Mean Well LPF-40D-42 Power Supply 40W 42V - Dimmable

Name: Mean Well LPF-40D-42 Power Supply 40W 42V - Dimmable 960mA
Brand: Mean Well
SKU: LPF-40D-42
Price: 32.57 USD
Availability: InStock

Overview

LPF-40D-42 is the 42V output model of this series: rated current 0.96A, rated power 40.32W, typical efficiency 88.5%.

LPF-40D series is a 40W AC/DC LED driver featuring the constant current output. LPF-40D operates from 90~305VAC and offers models with different rated voltage ranging between 12V and 54V. Thanks to the efficiency up to 89%, with the fanless design, the entire series is able to operate for -40℃ ~ +80℃ case temperature under free air convection. The entire series is rated with IP67 ingress protection level and is suitable to work for a variety of applications at dry, damp or wet locations. LPF-40D is equipped with the 3 in 1 dimming function so as to provide the design flexibility for LED lighting system.

Features

Constant current mode output
Plastic housing with Class II design
Built-in active PFC function
Class 2 power unit
IP67 rating for indoor or outdoor installations
Function: 3 in 1 dimming
Typical lifettime>50000 hours
5 years warranty

Specifications

LPF-40D-42Specifications from the official datasheet (2026-02-09 edition)

OUTPUT

DC VOLTAGE: 42V
RATED CURRENT: 0.96A
RATED POWER^Note.5: 40.32W
CONSTANT CURRENT REGION^Note.2: 25.2 ~ 42V
CURRENT RIPPLE: 5.0% max. @rated current
CURRENT TOLERANCE: ±5.0%
SETUP, RISE TIME^Note.6: 1000ms, 80ms / 115VAC 500ms, 80ms / 230VAC
HOLD UP TIME (Typ.): 16ms/230VAC 16ms/115VAC

INPUT

VOLTAGE RANGE^Note.5: 90 ~ 305VAC 127 ~ 431VDC (Please refer to "STATIC CHARACTERISTIC" section)
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR: PF≧0.97/115VAC, PF≧0.95/230VAC, PF≧0.92/277VAC@full load (Please refer to "POWER FACTOR (PF) CHARACTERISTIC" section)
TOTAL HARMONIC DISTORTION: THD< 20%(@load≧60%/115VC,230VAC; @load≧75%/277VAC) (Please refer to “TOTAL HARMONIC DISTORTION(THD)” section)
EFFICIENCY (Typ.): 88.5%
AC CURRENT: 0.6A / 115VAC 0.3A / 230VAC 0.25A/277VAC
INRUSH CURRENT(Typ.): COLD START 50A(twidth=210μs measured at 50% Ipeak) at 230VAC; Per NEMA 410
MAX. No. of PSUs on 16A CIRCUIT BREAKER: 12 units (circuit breaker of type B) / 20 units (circuit breaker of type C) at 230VAC
LEAKAGE CURRENT: <0.75mA / 240VAC

PROTECTION

OVER CURRENT: 95 ~ 108% Constant current limiting, recovers automatically after fault condition is removed
SHORT CIRCUIT: Hiccup mode, recovers automatically after fault condition is removed.
OVER VOLTAGE: 46 ~ 54V Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE: Shut down o/p voltage, re-power on to recover

ENVIRONMENT

WORKING TEMP.: Tcase=-40 ~ +80℃ (Please refer to “ OUTPUT LOAD vs TEMPERATURE” section)
MAX. CASE TEMP.: Tcase=+80℃
WORKING HUMIDITY: 20 ~ 95% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +80℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃)
VIBRATION: 10 ~ 500Hz, 5G 12min./1cycle, period for 72min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS^Note.8: UL8750, CSA C22.2 No. 250.0-08, ENEC BS EN/EN61347-1, BS EN/EN61347-2-13 independent, BS EN/EN62384 , EAC TP TC 004 , IP67, GB/T19510.1,GB/T19510.213 approved ; design refer to UL60950-1
WITHSTAND VOLTAGE: I/P-O/P:3.75KVAC
ISOLATION RESISTANCE: I/P-O/P:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION^Note.8: Compliance to BS EN/EN55015,BS EN/EN61000-3-2 Class C (@load≧60%) ; 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: 3439.0K hrs min. Telcordia SR-332 (Bellcore) ; 394.9Khrs min. MIL-HDBK-217F (25℃)
DIMENSION: 162.5*43*32mm (L*W*H)
PACKING: 0.45Kg; 32pcs/15.4Kg/0.93CUFT

