Mean Well LDD-350L Constant Current DC/DC LED Driver, 350 mA, 2-52 VDC, 18.2 W, PWM/Analog Dimming

Lighting designers and electronics engineers often need a compact, efficient way to drive high-brightness LEDs from a DC bus. The Mean Well LDD-350L step-down LED driver delivers a constant 350 mA output from a wide 9–56 VDC input, making it ideal for distributed LED lighting systems, signage, and architectural fixtures where space is at a premium. Its through-hole PCB design allows direct integration into custom circuit boards, while PWM and 1–10 V analog dimming inputs provide flexible brightness control for dynamic lighting scenes.

Key specifications

• Product type: DC/DC constant current LED driver (buck topology)
• Input voltage range: 9–56 VDC
• Output current: 350 mA (±5%)
• Output voltage range: 2–52 VDC
• Maximum output power: 18.2 W
• Efficiency: up to 95%
• Dimming: PWM and 1–10 VDC analog
• Number of outputs: 1
• Mounting: through-hole (PCB mount)
• Isolation: non-isolated
• Protection: short circuit, over temperature
• Operating temperature: -40°C to +85°C (free air convection)
• Compliance: UL, cUL, TUV, CE

Why choose it

The LDD-350L stands out for its high efficiency and wide input voltage tolerance, which simplifies power distribution in multi-channel LED systems. Its compact size (just 22.6 × 9.9 × 8.9 mm) and through-hole pins make it easy to integrate into dense PCB layouts. The dual dimming interface supports both digital PWM signals and analog 0–10 V controls, offering compatibility with a broad range of lighting controllers and dimmers. Built-in protection against short circuits and overheating ensures reliable operation even in demanding environments.

Ideal use cases

• Architectural and accent lighting with constant-current LED modules
• LED signage and channel letter illumination
• Custom PCB-based lighting fixtures in commercial or residential settings
• Portable or battery-powered LED systems operating from DC sources
• Retrofit projects where a small, efficient driver is required

Good to know

The LDD-350L is a non-isolated driver, meaning the output shares a common ground with the input. This is typical for many DC/DC LED drivers and is safe when the input DC bus is properly isolated from mains. It is designed for indoor or enclosed outdoor use (IP20 rating) and should be protected from moisture and direct weather. For best performance, keep the driver within its specified temperature range and ensure adequate airflow around the PCB. The driver is RoHS compliant and backed by Mean Well's reputation for quality and reliability.