improper installation, misuse, unauthorized modifications, accidents, or natural disasters. Any attempt to open or repair the unit will void the warranty.
Customer Support: For technical assistance, warranty claims, or any questions regarding the LPF-25-48 power supply, please contact EverSale customer support through the retailer where the product was purchased or visit the official EverSale website for contact information.