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Mean Well LDH-45B-500 DC/DC LED Driver CC 500mA - Step-up
Overview
LDH-45B-500 is the model of this series: rated current 500mA, rated power 43W, typical efficiency 94%.
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%
- PWM + analog dimming and remote ON/OFF control [(Blank) type or W type]
- 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
OUTPUT
- RATED CURRENT
- 500mA
- CURRENT ACCURACY(Typ.)
- ±5% at 24VDC input
- VOLTAGE RANGE Non-DALINote.2
- 21~86VDC
- VOLTAGE RANGE DALINote.2
- 36~86VDC
- NO LOAD OUTPUT VOLTAGE(max.)
- 100V
- RATED POWER
- 43W
- RIPPLE & NOISE (max.)Note.3
- 1.7Vp-p
INPUT
- RATED VOLTAGE
- 24VDC
- VOLTAGE RANGENote.2
- 18~32VDC
- EFFICIENCY (max.)
- 94%
- DC CURRENT (Typ.)
- 2.1A
PWM DIMMING & ON/OFF CONTROL
- REMOTE ON/OFF
- Leave open if not used Power ON with dimming: PWM signal >2~8VDC or open circuit, between PWM DIM and DIM- Power OFF : PWM signal <0.5VDC or short or PWM duty is equal to 0%, between PWM DIM and DIM-
- PWM DIMMING FREQUENCY
- 1K~10KHz
- QUIESCENT INPUT CURRENT IN SHUTDOWN MODE(Typ.)
- 7mA when PWM dimming OFF
ANALOG DIMMING & ON/OFF CONTROL
- REMOTE ON/OFF
- Leave open if not used Power on with dimming: DC input >0.25~8VDC or open circuit, between Analog DIM and DIM- Power off : DC input <0.2VDC or short, between Analog DIM and DIM-
- 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
- QUIESCENT INPUT CURRENT IN SHUTDOWN MODE(Typ.)
- 7mA when Analog dimming OFF
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)
Test conditions and notes3
- 1. All parameters are specified at normal input(12VDC,24VDC), rated load, 25℃ 70% RH ambient.
- 2. (Blank) type and W type output voltage must step up by 3 Volts from input DC voltage; (Blank)DA type and 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
Downloads
FAQ
Can I use the LDH-45B-500 for a 500mA LED downlight?
Yes, this driver is designed for constant current LED loads at 500mA, including downlights that require that drive current. The LED load must operate within the 21-86V CC range and stay within the 43W rating.
Will this driver work with constant current LED signage modules?
It can be used for signage modules when the LED module string is specified for 500mA constant current input. It is not a constant voltage unit, so the deciding factor is whether the total LED forward voltage is inside the 21-86V range.
Is the LDH-45B-500 suitable for a small LED array that needs more current than 350mA?
Yes, this model provides 500mA constant current instead of 350mA, which makes it a better fit for arrays designed around that higher drive current. The array still needs to match the 21-86V CC window and the 43W maximum power.
Can this driver be used where moisture, dust, or temperature swings are a concern?
The datasheet does not list an IP or waterproof rating, so moisture and dust protection must come from the fixture; humidity is specified at 20-90% RH non-condensing. It is rated for operation from -40°C to +70°C (refer to the derating curve), which supports use in both cold and hot conditions.
How do I determine LED compatibility for the LDH-45B-500?
Your LED load must require 500mA constant current and have a combined forward voltage within the 21-86V CC output range. The number of LEDs depends on each LED's forward voltage, so compatibility should be checked by total forward voltage, not by a fixed LED count.
How does the LDH-45B-500 compare with the other 500mA LDH-45B variants?
LDH-45B-500 and LDH-45B-500W are rated at 500mA, 21-86V, and 43W, while LDH-45B-500DA and LDH-45B-500WDA are rated at 500mA, 36-86V, and 43W. Within this subgroup, the output current and power are the same, while the CC range and suffix differ.
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