1. Introduction and Key Features
The Mean Well LDH-45 series DC-DC Constant Current LED Drivers are designed with a step-up mode, allowing them to boost input voltage to power multiple LEDs efficiently. This low-voltage driver is suitable for various lighting applications, including street lighting, landscape, architectural, and household lighting.
Key Features:
- DC-DC step-up converter for increased voltage output.
- Constant current output: 350mA to 1050mA.
- Wide output LED string voltage up to 126Vdc.
- High efficiency, up to 95%.
- Built-in EMI filter compliant with EN55015 without additional input filter and capacitors.
- PWM + analog dimming and remote ON/OFF control.
- Protections: Short circuit, over voltage, under voltage.
- Cooling by free air convection.
- Fully encapsulated design.
- 3-year warranty.
Figure 1: Overview of Mean Well LDH-45 series features and general specifications.
2. Safety Information
Please read these instructions carefully before installation and use. Failure to follow these instructions may result in electric shock, fire, or other hazards.
- Ensure the input voltage is within the specified range (9-18Vdc) to prevent damage to the driver and connected LEDs.
- Do not exceed the maximum output current or voltage ratings.
- Installation should be performed by a qualified electrician in accordance with all local and national electrical codes.
- Disconnect power before making any connections or performing maintenance.
- Do not operate the driver in environments exceeding its specified operating temperature or humidity.
- Ensure proper ventilation; the driver is cooled by free air convection.
3. