Name: MEAN WELL LCM-40U series: Constant-current LED driver - LCM-40U
Brand: MEAN WELL
SKU: LCM-40U
Price: 126.17 USD
Availability: InStock

MEAN WELL LCM-40U series: Constant-current LED driver - LCM-40U

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Description

LCM-40U — Constant-current LED driver

MEAN WELL LCM-40U is a constant-current LED driver for indoor, office, architectural and panel lighting. This selection uses 500 mA with a 2–70 V DC output window; the driver rating is 35 W. It accepts 90–132 V AC or 127–186 V DC and provides 3-in-1 dimming with dim-to-off, active PFC and synchronization of up to 10 drivers. Its Class II plastic housing is cooled by free-air convection without a built-in fan.

Download MEAN WELL LCM-40U Datasheet (PDF)
Download MEAN WELL LCM-U Installation Manual (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

Model section: datasheet PDF pages 1–7. Installation manual: pages 1–2; use the current datasheet for the selected-current ratings and derating curves.

Model and selected output

Model and configuration	LCM-40U; analog 3-in-1 dimming version with auxiliary DC output.
Selected output current	500 mA
Selected DC voltage range	2–70 V DC. Keep the LED operating voltage within this window and observe the 35 W driver rating.
Rated output power	35 W; available output also depends on the selected current, voltage window and derating conditions.
Open-circuit voltage	110 V maximum for this current setting.
Selected DIP switch positions	Positions 1–6: ON OFF OFF OFF OFF OFF. The manufacturer identifies 700 mA as the factory default; verify and set the switches for the selected LED load before use.
Current tolerance	±5%.
Current ripple	5.0% maximum at rated current; measured at 50–100% of the maximum output voltage under rated power delivery.
Auxiliary DC output	12 V nominal, 11.4–12.6 V deviation, at 50 mA. The +FAN/−FAN terminals may supply an external fan; the driver itself is fanless.

Available DIP current settings

DIP setting: 350 mA	Positions 1–6: OFF OFF OFF OFF OFF OFF; output 2–100 V DC; open-circuit voltage 110 V maximum.
DIP setting: 500 mA	Positions 1–6: ON OFF OFF OFF OFF OFF; output 2–70 V DC; open-circuit voltage 110 V maximum.
DIP setting: 600 mA	Positions 1–6: ON ON OFF OFF OFF OFF; output 2–59 V DC; open-circuit voltage 110 V maximum.
DIP setting: 700 mA (factory default)	Positions 1–6: ON ON ON OFF OFF ON; output 2–50 V DC; open-circuit voltage 65 V maximum.
DIP setting: 900 mA	Positions 1–6: ON ON ON ON OFF ON; output 2–39 V DC; open-circuit voltage 65 V maximum.
DIP setting: 1050 mA	Positions 1–6: ON ON ON ON ON ON; output 2–34 V DC; open-circuit voltage 65 V maximum.

Input and electrical performance

Input voltage	90–132 V AC or 127–186 V DC. Apply the low-input-voltage derating curve.
Input frequency	47–63 Hz.
Active power factor correction	Built-in active PFC. Typical power factor ≥0.98 at 115 V AC and full load.
Total harmonic distortion	THD <20% at load ≥50%; performance varies with load as shown in the family curves.
Efficiency	87.5% typical, measured at the DIP setting 500 mA / 70 V. This is not a guarantee for every current setting or load.
AC input current	0.43 A typical at 115 V AC.
Inrush current	15 A typical at a 115 V AC cold start; pulse width 270 µs measured at 50% peak current, per NEMA 410.
Circuit-breaker loading	Maximum 22 drivers on a 16 A Type B breaker or 38 on a 16 A Type C breaker, at 115 V AC.
Leakage current	<0.5 mA at 120 V AC.
Setup time	1000 ms at 115 V AC, measured at the first cold start. Repeated switching ON/OFF can increase the setup time.
Switching frequencies	Block diagram: PFC oscillator 60 kHz; PWM oscillator 80 kHz.
General test conditions	Unless otherwise specified: 115 V AC input, rated output current and 25 °C ambient temperature.

