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Mean Well LDH-45B-350WDA DC/DC LED Driver CC 350mA - Step-up
Overview
LDH-45B-350WDA is the model of this series: rated current 350mA, rated power 44.1W, typical efficiency 93%.
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
- 350mA
- CURRENT ACCURACY(Typ.)
- ±5% at 24VDC input
- VOLTAGE RANGE Non-DALINote.2
- 21~126VDC
- VOLTAGE RANGE DALINote.2
- 36~126VDC
- NO LOAD OUTPUT VOLTAGE(max.)
- 146V
- RATED POWER
- 44.1W
- RIPPLE & NOISE (max.)Note.3
- 2.5Vp-p
INPUT
- RATED VOLTAGE
- 24VDC
- VOLTAGE RANGENote.2
- 18~32VDC
- EFFICIENCY (max.)
- 93%
- 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.)
- 146V 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-350WDA power a constant current LED downlight module?
Yes, if the downlight module is specified for 350mA constant current operation. The total LED forward voltage must stay within the 36-126V CC range, and the overall load must not exceed 44.1W.
Is this driver appropriate for LED signage modules that need 350mA?
Yes, it can be used with signage modules built for 350mA constant current input. It is not meant for constant voltage LED products, so the module string needs to match the 36-126V constant current output window.
Can I use this for a compact high-voltage LED array?
This model is suited to small constant current LED arrays that need 350mA and a relatively high combined forward voltage. With a 36-126V CC range and 44.1W rating, it is aimed at higher-voltage strings within that power limit.
Does the LDH-45B-350WDA handle cold, hot, or wet environments well?
The datasheet gives no IP or waterproof rating, and humidity is specified at 20-90% RH non-condensing, so it needs protection from water. It is specified for operation from -40°C to +70°C (refer to the derating curve), covering a wide temperature range.
How do I size the LED load for this driver?
Match it to a 350mA constant current LED load whose total forward voltage falls between 36V and 126V. The number of LEDs depends on each LED's forward voltage, so sizing should be based on the full array voltage rather than a preset LED quantity.
What separates the LDH-45B-350WDA from the other 350mA LDH-45B models?
The LDH-45B-350WDA and LDH-45B-350DA are both 350mA, 36-126V, 44.1W versions, while LDH-45B-350 and LDH-45B-350W are 350mA, 21-126V, 44.1W versions. Across these 350mA LDH-45B variants, the published differences are the CC voltage range and model style suffixes.
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