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Mean Well

Mean Well LDD-350LW DC/DC LED Driver CC 350mA - Step-down

constant currentstep downhigh efficiency up to 97%IP67wire style
SKU LDD-350LW
$5.75 USD
Shipping calculated at checkout.
In stock
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Overview

LDD-350LW 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

LDD-350LWSpecifications from the official datasheet (2026-09-15 edition)

OUTPUT

CURRENT RANGE
350mA
VOLTAGE RANGENote.4
2 ~ 32VDC for LDD-300~700L/LW ; 2~ 28VDC for LDD-300~700LS
CURRENT ACCURACY (Typ.)
±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
350mA
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 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-300~700L/LW ; 20% ~ 85% RH non-condensing for LDD-300~700LS
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
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. 1.All parameters are specified at normal input(24VDC), rated load, 25℃ 70% RH ambient.
  2. 2.Ripple & noise are measured at 20MHz by using a 12" twisted pair terminated with a 0.1uf capacitor.
  3. 3.Test condition: 24VDC input.
  4. 4.Output voltage will always step down by 3 volts from input DC voltage.
  5. 5.The output of LDD-L should not be connected to the input of the same unit or output from other sources.

Technical drawings

LDD-350LW Features
Features
LDD-350LW Mechanical Specification
Mechanical Specification
LDD-350LW Recommended PCB layout (for LDD-300~700LS)
Recommended PCB layout (for LDD-300~700LS)
LDD-350LW Mechanical Specification
Mechanical Specification
LDD-350LW Derating Curve
Derating Curve
LDD-350LW Analog Dimming Control for 1000mA
Analog Dimming Control for 1000mA
LDD-350LW Efficiency VS Output Voltage(Number
Efficiency VS Output Voltage(Number
LDD-350LW Packing
Packing
LDD-350LW LDD-LS
LDD-LS
LDD-350LW LDD-LS (2)
LDD-LS (2)
LDD-350LW LDD-1000L
LDD-1000L
LDD-350LW Standard Tube Packing
Standard Tube Packing

Downloads

FAQ

Can the LDD-350LW be used for a low-voltage LED downlight module?

Yes, it is suited to constant current LED downlight loads at 350mA when the LED string stays within the 2-32V output range. Because it is a step-down driver, the output voltage stays about 3V below the 9-36VDC input voltage.

Is this driver suitable for compact LED signage modules?

It can be used with constant current signage modules that require 350mA. Because its constant current output range is 2-32V, it is intended for lower-voltage LED strings rather than long series arrays.

Can I use the LDD-350LW for a small custom LED array in a tight space?

Yes, this model is physically compact at 22.6 × 9.9 × 8.9 mm, which helps in small housings. The LED array still needs to be a 350mA constant current load with a combined forward voltage within 2-32V.

How do I check LED compatibility for the LDD-350LW?

The key match points are 350mA constant current and a 2-32V output range. The number of LEDs depends on each LED forward voltage, so this should be evaluated by total forward voltage instead of a fixed LED quantity.

Is the LDD-350LW acceptable for damp or outdoor installations?

This wire-style driver is fully encapsulated to IP67 level and operates from -40°C to +85°C. That makes it appropriate for sealed LED systems in wet or dusty conditions, provided the LED load stays within its 350mA, 2-32V output.

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Mean Well LDD-350LW DC/DC LED Driver CC 350mA - Step-down
Mean Well

Mean Well LDD-350LW DC/DC LED Driver CC 350mA - Step-down

$5.75 USD

LDD-350LW 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
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