MEAN WELL NHDD-40 Series LED Driver
High-Voltage DC-DC Step-Down | 380VDC Input | 100mA Constant Current | PWM Dimming
DC-DC High Voltage Constant Current Solution
The MEAN WELL NHDD-40 Series is an ultra-compact, high-efficiency DC-DC step-down constant current LED driver. Designed specifically for integration into high-voltage centralized DC power grids (such as 380VDC systems), it delivers a precise 100mA output for lighting fixtures.
Key Design Advantages
- High-Voltage DC Input: Optimized for nominal 380VDC inputs, accepting a wide range of 360~420VDC.
- Ultra-Compact Profile: Miniature design (32.1 x 20.5 x 12.5 mm) makes it exceptionally easy to build into luminaire housings and tight spaces.
- High Efficiency: Delivers energy savings with a high conversion efficiency reaching 94%.
- Fully Potted: Encased in UL94-V0 rated epoxy resin to protect against dust, moisture, and vibration.
Electrical Specifications
The NHDD-40-100 model is engineered to provide a stable, constant current output while drawing power directly from high-voltage DC buses.
| Parameter | Specification Detail |
|---|---|
| Output Current | 100mA |
| Rated Output Power | 35W (Typical) |
| Output Voltage Range | 350V (Typical) |
| Current Accuracy | ± 15% |
| Input Voltage Range | 360 ~ 420VDC (Rated for nominal 380VDC) |
| Efficiency (Typ.) | 94% |
Important Installation Note: To prevent output current overshoot and ensure proper operation, the voltage difference between the input and output (△V＝Vin-Vout) must be kept at or below 80V.
Advanced Dimming & System Protection
Despite its small size, the NHDD-40 comes equipped with smart dimming capabilities and a comprehensive suite of safety protections to safeguard the LED load and the driver itself.
PWM Dimming & Remote Control
- PWM Dimming: Supports PWM signal dimming (100 ~ 1K Hz frequency) for precise brightness control.
-
Remote ON/OFF:
- Power ON: PWM dimming pin > 1.5~5VDC (or left floating/open).
- Power OFF: PWM dimming pin < 0.9VDC (or shorted to ground). - Standby Current: Consumes only ~2mA at 380VDC when the power is turned off via the PWM pin.
Comprehensive Protections
- Short Circuit: Hiccup mode; automatically recovers after the fault condition is removed.
- Over Temperature: Triggers when the internal IC junction temperature (Tj) exceeds 150°C. Shuts down output and recovers automatically once cooled.
- Input Under-Voltage: The driver automatically shuts down if the input voltage drops below 359VDC.
- Reverse Polarity: Built-in defense ensures the unit will not be damaged if input polarity is accidentally reversed.
Dimensions & Environmental Tolerance
Physical Characteristics
- Dimensions (L * W * H): 32.1 * 20.5 * 12.5 mm (1.26 * 0.8 * 0.49 inches)
- Weight: 15.6g (Pin type) / 18g (Wire type)
- Potting Material: High-grade Epoxy Resin (UL94-V0 rated for fire resistance)
Environmental Specifications
| Condition | Rating |
|---|---|
| Operating Temperature | -30°C ~ +40°C |
| Max Case Temperature (Tc) | < 90°C |
| Operating Humidity | 20% ~ 90% RH (Non-condensing) |
| Vibration Resistance | 10 ~ 500Hz, 2G 10min/cycle, 60 min each along X, Y, Z axes |