3-in-1 dimming

Dimming inputs	Between DIM+ and DIM−, use 0–10 V DC, a 10 V PWM signal at 100 Hz–3 kHz, or additive resistance. Typical dimming-source current: 100 µA.
Resistance control	The curve spans 10 kΩ/N to 100 kΩ/N, where N is the number of drivers for synchronized dimming; these values are divided by N.
Minimum dimming and OFF	Minimum dimming is about 6%; output current is undefined in the interval 0% < Iout <6%. Output may drop to 0% with about 0 kΩ, 0 V DC or a 10 V PWM signal at 0% duty cycle.
Dimming connection restrictions	Do not connect DIM− to the negative LED output (−V). Direct connection to LEDs is recommended; operation with additional drivers is unsuitable. Do not activate temperature compensation during dimming.

Synchronization and temperature compensation

Synchronized operation	Up to 10 drivers: 1 master and 9 slaves. Dimming operating range 10–100%; the minimum depends on the dimmer setting. Set every driver to 100% dimming, the factory default dimming level, before synchronizing.
Synchronization cable	Flat cable, 22–24 AWG (0.2–0.3 mm²), length <5 m. Follow the SYN +/− connections shown in the family diagram.
External NTC function	Connect an external NTC resistor between +NTC and −NTC to sense the luminaire or surrounding environment. Without an NTC, the driver operates normally at the DIP-selected current.
NTC reference thresholds	220 kΩ: 100% of the selected rated current below 60 °C, reducing above 60 °C. 330 kΩ: below/above 70 °C respectively. 470 kΩ: below/above 80 °C respectively. Follow the corresponding reduction curve.
NTC component and control limits	Reference data use THINKING TTC03 resistors; MEAN WELL does not supply the NTC. Verify the temperature curve before substituting another brand. Dimming and synchronization are invalid while temperature compensation is in use.

Protection, temperature and environment

Short-circuit protection	Constant-current limiting; automatic recovery after removal of the fault.
Overvoltage protection	110–130 V; output shuts down. Re-power the driver to recover.
Overtemperature protection	Output shuts down; re-power the driver to recover. No trip-temperature value is specified in the table.
Working case temperature	Tcase −30 to +90 °C; maximum case temperature +90 °C. The case limit does not replace the selected-current ambient derating requirement.
Ambient load derating	For this setting, the horizontal-installation ambient curve stays at 100% from −30 to +50 °C, then decreases to 60% at +60 °C, where the curve terminates.
Low-input load derating	The 60 Hz static input curve shows 80% load at 90 V AC, rising to 100% at 100 V AC and remaining at 100% through 132 V AC.
High-altitude derating	For this fanless driver, reduce the permissible ambient temperature by 3.5 °C per 1000 m at operating altitudes above 2000 m (6500 ft).
Working humidity	20–90% RH, non-condensing.
Storage conditions	−40 to +80 °C; 10–95% RH.
Temperature coefficient	±0.03%/°C over 0–50 °C.
Vibration	10–500 Hz, 2 G; 10 minutes per cycle, for 60 minutes along each X, Y and Z axis.
Performance-curve conditions	Power-factor, THD and efficiency curves use 115 V AC input and Tcase 80 °C; separate curves show each DIP current setting.

