Name: MEAN WELL LDD-L series: DC/DC step-down constant-current LED driver - LDD-300LW
Brand: MEAN WELL
SKU: LDD-300LW
Price: 16.26 USD
Availability: InStock

MEAN WELL LDD-L series: DC/DC step-down constant-current LED driver - LDD-300LW

Share
- WhatsApp
- Deel
- X
- Pin it
- Messenger
- Email

Description

LDD-300LW — Constant-current DC/DC LED driver

MEAN WELL LDD-300LW is a 300 mA constant-current DC/DC step-down LED driver in wire style. It accepts 9–36 VDC and drives an LED string within 2–32 VDC, with the output at least 3 V below the input. PWM control provides dimming and remote on/off.

Download MEAN WELL LDD-L Datasheet (PDF)

LDD-L specifications and drawings are in catalog pages 1–9. Follow the applicable model and construction.

Output and input specifications

Parameter	Details
Complete model / construction	LDD-300LW; LDD-L series; W suffix = wire style.
Constant output current	300 mA. Match the LED module’s current rating to this fixed-current driver.
LED output-voltage window	2–32 VDC. Select the total LED forward voltage within this window and at least 3 V below the DC input; the module steps down rather than boosts the input.
DC input range	9–36 VDC.
Typical current accuracy	±5% at 24 VDC input.
Maximum ripple and noise	150 mVp-p; measured with 20 MHz bandwidth and a 12-inch twisted pair terminated by a 0.1 µF capacitor.
Switching frequency	40–1,000 kHz.
Maximum external capacitive load	2.2 µF.
Maximum efficiency	95% at full load and 24 VDC or 36 VDC input.
Full-load input current	300 mA at 24 VDC input; catalog test condition.
No-load input current	5 mA.
Input filter	Capacitor filter; built-in EMI filtering. The catalog specifies BS EN/EN 55015 and FCC Part 15 compliance without an additional input filter or capacitors.
Reference measurement conditions	Unless otherwise stated: 24 VDC input, rated load, 25°C ambient and 70% RH.
Efficiency curves	Efficiency varies with input voltage and the LED string voltage. Catalog examples use 3 V forward voltage per LED at 12, 24 and 36 VDC input; these examples do not extend this model’s specified input or output limits.

Dimming and control

Parameter	Details
Control reference	DIM voltage is measured relative to −Vin. Leave DIM open if unused. Do not connect −Vin to −Vout.
PWM dimming and on/off	High level above 3.5 V and up to 8 V, or an open control, enables output. A level below 0.5 V or a short to −Vin turns output off. PWM frequency: 100 Hz–1 kHz.
PWM output characteristic	During PWM dimming the output current becomes a pulsed waveform. The catalog duty-cycle/current plot is approximately proportional over 0–100% duty, with ±3% typical tolerance.
Shutdown input current	1 mA maximum with PWM dimming OFF at 24 VDC input.

Protection and environment

Parameter	Details
Short-circuit protection	Output is regulated at rated current during a short circuit. The fault condition can be sustained, and normal operation recovers automatically after the fault is removed.
Overtemperature protection	The main control IC detects a junction temperature of typically 150°C and shuts down; output recovers automatically after the temperature falls. This is an IC junction threshold, not an ambient-temperature rating.
Cooling and ambient limits	Free-air convection. The derating chart permits full load from −40°C to +85°C and ends at that temperature. Keep the operating case temperature within its separate limit.
Maximum operating case temperature	100°C.
Working humidity	20–90% RH, non-condensing.
Storage conditions	−55°C to +125°C; 10–95% RH.
Temperature coefficient	±0.03%/°C.
Vibration	10–500 Hz, 2G; 10 minutes per cycle, 60 minutes each along X, Y and Z axes.

Connections and installation

Parameter	Details
Dimensions	22.6 × 9.9 × 8.9 mm (L × W × H), as specified for this construction.
Unit mass	7.3 g, catalog weight per unit; not the gross weight of a packing tube or carton.
Power and control connections	Bottom-view positions: 1 = +Vin (red); 3 = PWM DIM (white); 4 = −Vin (black); 5 = −Vout (blue); 6 = +Vout (yellow). Connect LEDs between +Vout and −Vout. Do not connect −Vin to −Vout.
Wire specification	All leads are UL3385, 22 AWG. The drawing specifies 100 ±10 mm lead length and 5 ±2 mm stripped ends.
Encapsulation	Epoxy potting, UL94-V0; fully encapsulated IP67 construction as specified for pin and wire styles.
DC wiring restriction	Do not connect the output to the input of the same unit or to the output of another source. Keep the LED output return separate from −Vin.

Standards and reference information

Parameter	Details
Safety / EMC references	EAC TP TC 020/2011 approval. Emissions: BS EN/EN 55015, FCC Part 15 Class B and EAC TP TC 020. Immunity: BS EN/EN 61000-4-2, -3, -4, -6 and -8, light-industry level, criterion A; EAC TP TC 020.
MTBF	At least 1,000,000 hours according to MIL-HDBK-217F at 25°C; a reliability calculation, not a guaranteed operating lifetime.
Applications and warranty	Designed to drive illumination LEDs. The manufacturer’s catalog states a 3-year warranty; applicable manufacturer terms govern this statement.
Packing reference	Box: 48 units, 430 g gross; carton: up to 576 units, 5.96 kg gross. The shown box is 220 × 195 × 45 mm. Outer carton reference: 620 × 230 × 230 mm. Packing dimensions and gross masses are separate from the product dimensions and unit mass.