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Mean Well LDH-45B-350W DC/DC LED Driver CC 350mA - Step-up
Overview
LDH-45B-350W 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-350W for a 350mA LED downlight array?
Yes, this driver is intended for constant current LED loads at 350mA, including downlight arrays that match that drive current. The LED load must operate within the 21-126V constant current range and remain within the 44.1W power rating.
Will this work for constant current LED signage lighting?
It can work for signage modules if the modules are designed for 350mA constant current operation. Since this unit is a constant current driver rather than a constant voltage supply, the total LED forward voltage needs to land inside the 21-126V CC range.
Is the LDH-45B-350W suitable for a small LED array with a wide forward-voltage range?
This model is useful for 350mA LED arrays because it supports a broad 21-126V constant current window. That wide range gives more flexibility across different array forward voltages, provided the total load stays within 44.1W.
Can this driver be used in outdoor or damp locations?
The datasheet gives no IP or waterproof rating, and humidity is specified at 20-90% RH non-condensing, so it must be protected from water by the fixture. The operating temperature range of -40°C to +70°C (refer to the derating curve) supports use in demanding temperature conditions.
How should I check compatibility with my LED load?
Your LEDs must be a 350mA constant current load with a total forward voltage that falls within the 21-126V CC range. The number of LEDs will depend on each LED's forward voltage, so there is no single fixed LED count for this driver.
How does the LDH-45B-350W compare with the other 350mA LDH-45B versions?
LDH-45B-350 and LDH-45B-350W are both rated at 350mA, 21-126V, and 44.1W, while LDH-45B-350DA and LDH-45B-350WDA are rated at 350mA, 36-126V, and 44.1W. The main factual differences in this subgroup are the CC voltage range and the version suffix, not the nominal power.
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