MEAN WELL NHDD-40-100W is a wire-style DC/DC constant-current LED driver for a nominal 380 VDC lighting bus. It supplies a nominal 100 mA and has a catalogue typical power of 35 W. The fully encapsulated plastic module uses fanless free-air convection and provides PWM dimming, remote ON/OFF, short-circuit protection and over-temperature protection. Select the LED string using the input-to-output voltage-difference requirement below.
Product Datasheet
Download MEAN WELL NHDD-40 Datasheet (PDF)
The NHDD-40 section is on PDF pages 1, 2, 3, 4, 5, 6. Refer to the complete mechanical drawings and notes when planning installation.
Model and Constant-Current Output
| Complete model / connection style |
NHDD-40-100W; W identifies the six-wire version. Catalogue revision 2024-10-16. |
| Output current / typical power |
100 mA constant current; 35 W typical. The series name does not establish an unconditional 40 W output rating. |
| Catalogue voltage entry |
350 V DC typical is printed in the specification table. It is not a guaranteed allowable output voltage at every input voltage; the LED-selection condition below applies. |
| Current ripple / tolerance |
Current ripple 40% maximum at rated current; current tolerance ±15%. |
| LED-string voltage selection |
The difference between input voltage and the total forward voltage of the LED string must be at least 40 V and must not exceed 80 V (catalogue Note 7). |
Do not assume that a 350 V LED string is suitable at the nominal 380 V input merely because both values appear as typical table entries: that pair has only a 30 V difference and does not satisfy Note 7. Verify the actual LED forward voltage over operating conditions against the 40–80 V difference requirement to avoid unexpectedly high output current.
Unless otherwise specified, catalogue measurements use 380 VDC input, rated current and 25°C ambient. Typical power and voltage entries are reference values, not a wider operating envelope.
DC Input and Startup
| Input range |
360–420 VDC; nominal application bus 380 VDC. This module takes DC input; the application diagram uses a separate upstream AC/DC supply. |
| Typical efficiency / input current |
94% efficiency measured at 100 mA / 380 VDC; typical input current 0.1 A at 380 VDC. |
| Setup time |
500 ms at 380 VDC, measured at first cold start. Repeated ON/OFF cycling can increase startup time. |
| Shutdown input current |
2 mA maximum at 380 V input with PWM dimming turned off. |
Low input voltage can require derating. Apply the input range and LED-voltage difference together; the catalogue does not provide a numeric low-input load curve here that would justify a separate full-power guarantee.
PWM Dimming and Remote ON/OFF
| PWM signal |
100 Hz to 1 kHz; the waveform is illustrated with a 5 V high level and 0 V low level. |
| ON condition |
Leave PWM DIM open, or apply a high level above 1.5 V and up to 5 VDC relative to the dimming return. |
| OFF condition |
PWM DIM below 0.9 VDC, or shorted to the dimming return. |
| Duty-cycle characteristic |
Use the published 10–100% duty-cycle plot on page 3. It is marked with a typical ±5% tolerance; during dimming the output current becomes PWM pulses. |
| Switch control |
The page-3 switch is connected between PWM DIM and DIM−: open gives DIM ON (100%); closed gives DIM OFF. |
Leave the PWM DIM+ connection open if dimming and remote control are not used. The catalogue does not define switching behavior in the gap between the stated OFF and ON thresholds or a calibrated current law below the plotted duty range.
Protection
| Short circuit |
Hiccup mode; automatic recovery after the fault is removed. |
| Over-temperature |
IC1, the main control IC, detects a typical junction temperature of 150°C; shutdown with automatic recovery after temperature decreases. This is an internal junction threshold, not an allowed ambient or case temperature. |
| Reverse polarity |
The protection table states no damage under reverse polarity; use the specified input and output polarity for normal operation. |
| Input undervoltage |
The driver shuts down when input voltage is below 359 V. |
Cooling and Operating Environment
| Cooling / orientation |
Fanless free-air convection. The page-3 load-versus-temperature curves are marked for horizontal orientation. |
| Ambient-temperature curve |
The plotted 100% load region extends from −30°C to +40°C ambient (Ta). Do not treat the +90°C case limit as an ambient operating rating. |
| Case-temperature curve |
The separate Tcase curve extends from −30°C to +90°C at 100% load; maximum case temperature is +90°C. Observe the ambient and case requirements together. |
| Humidity / storage |
Operating: 20–90% RH, non-condensing. Storage: −40°C to +80°C and 10–95% RH. |
| Temperature coefficient |
±0.03%/°C over 0–50°C. |
| High-altitude allowance |
For this fanless module, above 2000 m reduce the permitted ambient temperature by 3.5°C per additional 1000 m. |
Keep the finished luminaire within both the ambient and case-temperature limits under its actual enclosure and airflow conditions.
