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Mean Well LDH-45B-350 DC/DC LED Driver CC 350mA - Step-up
Overview
LDH-45B-350 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-350 for a 350mA LED downlight?
Yes, if the downlight is designed for constant current operation at 350mA and its total LED forward voltage stays within the 21-126V CC range. This is a constant current driver and should not be used in place of a constant voltage supply. The driver is rated for 44.1W.
Is this driver appropriate for signage modules that run at 350mA?
It can be appropriate for signage modules that require 350mA constant current and whose combined forward voltage is within 21-126V. The wide CC range makes it suitable for longer or higher-voltage constant current LED strings. It is not intended for constant voltage signage products.
Can the LDH-45B-350 run a small LED array with a higher total forward voltage?
Yes, this step-up constant current driver provides 350mA across a 21-126V CC range, which suits higher-voltage LED arrays within that window. The 44.1W rating should also match the array requirement. The exact LED count depends on the forward voltage of each LED.
Is this model suitable for exposed or demanding environments?
The datasheet does not list an IP or waterproof rating, so protection against dust and water has to come from the fixture; humidity is rated 20-90% RH non-condensing. It is specified for operation from -40°C to +70°C (refer to the derating curve). That makes it a practical option for fixtures facing wide temperature swings when it is kept dry.
How do I confirm compatibility with my LED string?
Your LED load must be rated for 350mA constant current, and the total forward voltage must stay within the 21-126V CC output range. The number of LEDs depends on each LED's forward voltage rather than a fixed count. A constant voltage LED load is not compatible with this driver.
How does the LDH-45B-350 compare with the other 350mA LDH options in this family?
At 350mA, the LDH-45A-350 variants are 30.1W with a 12-86V or 24-86V CC range, and the LDH-45B-350 variants are 44.1W with a 21-126V or 36-126V CC range. Within the 45B group, the LDH-45B-350 and LDH-45B-350W use 21-126V, while the LDH-45B-350DA and LDH-45B-350WDA use 36-126V. The W versions are wire style, and the non-W versions are pin style.
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