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Mean Well LDD-350HW DC/DC LED Driver CC 350mA - Step-down
Overview
LDD-350HW is the model of this series: typical efficiency 97% at full load and 36VDC/48VDC input for LDD-H/HW ; 96% at full load and 36VDC/48VDC input for LDD-HS.
Features
- DC/DC step-down converter
- Constant current output: 300mA to 1500mA
- Wide input voltage: 9 ~ 56VDC
- Wide output LED string voltage: 2 ~ 52VDC
- High efficiency up to 97%
- Built-in EMI filter, comply with BS EN/EN55015 and FCC part15 without additional input filter and capacitors
- Built-in PWM and remote ON/OFF control
- Protections: Short circuit / Over temperature
- Cooling by free air convection
- Fully encapsulated with IP67 level for pin and wire style
- Non-potted, optional conformal coating for SMD style (Order No.: LDD- 350-1000 HSC)
- Compact size
- Low cost, high reliability
- Suitable for driving illumination LED
- 3 years warranty
Specifications
OUTPUT
- CURRENT RANGE
- 350mA
- VOLTAGE RANGENote.4
- 2 ~ 52VDC
- CURRENT ACCURACY (Typ.)
- ±3% at 24VDC input ; ±4% at 48VDC input for LDD-H/HW ; ±5% for LDD-HS
- RIPPLE & NOISE(max.)Note.2
- 150mVp-p
- SWITCHING FREQENCY
- 40KHz ~ 1000KHz
- EXTERNAL CAPACITANCE LOAD (max.)
- 2.2uF
INPUT
- VOLTAGE RANGE
- 9 ~ 56VDC
- EFFICIENCY (max.)
- 97% at full load and 36VDC/48VDC input for LDD-H/HW ; 96% at full load and 36VDC/48VDC input for LDD-HS
- DC CURRENT Full loadNote.3
- 320mA
- DC CURRENT No load
- 5mA
- FILTER
- Capacitor
PWM DIMMING & ON/OFF CONTROL
- REMOTE ON/OFF
- Leave open if not use
- REMOTE ON/OFF
- Power ON with dimming: DIM ~ -Vin >2.5 ~ 6VDC or open circuit
- REMOTE ON/OFF
- Power OFF : DIM ~ -Vin < 0.8VDC or short
- PWM FREQUENCY
- 100 ~ 1KHz
- QUIESCENT INPUT CURRENT IN SHUTDOWN MODE(max.)
- 1mA at PWM dimming OFF and 24VDC input
PROTECTION
- SHORT CIRCUIT
- Regulated at rated output current Protection type: Can be continued, recovers automatically after fault condition is removed
- OVER TEMPERATURE
- Tj 150℃ typically(IC1) detect on main control IC Protection type : Shut down, recovers automatically after temperature goes down
ENVIRONMENT
- WORKING TEMP.
- -40 ~ + 85℃(Refer to derating curve)
- WORKING HUMIDITY
- 20% ~ 90% RH non-condensing for LDD-H/HW ; 20%~85% RH non-condensing for LDD-HS
- STORAGE TEMP., HUMIDITY
- -55 ~ +125℃, 10 ~ 95% RH
- TEMP. COEFFICIENT
- ±0.03% / ℃
- VIBRATION
- 10 ~ 500Hz, 2G 10min./1 cycle, period for 60min. each along X, Y, Z axes
- OPERATING CASE TEMP. (max.)
- 100℃
EMC
- SAFETY STANDARDS
- EAC TP TC 020/2011 approved
- EMC EMISSION
- Compliance to BS EN/EN55015, FCC part 15 class B, EAC TP TC 020
- EMC IMMUNITY
- Compliance to BS EN/EN61000-4-2,3,4,6,8, light industry level, criteria A, EAC TP TC 020
OTHERS
- MTBF
- 1000Khrs min. MIL-HDBK-217F (25℃)
- DIMENSION
- 31.8*20.3*12.2mm or 1.25"*0.8"*0.48" inch (L*W*H) for LDD-H/HW ; 31.8*20.3*11.4mm or 1.25"*0.8"*0.45" inch (L*W*H) for LDD-HS
- WEIGHT
- LDD-H:15.6g ; LDD-HW:18g ; LDD-HS:12.8g
- POTTING MATERIAL
- Expoxy(UL94-V0) for LDD-H/HW ; without potted for LDD-HS
Test conditions and notes5
- 1.All parameters are specified at normal input(48VDC), rated load, 25℃ 70% RH ambient.
- 2.Ripple & noise are measured at 20MHz by using a 12" twisted pair terminated with a 0.1uf capacitor.
- 3.Test condition: 48VDC input.
- 4.Output voltage will always step down by 3 volts from input DC voltage.
- 5.The output of LDD-H should not be connected to the input of the same unit or output from other sources.
Technical drawings
Downloads
FAQ
Can I use the LDD-350HW for a 350mA LED downlight with a higher forward voltage string?
Yes, this model is useful for 350mA constant current downlight loads that need a wide voltage window. Its LED string voltage range is 2-52VDC, and the output always steps down about 3V from the 9-56VDC input, so supply a voltage above the string voltage.
Is the LDD-350HW a good fit for LED signage modules?
It can be used for signage modules that are specified for 350mA constant current operation. The load needs to remain within the 2-52V constant current range, and this driver should not be used as a constant voltage source.
Can this model power a small LED array in a compact housing?
Yes, it is designed for compact constant current LED systems and measures 31.8 × 20.3 × 12.2 mm. The LED array must be a 350mA load with a total forward voltage inside 2-52V.
How do I size LED strings for the LDD-350HW?
This driver delivers 350mA constant current over a 2-52V range. The number of LEDs depends on each LED's forward voltage, so you size the string by total forward voltage rather than assuming a specific LED count.
Can the LDD-350HW handle outdoor or industrial temperature swings?
It is fully encapsulated to IP67 and has an operating temperature range of -40°C to +85°C (refer to the derating curve). That makes it suitable for sealed LED assemblies that may see water exposure, dust, and wide temperature variation.
How does the LDD-350HW differ from other 350mA LDD options?
In the LDD-H series, the LDD-350H, LDD-350HS, and LDD-350HW all deliver 350mA over a 2-52V range. The H is pin style and the HW wire style, both epoxy-encapsulated to IP67 with up to 97% efficiency; the HS is a non-potted SMD style with up to 96% efficiency. The LDD-350HW is the wire-style version with UL3385 22AWG leads.
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