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Mean Well LCM-40TW Power Supply 42W 350mA 500mA 600mA 700mA(default) 900mA 1050mA - Tunable White

selectable output current using dip switchflicker-freeClass II without FGbuilt-in 3 in 1 dimming

SKU LCM-40TW

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Overview

LCM-40TW is the model of this series: rated power 40W Max. total, typical efficiency 87%.

LCM-40TW Series is a 40W constant power output LED driver with two channels output for Tunable white function. It can operate from 180~277V AC and output current ranging between 500 mA to 1050 mA selectable by dip switch. Thanks to high efficiency up to 87%, it is able to operate for -30℃ ~85℃ case temperature under free air convection. LCM-40TW is designed based on DALI-2 DT8 Tunable white and is also usable as two independent output channels with DT6 function. LCM-40TW can be adjusted for light intensity and color temperature by a push button as a simple way dimming, so it provides the design flexibility for LED Lighting application.

Features

DALI device type 6(DT6) and device type 8(DT8) available
Constant power mode output with 2 channels
Plastic housing with class II and PFC design
Flicker free, complying with IEEE1789
Standby power consumption <0.5W
Minimum dimming level 0.2%
Cooling by free air convection
Emergency lighting (EL) available
5 years warranty

Specifications

LCM-40TWSpecifications from the official datasheet (2026-02-09 edition)

OUTPUT

OUTPUT CHANNEL: CH1 / CH2
DC VOLTAGE RANGE: CH1: 20~50V / CH2: 20~50V
NO LOAD VOLTAGE: CH1: 53V / CH2: 53V
DEFAULT CURRENT: CH1: 700mA / CH2: 700mA
CURRENT ADJ. RANGE (BY DIP SWITCH): CH1: 500~1050mA / CH2: 500~1050mA
RATED POWER: 40W Max. total
CURRENT RIPPLE^Note5: <2%
DIMMING RANGE: 0~100%
START UP TIME^Note9: 500ms/230VAC

INPUT

VOLTAGE RANGE: 180~277VAC 260~390VDC
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR: PF≥0.98/230VAC,PF≥0.95/277VAC@full load (Please refer to "POWER FACTOR (PF) CHARACTERISTIC" section)
TOTAL HARMONIC DISTORTION: THD< 10%(@load 50%/230VAC; @load 75%/277VAC) (Please refer to “TOTAL HARMONIC DISTORTION(THD)” section)
EFFICIENCY(Typ.)^Note4: 87%
AC CURRENT: 0.23A/230VAC
INRUSH CURRENT: COLD START 20A(twidth=310μs measured at 50% Ipeak) at 230VAC; Per NEMA 410
LEAKAGE CURRENT: <0.75mA / 277VAC
STANDBY POWER CONSUMPTION^Note6: standby power consumption<0.5W (Dimming off)

PROTECTION

OVERLOAD: 105~135% rated output power Protection type: Hiccup mode, recovers automatically after fault condition is removed.
SHORT CIRCUIT: Constant current limiting, recovers automatically after fault condition is removed
OVER TEMPERATURE: Stage 1: Derating to 70% loading; stage2: Shut down.Recovers automatically after fault condition is removed

ENVIRONMENT

WORKING TEMP.: Tcase=-30~85℃ (Please refer to “ OUTPUT LOAD vs TEMPERATURE” section)
MAX. CASE TEMP.: Tcase=85℃
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +80℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃)
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes
OPERATING ALTITUDE: 2000 meters

SAFETY&EMC

SAFETY STANDARDS: ENEC BS EN/EN61347-1, BS EN/EN61347-2-13 (EL) appendix J suitable for emergency installations (DC Input: 180-260Vdc,AC Input: 200-240Vac); BS EN/EN62384 independent, GB/T19510.1, GB/T19510.213, EAC TP TC 004, BIS IS 15885(Part2/Sec13) approved
DALI STANDARDS: Comply with IEC62386-101, 102, 207(DT6),209(DT8),251
WITHSTAND VOLTAGE: I/P-O/P:3.75KVAC
ISOLATION RESISTANCE: I/P-O/P:>100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Compliance to BS EN/EN55015, BS EN/EN61000-3-2 Class C(@load 50%) ; BS EN/EN61000-3-3; GB/T 17743, GB17625.1, EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN61547, light industry level(surge immunity Line-Line 2KV), EAC TP TC 020

OTHERS

MTBF: 2111.7K hrs min. Telcordia SR-332 (Bellcore) 177.4Khrs min. MIL-HDBK-217F (25℃)
DIMENSION: 123.5*81.5*23mm (L*W*H)
PACKING: 0.24Kg ; 54pcs/15Kg/1.12CUFT

Test conditions and notes10

1. All parameters NOT specially mentioned are measured at 230VAC input, rated current and 25℃ of ambient temperature.
2. De-rating may be needed under low input voltages. Please refer to “STATIC CHARACTERISTIC” sections for details.
3. Length of set up time is measured at first cold start. Turning ON/OFF the driver may lead to increase of the set up time.
4. Efficiency is measured at 800mA/50V output set by DIP switch.
5. Current ripple is measured 50%~100% of maximum voltage under rated power delivery.
6. Standby power consumption is measured at 180~230VAC.
7. The driver is considered as a component that will be operated in combination with final equipment. Since EMC performance will be affected by the complete installation, the final equipment manufacturers must re-qualify EMC Directive on the complete installation again. (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf)
8. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
9. Based on IEC 62386-101/102 DALI power on timing and interruption regulations, the set up time needs to test with a DALI controller which can support for DALI power on function, otherwise the start up time will be higher than 0.5 second.
10. For more information, please contact with MEAN WELL sales.

Technical drawings

LCM-40TW DRIVING METHODS OF LED MODULE — DRIVING METHODS OF LED MODULE

LCM-40TW DIP SWITCH TABLE — DIP SWITCH TABLE

LCM-40TW LCM-40TW series — LCM-40TW series

LCM-40TW OUTPUT LOAD vs TEMPERATURE — OUTPUT LOAD vs TEMPERATURE

LCM-40TW TOTAL HARMONIC DISTORTION — TOTAL HARMONIC DISTORTION

LCM-40TW POWER FACTOR (PF) CHARACTERISTIC — POWER FACTOR (PF) CHARACTERISTIC

LCM-40TW EFFICIENCY vs LOAD — EFFICIENCY vs LOAD

LCM-40TW MECHANICAL SPECIFICATION — MECHANICAL SPECIFICATION

Typical applications

Downloads

Datasheet1

LCM-40TW datasheetLCM_40TW_spec.pdf · 2026-02-09 edition PDF Download

Payment & Security

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