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Mean Well LDH-45A-500DA DC/DC LED Driver CC 500mA - Step-up

constant currentstep uphigh efficiency up to 95%pin style
SKU LDH-45A-500DA
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Overview

LDH-45A-500DA is the model of this series: rated current 500mA, rated power 43W, typical efficiency 90%. Type DA: PIN 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-500DASpecifications from the official datasheet (2024-10-16 edition)

OUTPUT

RATED CURRENT
500mA
CURRENT ACCURACY(Typ.)
±5% at 12VDC input
VOLTAGE RANGE DALINote.2
24~86VDC
NO LOAD OUTPUT VOLTAGE(max.)
100V
RATED POWER
43W
RIPPLE & NOISE (max.)Note.3
2.5Vp-p

INPUT

RATED VOLTAGE
12VDC
VOLTAGE RANGENote.2
9~18VDC
EFFICIENCY (max.)
90%
DC CURRENT (Typ.)
4.1A

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.)
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) DA 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 (this model)
PIN style, DALI dimming
WDA
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. (Blank)DA 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-500DA Mechanical Specification
Mechanical Specification
LDH-45A-500DA Standard Application
Standard Application
LDH-45A-500DA Efficiency VS Output Voltage(Number
Efficiency VS Output Voltage(Number
LDH-45A-500DA Application Notes of EMC
Application Notes of EMC

Downloads

FAQ

Can I use the LDH-45A-500DA for a 500mA LED downlight with a higher-voltage LED string?

Yes, if the downlight is a constant current 500mA load and its total LED forward voltage stays within 24-86V. This model is better suited to higher-voltage strings than lower-voltage constant current loads because its regulated range starts at 24V. The connected load must also stay within 43W.

Is this driver a fit for outdoor signage modules that need 500mA constant current?

It can be a fit for constant current signage modules operating at 500mA with a total forward voltage in the 24-86V range. The -40°C to +70°C operating range (refer to the derating curve) covers wide temperature swings, but no IP or waterproof rating is given, so the sign must protect it from water. It should not be used where the LED product expects fixed-voltage output.

Can the LDH-45A-500DA power a compact LED array that needs a boosted output voltage?

Yes, this is a step-up constant current driver with 500mA output, up to 86V output voltage, and a 24-86V constant current range. It works for small LED arrays that need a higher LED string voltage while staying inside the 43W limit. It is intended for constant current loads, not fixed-voltage LED assemblies.

How should I verify LED compatibility with the LDH-45A-500DA?

Your LED load must require constant current at 500mA, and the total forward voltage of the LED string must fall within 24-86V. The number of LEDs depends on each LED's forward voltage, so compatibility is based on the summed forward voltage rather than a fixed LED quantity. The driver is rated for 43W maximum.

Is the LDH-45A-500DA suitable for wet and temperature-variable locations?

It operates from -40°C to +70°C (refer to the derating curve) at 20-90% RH non-condensing, so it handles variable temperatures, but the datasheet gives no IP or waterproof rating. In wet locations it must be housed so that water and condensation cannot reach it. The housing dimensions are 75.0 × 53.0 × 22.7 mm.

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Mean Well LDH-45A-500DA DC/DC LED Driver CC 500mA - Step-up
Mean Well

Mean Well LDH-45A-500DA DC/DC LED Driver CC 500mA - Step-up

Log in to see price

LDH-45A-500DA is the model of this series: rated current 500mA, rated power 43W, typical efficiency 90%. Type DA: PIN 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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