Test conditions and notes12

1. All parameters NOT specially mentioned are measured at 230VAC input, rated current and 25℃ of ambient temperature.
2. Please refer to "DRIVING METHODS OF LED MODULE".
3. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
4. Tolerance : includes set up tolerance, line regulation and load regulation.
5. De-rating may be needed under low input voltages. Please refer to “STATIC CHARACTERISTIC” sections for details.
6. 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.
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. To fulfill requirements of the latest ErP regulation for lighting fixtures, this LED driver can only be used behind a switch without permanently connected to the mains.
9. This series meets the typical life expectancy of >50,000 hours of operation when Tcase, particularly tc point (or TMP, per DLC), is about 75℃ or less.
10. Please refer to the warranty statement on MEAN WELL's website at http://www.meanwell.com
11. 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).
12. For any application note and IP water proof function installation caution, please refer our user manual before using. https://www.meanwell.com/Upload/PDF/LED_EN.pdf

Technical drawings

LPF-40D-42 BLOCK DIAGRAM — BLOCK DIAGRAM

LPF-40D-42 DIMMING OPERATION — DIMMING OPERATION

LPF-40D-42 Illustration (page 5) — Illustration (page 5)

LPF-40D-42 OUTPUT LOAD vs TEMPERATURE — OUTPUT LOAD vs TEMPERATURE

LPF-40D-42 STATIC CHARACTERISTIC — STATIC CHARACTERISTIC

LPF-40D-42 TOTAL HARMONIC DISTORTION — TOTAL HARMONIC DISTORTION

LPF-40D-42 MECHANICAL SPECIFICATION — MECHANICAL SPECIFICATION

LPF-40D-42 Recommend Mounting Direction — Recommend Mounting Direction

Typical applications

LED panel lighting
LED downlight
LED decorative lighting
LED tunnel lighting
Moving sign

Downloads

Certificates5

UL Certificate (LPF-40D)(EN) PDF Download

CB Certificate (LPF-40D)(EN) PDF Download

EMC Certificate (LPF-40D)(EN) PDF Download

ENEC Certificate (LPF-40D)(EN) PDF Download

PSE Certificate (LPF-40D)(EN) PDF Download

Test reports1

Test Report(LPF-40D-42)(EN) PDF Download

Catalogues1

Mean Well LED Driver Catalog PDF Download

FAQ

Can I use the LPF-40D-42 for a 42V constant-current LED sign module?

Yes, if the sign module is designed for constant-current operation within the 25.2-42V range and needs up to 0.96A. This driver provides 40.32W at 42V with built-in 3 in 1 dimming, so it fits dimmable 42V LED lighting loads within those limits.

Is this driver suitable for outdoor architectural lighting at 42V?

It can be used for outdoor architectural LED fixtures if the fixture is rated for 42V constant-current operation and no more than 40.32W. The IP67 waterproof rating and -40°C to +80°C case temperature (Tcase) rating support wet and exposed environments, with load derating at higher temperatures.

Can the LPF-40D-42 run dimmable LED lighting for display or signage projects?

Yes, it is intended for dimmable constant-current LED loads and includes built-in 3 in 1 dimming. The output is 42V at 0.96A, so the lighting load needs to fall within the 25.2-42V constant-current range and stay under 40.32W.

How much 42V LED strip or linear lighting can this driver support?

The maximum load is 40.32W. As a constant-current driver, it suits strips or linear lights designed for 0.96A constant current with a voltage within 25.2-42V, so check your load's rated current and voltage rather than sizing by watts per meter.

What is the difference between the LPF-40D-42 and the other LPF-40D models?

Within the LPF-40D series, the dimmable 40W models are 12V 40.08W 3.34A, 15V 40.08W 2.67A, 20V 40W 2A, 24V 40.08W 1.67A, 30V 40.2W 1.34A, 36V 40.32W 1.12A, 42V 40.32W 0.96A, 48V 40.32W 0.84A, and 54V 41.04W 0.76A. The LPF-40D-42 version is the 42V option in that group.

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Mean Well LPF-40D-42 Power Supply 40W 42V - Dimmable 960mA

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