MEAN WELL NLDD & NHDD Series DC-DC LED Drivers
The NLDD and NHDD series are specialized DC-DC constant current LED drivers designed for compact, PCB-integrated lighting applications. These modules provide efficient power conversion for systems running on DC power, ranging from low-voltage battery configurations to high-voltage centralized DC bus systems.
- NLDD-H Series (Step-Down/Buck): A high-efficiency DC-DC step-down converter designed for low-voltage LED applications. It takes a DC input (up to 56V) and delivers a precise constant current to the LEDs.
- NHDD-40 Series (High-Voltage DC Input): A specialized constant current driver designed to operate on high-voltage DC buses (380VDC). It is ideal for centralized lighting systems where power is distributed via high-voltage DC.
- Compact Design: Both series feature a miniaturized form factor suitable for soldering directly onto PCBs or integrating into tight luminaire enclosures.
- Thermal Efficiency: Engineered for minimal heat dissipation, ensuring long-term stability even in enclosed lighting fixtures.
Technical Highlights
- High Conversion Efficiency: NLDD-H reaches up to 96% efficiency (at 36/48VDC input), while the NHDD-40 achieves 94% efficiency, significantly reducing energy waste.
- Advanced Protections: Both series include auto-recovery protection against short circuits, over-temperature, and (for NHDD) input under-voltage, ensuring robust system reliability.
- Compact Footprint: Designed with small dimensions (approx. 32.1 x 20.5 x 12.5mm) for seamless integration into portable or architectural lighting designs.
- Encapsulated Reliability: Both series feature fully potted designs (Epoxy UL94-V0) providing protection against dust and moisture, suitable for harsh operating environments.
Series Comparison: NLDD vs. NHDD
Selecting between these series depends entirely on your DC input source and the voltage requirements of your LED strings.
| Feature | NLDD-H Series | NHDD-40 Series |
|---|---|---|
| Input Voltage | 10 ~ 56VDC | 360 ~ 420VDC (380VDC Typical) |
| Output Current | 350mA to 1400mA | 100mA (Fixed) |
| Topology | Step-Down (Buck) | High-Voltage DC Input Step-Down |
| Application | Battery-powered, solar, vehicle, or low-voltage DC bus lighting. | Specialized high-voltage centralized DC bus lighting systems. |
Design Note: The NLDD series is for standard DC-DC applications. The NHDD-40 is a niche product for high-voltage DC distribution infrastructure; ensure your power source strictly meets the 360VDC+ requirement before integration.
Control & Dimming
Both series support modern digital control methods, enabling integration with smart building automation and microcontroller-based systems.
| Feature | Description |
|---|---|
| PWM Dimming | Supports 100Hz ~ 1KHz PWM frequency input for high-precision brightness control, perfect for software-based dimming. |
| Remote ON/OFF | Built-in remote switch control allows the lighting system to be turned off electronically without interrupting the main DC power line. |
| Safety Compliance | Complies with major lighting safety standards (LVD BS EN/EN61347-1) and EMC standards (BS EN/EN55015) for professional-grade reliability. |