Safety, construction and installation interfaces

Safety and enclosure	UL8750 approved; plastic housing with Class II design.
EMC emission	Compliance with FCC Part 15 Subpart B. Final equipment requires EMC requalification with its complete installation.
Withstand voltage	Input to output: 3.75 kV AC.
Isolation resistance	Input to output: >100 MΩ at 500 V DC, 25 °C and 70% RH.
Dimensions	123.5 ×81.5 ×23 mm (L ×W ×H); case LCM-60A. Mechanical drawing tolerance: ±1 mm.
Mounting drawing	Top-view fixing centers: 110 ×68 mm, with two Ø4.2 mm holes and 6.75 mm edge offsets. Side-view tabs: two Ø4 mm holes, 65.5 mm center spacing, 39.3 mm first-center offset, 7.8 mm tab widths and the indicated 4 mm vertical offset.
Case-temperature measurement point	The bottom-view tc point is located 40 mm from the right edge and 15 mm from the lower edge; these are position dimensions. Maximum Tcase is +90 °C.
Input terminal TB1	1 AC/L; 2 AC/N.
LED output terminal TB5	1 +V; 2 −V. Observe the output polarity.
Control terminal TB3	1 +FAN; 2 −FAN; 3 +NTC; 4 −NTC; 5 DIM+; 6 DIM−.
SYN connectors	CN101/CN100: JST B2B-XH or equivalent; pins 1 and 3 are +, pins 2 and 4 are −. Mating housing: JST XHP or equivalent; terminal: JST SXH-001T-P0.6 or equivalent. These are connector references, not a promise of supplied accessories.

Reliability, packing and documentation

MTBF	2649.1 thousand hours minimum, Telcordia SR-332 (Bellcore); 273.7 thousand hours minimum, MIL-HDBK-217F at 25 °C.
Unit weight reference	280 g (0.28 kg), catalog packing reference per unit; not a measured net weight.
Carton packing reference	54 units / 16 kg / 1.12 CUFT.
Manufacturer warranty	The manufacturer’s family catalog states a 3-year warranty; applicable service terms should be confirmed with the supplier.

Installation and system integration

Installation and ventilation	Installation must be carried out by a qualified electrician indoors. Leave 50 mm of ventilation clearance around the unit, use its cable clamp, and select suitable wiring and circuit protection. Keep the chosen LED voltage and power within the rated limits. Apply the current catalog ambient-temperature and case-temperature limits for the selected DIP current; the older manual temperature summary is not an all-current full-load rating.
LED load and DIP selection	Connect LED lamps directly to the driver; do not place an additional DC/DC converter between the driver and the LED lamps. Select the required output current with the DIP switches. The factory-default current is 700 mA; the current selected for this listing describes a configuration choice rather than a separately identified factory variant.
Push-terminal wire preparation	For the fitted AC/L, AC/N, LED-output and, where present, PUSH and DALI push terminals, the manual recommends solid conductors of 1.024–1.628 mm diameter, stranded conductors of 0.823–2.08 mm², or 14–18 AWG, with 10 mm stripped. Its recommended push-down force is 3–4 kp (6.61–8.81 lbf); this is an actuator force, not a tightening torque.
Small screw-terminal wiring	For fitted FAN, NTC and non-DALI DIM screw terminals, the manual recommends solid conductors of 0.404–0.643 mm diameter, stranded conductors of 0.129–0.326 mm², or 22–26 AWG, with 7 mm stripped. It lists a 3 mm Phillips screwdriver and a tightening torque of 2.88 kgf·cm (2.5 lb-in). Apply these instructions only to terminals actually fitted to the selected model.
Cover and terminal-release tools	For the blue cover, the manual specifies a 6 mm Phillips screwdriver and 4.6 kgf·cm (4 lb-in). Its cable-release instruction calls for a slotted screwdriver, while its push-terminal tool table lists 3 mm Phillips. Check the actual release actuator and use a suitable tool; do not apply cover or screw-terminal torque to a push terminal.
Synchronization wiring	Synchronize up to 10 drivers as one master and nine slaves, with a 10–100% dimming operating range. Use flat synchronization cable shorter than 5 m, with the specified 22–24 AWG / 0.2–0.3 mm² conductor recommendations. Set all units to 100% dimming before synchronization; the lowest operating level depends on the dimmer setting. Do not use the NTC temperature-compensation function simultaneously with synchronization.
Complete-system EMC verification	Verify EMC with the power supply installed in the complete lighting system and connected to a representative LED load. Wiring, assembly and the actual application can affect the result. The linked EMI document provides a test reference; it does not certify the finished system or prescribe installation clearances from its laboratory diagram.