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Mean Well LDH-45B-1050DA DC/DC LED Driver CC 1050mA - Step-up
Overview
LDH-45B-1050DA is the model of this series: rated current 1050mA, rated power 45.15W, typical efficiency 95%.
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
- 1050mA
- CURRENT ACCURACY(Typ.)
- ±5% at 24VDC input
- VOLTAGE RANGE Non-DALINote.2
- 21~43VDC
- VOLTAGE RANGE DALINote.2
- 36~43VDC
- NO LOAD OUTPUT VOLTAGE(max.)
- 50V
- RATED POWER
- 45.15W
- RIPPLE & NOISE (max.)Note.3
- 1.2Vp-p
INPUT
- RATED VOLTAGE
- 24VDC
- VOLTAGE RANGENote.2
- 18~32VDC
- EFFICIENCY (max.)
- 95%
- DC CURRENT (Typ.)
- 2A
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.)
- 50V 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-1050DA for a 1050mA LED downlight with a higher forward-voltage string?
Yes, if the downlight is designed for constant current operation at 1050mA and its total forward voltage stays within the 36-43V CC range. This narrower range makes it better suited to higher-voltage LED loads than a wider-range model. It is not intended for constant voltage LED products.
Will this work for signage modules that need 1050mA constant current?
It can, provided the signage module is specified for 1050mA constant current input and operates within the 36-43V constant current range. This driver is rated at 45.15W and should be matched to a load within that output window. It should not be used where the LED module expects constant voltage power.
Is the LDH-45B-1050DA suitable for a small LED array with a tight voltage requirement?
Yes, this model is intended for constant current LED arrays at 1050mA where the total forward voltage falls between 36V and 43V. Because the CC range starts at 36V, it fits higher-voltage arrays better than lower-voltage strings. The number of LEDs depends on each LED's forward voltage.
Can I use this driver in outdoor enclosures or harsh temperature conditions?
The datasheet does not give an IP or waterproof rating, so an outdoor enclosure must protect it from water and condensation (humidity rating 20-90% RH non-condensing). Its operating temperature range is -40°C to +70°C (refer to the derating curve), so it is suited to both cold and hot conditions within that span. The rest of the lighting system still has to provide the environmental protection.
How do I check LED compatibility for the LDH-45B-1050DA?
Your LED load needs to be a constant current load rated for 1050mA, and the driver's CC output range is 36-43V. The LED quantity depends on the forward voltage of each LED, so there is no fixed LED count. If the load is a constant voltage product, this driver is not compatible.
How is the LDH-45B-1050DA different from the other 1050mA LDH-45B models?
The LDH-45B-1050DA and LDH-45B-1050WDA are 45.15W, 1050mA models with a 36-43V CC range, while the LDH-45B-1050 and LDH-45B-1050W use a wider 21-43V CC range. The DA versions are better matched to higher-voltage LED loads because their constant current window starts at 36V. The non-W version is pin style, and the WDA version is wire style.
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