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Mean Well LDH-45B-350WDA DC/DC LED Driver CC 350mA - Step-up

constant currentstep uphigh efficiency up to 95%wire style

SKU LDH-45B-350WDA

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Overview

LDH-45B-350WDA is the model of this series: rated current 350mA, rated power 44.1W, typical efficiency 93%. Type WDA: Wire style, DALI dimming.

Features

DC/DC step-up converter
Constant current output : 350mA to 1050mA
Wide output LED string voltage up to 126VDC
High efficiency up to 95%
DALI dimming [(Blank)DA type or WDA type]
Protections: Short circuit / Over voltage / Under voltage
Cooling by free air convection
Fully encapsulated
3 years warranty

Specifications

LDH-45B-350WDASpecifications from the official datasheet (2024-10-16 edition)

OUTPUT

RATED CURRENT: 350mA
CURRENT ACCURACY(Typ.): ±5% at 24VDC input
VOLTAGE RANGE DALI^Note.2: 36~126VDC
NO LOAD OUTPUT VOLTAGE(max.): 146V
RATED POWER: 44.1W
RIPPLE & NOISE (max.)^Note.3: 2.5Vp-p

INPUT

RATED VOLTAGE: 24VDC
VOLTAGE RANGE^Note.2: 18~32VDC
EFFICIENCY (max.): 93%
DC CURRENT (Typ.): 2.1A

ANALOG DIMMING & ON/OFF CONTROL

DIM INPUT VOLTAGE RANGE: 0.25~1.3VDC
MAX OPERATION VOLTAGE: 8V; The output current remains constant when voltage changes from 1.3V to 8V

PROTECTION

SHORT CIRCUIT: Protection type : Power OFF and fuse open
OVER VOLTAGE (max.): 146V Protection type : Constant output voltage and shut off o/p current, recovers automatically after fault condition is removed

ENVIRONMENT

WORKING TEMP.: -40 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃)
VIBRATION: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes
SOLDERING TEMPERATURE: Wave soldering: 265℃,5s (max.); Manual soldering: 390℃,3s (max.)

SAFETY & EMC

SAFETY STANDARDS: LVD BS EN/EN61347-1, BS EN/EN61347-2-13,EAC TP TC 004 approved
EMC EMISSION: Compliance to BS EN/EN55015;EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61547,BS EN/EN61000-4-2,3,4,6,8; light industry level;EAC TP TC 020

OTHERS

MTBF: 12195.2K hrs min. Telcordia SR-332 (Bellcore) ; 1179.3K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 75*53*22.7mm (L*W*H)
PACKING: 138g;100pcs/14.8Kg/0.83CUFT[(Blank) type or (Blank) DA type],1.04CUFT(W type or WDA type)

MODEL ENCODING

A: 9~18VDC input range
B: 18~32VDC input range
Blank: PIN style, PWM+analog dimming
W: Wire style, PWM+analog dimming
DA: PIN style, DALI dimming
WDA (this model): Wire style, DALI dimming

Test conditions and notes3

1. All parameters are specified at normal input(12VDC,24VDC), rated load, 25℃ 70% RH ambient.
2. WDA type output voltage must step up by 12 Volts from input DC voltage.
3. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf parallel capacitor.

Technical drawings

LDH-45B-350WDA Mechanical Specification — Mechanical Specification

LDH-45B-350WDA Standard Application — Standard Application

LDH-45B-350WDA Efficiency VS Output Voltage(Number — Efficiency VS Output Voltage(Number

LDH-45B-350WDA Application Notes of EMC — Application Notes of EMC

Downloads

Datasheet1

LDH-45B-350WDA datasheetLDH-45-spec.pdf · 2024-10-16 edition PDF Download

Certificates3

Mean Well LDH-45-EMC Certificate PDF Download

Mean Well LDH-45(DA)-CE-dec Certificate PDF Download

Mean Well LDH-45(DA)-UK-dec Certificate PDF Download

Test reports1

Mean Well LDH-45B-350 Test Report PDF Download

Catalogues1

Mean Well LED Driver Catalog PDF Download

FAQ

Can the LDH-45B-350WDA power a constant current LED downlight module?

