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.
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