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Mean Well

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

constant currentstep uphigh efficiency up to 95%wire style
SKU LDH-45A-350WDA
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Overview

LDH-45A-350WDA is the model of this series: rated current 350mA, rated power 30.1W, typical efficiency 91%. 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-45A-350WDASpecifications from the official datasheet (2024-10-16 edition)

OUTPUT

RATED CURRENT
350mA
CURRENT ACCURACY(Typ.)
±5% at 12VDC input
VOLTAGE RANGE DALINote.2
24~86VDC
NO LOAD OUTPUT VOLTAGE(max.)
100V
RATED POWER
30.1W
RIPPLE & NOISE (max.)Note.3
2.5Vp-p

INPUT

RATED VOLTAGE
12VDC
VOLTAGE RANGENote.2
9~18VDC
EFFICIENCY (max.)
91%
DC CURRENT (Typ.)
2.8A

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.)
100V 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. 1. All parameters are specified at normal input(12VDC,24VDC), rated load, 25℃ 70% RH ambient.
  2. 2. WDA type output voltage must step up by 12 Volts from input DC voltage.
  3. 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-45A-350WDA Mechanical Specification
Mechanical Specification
LDH-45A-350WDA Standard Application
Standard Application
LDH-45A-350WDA Efficiency VS Output Voltage(Number
Efficiency VS Output Voltage(Number
LDH-45A-350WDA Application Notes of EMC
Application Notes of EMC

Downloads

FAQ

Can I use the LDH-45A-350WDA for 350mA LED downlights with a longer series string?

Yes, if the downlight uses constant current at 350mA and the total LED forward voltage stays within the 24-86V constant current range. This model is suited to higher-voltage LED strings because its regulated output starts at 24V and goes up to 86V. The connected load also needs to stay within 30.1W.

Is this a good driver for constant current signage modules in a sealed outdoor housing?

It can be used for constant current signage modules that require 350mA and fall within the 24-86V output range. The datasheet gives no IP or waterproof rating, so the sealed housing must keep moisture out, and the -40°C to +70°C operating range (refer to the derating curve) covers wide temperature swings. It is not intended for fixed-voltage LED products.

Can the LDH-45A-350WDA run a small LED array that needs more than a low string voltage?

Yes, this step-up constant current driver is intended for 350mA LED arrays whose total forward voltage sits in the 24-86V range. That makes it better suited to higher-voltage arrays than lower-voltage constant current strings. The array must also remain within the 30.1W rating.

What matters most when checking LED compatibility with the LDH-45A-350WDA?

The LED load must be a constant current load rated for 350mA, and its total forward voltage must fit the 24-86V constant current range. The number of LEDs depends on each LED's forward voltage, so compatibility is based on total string voltage rather than a set LED count. The driver's maximum output voltage is 86V and its power rating is 30.1W.

Will this driver handle cold, hot, or wet environments for LED assemblies?

It operates from -40°C to +70°C (refer to the derating curve) at 20-90% RH non-condensing, so it handles cold and hot ambients. The datasheet gives no IP or waterproof rating, so in wet locations it must be protected by the LED assembly's housing. Its compact dimensions are 75.0 × 53.0 × 22.7 mm.

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

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

Log in to see price

LDH-45A-350WDA is the model of this series: rated current 350mA, rated power 30.1W, typical efficiency 91%. 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
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