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Mean Well LDD-300LW DC/DC LED Driver CC 300mA - Step-down
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LDD-300LW is the model of this series: typical efficiency 95% at full load and 24VDC/36VDC input for LDD-300~700L/LW ; 95% at full load and 24VDC input for LDD-300~700LS.
Features
- DC/DC step-down converter
- Constant current output: 300mA to 700mA
- Wide input voltage: 9 ~ 36VDC
- Wide output LED string voltage: 2 ~ 32VDC
- High efficiency up to 95%
- Built-in EMI filter, comply with BS EN/EN55015 and FCC part15 without additional input filter and capacitors
- Built-in PWM dimming 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
- Compact size
- Low cost, high reliability
- Suitable for driving illumination LED
- 3 years warranty
Specifications
OUTPUT
- CURRENT RANGE
- 300mA
- VOLTAGE RANGENote.4
- 2 ~ 32VDC for LDD-300~700L/LW ; 2~ 28VDC for LDD-300~700LS
- CURRENT ACCURACY (Typ.)
- Β±5% at 24VDC input
- RIPPLE & NOISE(max.)Note.2
- 150mVp-p
- SWITCHING FREQENCY
- 40KHz ~ 1000KHz
- EXTERNAL CAPACITANCE LOAD (max.)
- 2.2uF
INPUT
- VOLTAGE RANGE
- 9 ~ 36VDC for LDD-300~700L/LW ; 9~ 32VDC for LDD-300~700LS
- EFFICIENCY (max.)
- 95% at full load and 24VDC/36VDC input for LDD-300~700L/LW ; 95% at full load and 24VDC input for LDD-300~700LS
- DC CURRENT Full loadNote.3
- 300mA
- DC CURRENT No load
- 5mA
- FILTER
- Capacitor
PWM DIMMING & ON/OFF CONTROL
- REMOTE ON/OFF
- Leave open if not use Power ON with dimming: DIM ~ -Vin >3.5 ~ 8VDC or open circuit Power OFF : DIM ~ -Vin < 0.5VDC 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 150β typically(IC1) detect on main control IC Protection type : Shut down, recovers automatically after temperature goes down
ENVIRONMENT
- WORKING TEMP.
- -40 ~ + 85β(Refer to derating curve)
- WORKING HUMIDITY
- 20% ~ 90% RH non-condensing for LDD-300~700L/LW ; 20% ~ 85% RH non-condensing for LDD-300~700LS
- STORAGE TEMP., HUMIDITY
- -55 ~ +125β, 10 ~ 95% RH
- TEMP. COEFFICIENT
- Β±0.03% / β
- VIBRATION
- 10 ~ 500Hz, 2G 10min./1 cycle, period for 60min. each along X, Y, Z axes
- OPERATING CASE TEMP. (max.)
- 100β
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 (25β)
- DIMENSION
- 22.6*9.9*8.9mm or 0.89"*0.39"*0.35" inch (L*W*H) for LDD-300~700L/LW ; 25.4*10.5*9.3mm or 1"*0.4135"*0.366" inch (L*W*H) for LDD-300~700LS
- WEIGHT
- LDD-300~700L:4g ; LDD-300~700LW:7.3g ; LDD-300~700LS :3.4g
- POTTING MATERIAL
- Expoxy(UL94-V0) for LDD-300~700L/LW ; without potted for LDD-300~700LS
Test conditions and notes5
- 1.All parameters are specified at normal input(24VDC), rated load, 25β 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: 24VDC input.
- 4.Output voltage will always step down by 3 volts from input DC voltage.
- 5.The output of LDD-L should not be connected to the input of the same unit or output from other sources.
Technical drawings
Downloads
Certificates5
Catalogues1
FAQ
Can I use the LDD-300LW for compact low-current LED downlights?
Yes, if the downlight is a constant current design that requires 300mA and the LED load stays within the 2-32V CC range. Its compact 22.6 Γ 9.9 Γ 8.9 mm size suits small downlight assemblies. It should not be used where the fixture expects a constant voltage driver.
Is the LDD-300LW a good fit for very small LED arrays or indicator-style lighting?
It can be, because it provides 300mA constant current across a 2-32V range in a compact 22.6 Γ 9.9 Γ 8.9 mm package. That makes it useful for smaller constant current LED arrays where space is tight. The exact LED quantity depends on the forward voltage of each LED.
Can the LDD-300LW be used with small waterproof signage modules?
Yes, if the signage module assembly is specified for 300mA constant current and the total LED forward-voltage requirement falls between 2V and 32V. Its full encapsulation to IP67 level supports use in exposed or moisture-prone locations. It is not the right match for constant voltage signage modules.
How do I check whether my LEDs are compatible with the LDD-300LW?
The load must require 300mA constant current and have a total forward-voltage requirement within the 2-32V CC output range. The number of LEDs depends on each LED's forward voltage, so a fixed LED count should not be assumed. Since this is a step-down driver, the input source also needs to stay within the 9-36VDC range.
How is the LDD-300LW different from other 300mA LDD siblings?
Within the 300mA LDD-L family, the LDD-300L (pin style) and LDD-300LW (wire style) both have a 2-32V output range and 9-36VDC input, and both are epoxy encapsulated to IP67 level. The LDD-300LS (SMD style) has a 2-28V output range, 9-32VDC input and is not potted. The main differences are the constant current voltage range, input range and package style.
Is the LDD-300LW suitable for harsh temperature and moisture conditions?
Yes, it is fully encapsulated to IP67 level and has a working temperature range of -40Β°C to +85Β°C. Those specs support use in demanding environments when the full fixture or system is designed accordingly. Its 7.3 g weight and small body help where enclosure space is limited.
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