MEAN WELL LDH-45B-700W 28W 700mA DC/DC LED Driver Constant Current Non-Isolated Module

LED lighting projects that run on low-voltage DC power often struggle to find a driver that can deliver stable current across a wide input range without adding bulk or heat. The MEAN WELL LDH-45B-700W solves this by providing a compact, efficient, and reliable constant-current source that steps down 9–36 VDC to precisely drive 700 mA LED strings up to 40 V.

Who is it for

This driver is ideal for system integrators, lighting designers, and OEMs working with battery-powered or DC-bus LED installations, such as solar lighting, vehicle lighting, marine lighting, or industrial indicator panels. It suits anyone who needs a non-isolated DC/DC converter with built-in dimming and robust protection in a small encapsulated package.

Main features

• Constant current output of 700 mA with ±5% accuracy for consistent LED brightness.
• Wide input voltage range 9–36 VDC, compatible with 12V and 24V DC systems.
• Output voltage range 2–40 VDC, supporting up to 28 W of LED load.
• High efficiency up to 95%, minimizing energy loss and heat generation.
• 2-in-1 dimming (PWM and analog) for flexible brightness control.
• Protections against short circuit and over temperature for safe operation.
• Non-isolated design in a fully encapsulated module for harsh environments.
• Operating temperature range -40 to +70 °C, suitable for extreme conditions.
• Free air convection cooling—no fan needed, silent operation.
• Compliant with CE and UL (component recognized), ensuring safety and quality.

Specifications

• Brand: MEAN WELL
• Model: LDH-45B-700W
• MPN: LDH-45B-700W
• EAN: 4021087008174
• Type: LED Driver (DC/DC Converter)
• Output Current: 700 mA
• Output Voltage Range: 2–40 VDC
• Rated Power: 28 W
• Input Voltage: 9–36 VDC
• Efficiency: Up to 95%
• Dimming: 2-in-1 (PWM & Analog)
• Protections: Short Circuit, Over Temperature
• Operating Temperature: -40 to +70 °C
• Cooling: Free Air Convection
• Isolation: Non-isolated
• MTBF: >1,000,000 hours (MIL-HDBK-217F, 25°C)
• Start-up Time: <500 ms (at 24 VDC input, full load)
• Compliance: CE, UL (Component Recognized)

Tips

When integrating the LDH-45B-700W, ensure the input voltage stays within 9–36 VDC and that the total forward voltage of your LED string falls between 2 V and 40 V. For dimming, apply a 0–10 V analog signal or a PWM signal (100 Hz–1 kHz) to the dimming control wire. Mount the driver with adequate clearance for convection cooling, and avoid covering the encapsulation to maintain proper thermal performance.