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Mean Well LDH-45B-350DA DC/DC LED Driver CC 350mA - Step-up
Overview
LDH-45B-350DA 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 I use the LDH-45B-350DA for LED downlights that need a 350mA constant current driver?
Yes, this model is built for constant current LED loads at 350mA, which is a common requirement for LED downlights. The connected load needs to operate within the 36-126V constant current output range, and the total load must stay within the 44.1W rating.
Is this driver suitable for constant current LED signage modules?
It can be a fit for signage modules when the module string is designed for 350mA constant current operation. This is not a constant voltage driver, so the LED load must match the 36-126V CC range rather than a fixed voltage output.
Can the LDH-45B-350DA run a small high-voltage LED array?
Yes, it is intended for constant current LED arrays that need 350mA and fall within the 36-126V output range. Its step-up design and 126V maximum output make it more suitable for higher-voltage LED strings than lower-voltage-only CC drivers.
Is this a good choice for sealed or exposed lighting locations?
The datasheet does not list an IP or waterproof rating, so in exposed locations the driver must be protected by a sealed fixture; humidity is rated 20-90% RH non-condensing. It is rated for operation from -40°C to +70°C (refer to the derating curve), which supports use across a wide temperature range.
How do I know whether my LED load is compatible with this 350mA driver?
The key compatibility check is that your LED load must require 350mA constant current and fall within the 36-126V CC output range. The number of LEDs depends on each LED's forward voltage, so compatibility is based on the total forward voltage of the array rather than a fixed LED count.
What is the difference between the LDH-45B-350 family versions?
In the LDH-45B-350 group, LDH-45B-350 and LDH-45B-350W are both 350mA, 21-126V, 44.1W models, while LDH-45B-350DA and LDH-45B-350WDA are 350mA, 36-126V, 44.1W models. The spec split is the CC range and the physical style noted in the model suffix, while the output current and power stay the same within the group.
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