Connections and Wiring
| Pin 1 / Blue |
-Vout: LED negative. |
| Pin 2 / Yellow |
+Vout: LED positive. |
| Pin 3 / Red |
+Vin: DC input positive. |
| Pin 4 / Black |
-Vin: DC input negative; do not connect to -Vout. |
| Pin 5 / White |
PWM DIM+: ON/OFF and PWM dimming; leave open when unused. |
| Pin 6 / Black |
PWM DIM-: Dimming return; separate lead from -Vin recommended. |
| Other positions |
N.C.; no connection. Use the drawing for the actual populated connection positions. |
Do not connect −Vin to −Vout. Use the bottom-view pin layout on page 4 to identify the physical positions rather than reading the drawing as a top view.
The W version has separate black leads for −Vin and PWM DIM−. The catalogue recommends a separate DIM− wire from the −Vin wiring; identify each lead by its numbered position and function, not color alone.
Mechanical Installation and Weight
| Body dimensions |
32.1 × 20.5 × 12.5 mm (L × W × H). General mechanical tolerance ±1 mm; use the complete bottom-view drawing for PCB or harness layout. |
| Housing / potting |
Fully encapsulated plastic housing with epoxy potting, UL94-V0 as listed. |
| Catalogue unit weight |
18 g for this wire version. This is the page-2 unit-weight entry, not a carton gross weight. |
| Wire specification |
All wires: UL1569, 22 AWG. |
| Illustrated lead dimensions |
The side view marks the pin-5 lead as 75 ±10 mm and the pin-1/pin-2 output leads as 100 ±10 mm, with illustrated stripped ends of 5 ±2 mm. Do not infer unlabelled lead lengths from these dimensions. |
| Soldering limits |
Wave soldering: 265°C for 5 s maximum. Manual soldering: 390°C for 3 s maximum. |
| Vibration |
10–500 Hz, 2G; 10 min per cycle, 60 min on each of the X, Y and Z axes. |
The catalogue provides module and connection dimensions; it does not list a mounting-bracket, connector-housing or mating-contact order code for this module. Do not infer that separate mounting hardware or system components are included.
System Examples and External Components
| UHP-1500-380E |
Separate upstream AC/DC supply shown feeding the 380 VDC lighting bus; it is not part of the NHDD module. |
| DAP-04 |
External interface shown between the DALI bus and the PWM control connections of the NHDD drivers. |
| DLP-04L |
DALI bus power supply shown in the first application example. |
| DLC-02 |
DALI-2 controller shown in the second application example. |
| DOB support |
The manufacturer offers a DOB solution using a circuit diagram and key components such as a driver IC and choke. Contact MEAN WELL for the applicable solution; this PDF does not supply complete orderable IC or choke codes. |
These are external components in the catalogue application diagrams, not an included accessory list. The NHDD interface specified here is PWM / ON-OFF; the diagrams do not make the module a native DALI driver. Select the upstream supply, control devices and LED luminaires for the complete installation.
The catalogue illustrates panel, indoor, recessed, linear, DC-house and industrial lighting applications. It also directs customers to MEAN WELL or its PBM partners for 380 VDC luminaire details; no specific luminaire model is established by that statement.
Standards and Reliability
| Safety standards listed |
LVD BS EN/EN61347 and EAC TP TC004 approved, as stated in the manufacturer catalogue. |
| EMC emissions |
Compliance with BS EN/EN55015 and EAC TP TC020. |
| EMC immunity |
BS EN/EN61000-4-2, -3, -4, -6 and -8; light-industry level, criteria A; EAC TP TC020. |
| MTBF reference |
15362.0 K hours minimum under Telcordia SR-332 (Bellcore); 2779.1 K hours minimum under MIL-HDBK-217F at 25°C. These calculated reliability figures are not a service-life or warranty duration. |
| Manufacturer warranty statement |
The manufacturer literature lists a five-year warranty; applicable manufacturer terms govern. |
This driver is a component of the final lighting system. Test EMC with the finished device; an additional EMI filter may be needed. Follow the manufacturer EMC test-report guidance rather than assuming that the module declaration certifies the complete luminaire.
Catalogue Packing Reference
Page 6 lists standard tube packing: 15 pieces per tube, one-box gross weight 0.3 kg, up to 750 pieces per carton, carton gross weight 15.6 kg and carton dimensions 540 × 242 × 125 mm. It also lists tray packing: 40 pieces per tray, one-box gross weight 1.0 kg, up to 200 pieces per carton, carton gross weight 5.03 kg and carton dimensions 332 × 292 × 215 mm.
The page does not explicitly assign those packing methods to the model suffixes. These are catalogue packing references, not the quantity supplied by this product listing; use the separate unit weight above for the individual module.