Yes, if the downlight module is specified for 350mA constant current operation. The total LED forward voltage must stay within the 36-126V CC range, and the overall load must not exceed 44.1W.

Is this driver appropriate for LED signage modules that need 350mA?

Yes, it can be used with signage modules built for 350mA constant current input. It is not meant for constant voltage LED products, so the module string needs to match the 36-126V constant current output window.

Can I use this for a compact high-voltage LED array?

This model is suited to small constant current LED arrays that need 350mA and a relatively high combined forward voltage. With a 36-126V CC range and 44.1W rating, it is aimed at higher-voltage strings within that power limit.

Does the LDH-45B-350WDA handle cold, hot, or wet environments well?

The datasheet gives no IP or waterproof rating, and humidity is specified at 20-90% RH non-condensing, so it needs protection from water. It is specified for operation from -40°C to +70°C (refer to the derating curve), covering a wide temperature range.

How do I size the LED load for this driver?

Match it to a 350mA constant current LED load whose total forward voltage falls between 36V and 126V. The number of LEDs depends on each LED's forward voltage, so sizing should be based on the full array voltage rather than a preset LED quantity.

What separates the LDH-45B-350WDA from the other 350mA LDH-45B models?

The LDH-45B-350WDA and LDH-45B-350DA are both 350mA, 36-126V, 44.1W versions, while LDH-45B-350 and LDH-45B-350W are 350mA, 21-126V, 44.1W versions. Across these 350mA LDH-45B variants, the published differences are the CC voltage range and model style suffixes.

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Model	Power	Voltage	Current	IP Rating
Mean Well LDH-45B-700WDA DC/DC LED Driver CC 700mA - Step-up	44.8W	64V	0.7A	IP67	View
Mean Well LDH-45B-700W DC/DC LED Driver CC 700mA - Step-up	44.8W	64V	0.7A	IP67	View
Mean Well LDH-45B-700DA DC/DC LED Driver CC 700mA - Step-up	44.8W	64V	0.7A	IP67	View
Mean Well LDH-45B-700 DC/DC LED Driver CC 700mA - Step-up	44.8W	64V	0.7A	IP67	View
Mean Well LDH-45B-500WDA DC/DC LED Driver CC 500mA - Step-up	43W	86V	0.5A	IP67	View
Mean Well LDH-45B-500W DC/DC LED Driver CC 500mA - Step-up	43W	86V	0.5A	IP67	View
Mean Well LDH-45B-500DA DC/DC LED Driver CC 500mA - Step-up	43W	86V	0.5A	IP67	View
Mean Well LDH-45B-500 DC/DC LED Driver CC 500mA - Step-up	43W	86V	0.5A	IP67	View
Mean Well LDH-45B-350W DC/DC LED Driver CC 350mA - Step-up	44.1W	126V	0.35A	IP67	View
Mean Well LDH-45B-350DA DC/DC LED Driver CC 350mA - Step-up	44.1W	126V	0.35A	IP67	View
Mean Well LDH-45B-350 DC/DC LED Driver CC 350mA - Step-up	44.1W	126V	0.35A	IP67	View
Mean Well LDH-45B-1050WDA DC/DC LED Driver CC 1050mA - Step-up	45.15W	43V	1.05A	IP67	View
Mean Well LDH-45B-1050W DC/DC LED Driver CC 1050mA - Step-up	45.15W	43V	1.05A	IP67	View
Mean Well LDH-45B-1050DA DC/DC LED Driver CC 1050mA - Step-up	45.15W	43V	1.05A	IP67	View
Mean Well LDH-45B-1050 DC/DC LED Driver CC 1050mA - Step-up	45.15W	43V	1.05A	IP67	View

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Mean Well LDH-45B-350WDA DC/DC LED Driver CC 350mA - Step-up

Overview

Features

Specifications

OUTPUT

INPUT

ANALOG DIMMING & ON/OFF CONTROL

PROTECTION

ENVIRONMENT

SAFETY & EMC

OTHERS

MODEL ENCODING

Technical drawings

Downloads

Datasheet1

Certificates3

Test reports1

Catalogues1

FAQ

Payment & Security

Other LDH-45B Models

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Mean Well LDH-45B-350WDA DC/DC LED Driver CC 350mA - Step-up

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