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Mean Well LDH-45B-1050W DC/DC LED Driver CC 1050mA - Step-up
Overview
LDH-45B-1050W 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 the LDH-45B-1050W run a 1050mA LED downlight?
Yes, if the downlight is built for constant current operation at 1050mA and its total LED forward voltage is within the 21-43V CC range. This is a constant current driver, not a constant voltage supply. Its maximum output power is 45.15W.
Is this a fit for 1050mA signage modules?
It is a fit when the signage module requires 1050mA constant current and the total forward voltage falls within 21-43V. Because this model regulates current rather than voltage, it should not be used for constant voltage signage products. The driver is rated up to 45.15W.
Can I use this driver for a compact LED array that needs boosted output voltage?
Yes, this step-up LED driver is designed for constant current output at 1050mA with a 21-43V CC range. It can support a compact LED array when the array's total forward voltage stays inside that range. The exact LED quantity depends on the forward voltage of each LED.
Is the LDH-45B-1050W suitable for outdoor lighting assemblies?
The datasheet does not list an IP or waterproof rating, so in outdoor assemblies the driver must be protected from water and condensation (humidity rating 20-90% RH non-condensing). The operating temperature range is -40°C to +70°C (refer to the derating curve), supporting use across a wide temperature span. Overall fixture suitability still depends on the rest of the assembly.
What should I verify before pairing this driver with an LED load?
Check that the LED load is designed for 1050mA constant current operation and that its total forward voltage is within the 21-43V CC output range. The number of LEDs depends on the forward voltage of each LED, so there is no universal LED count. Loads that require constant voltage are not compatible with this model.
How does the LDH-45B-1050W compare with the other 1050mA LDH-45B options?
The LDH-45B-1050W shares the same 45.15W rating and 21-43V CC range as the LDH-45B-1050, while the LDH-45B-1050DA and LDH-45B-1050WDA use a narrower 36-43V CC range. All four are 1050mA constant current models with a 43V output rating. The W versions are wire style, and the non-W versions are pin style.
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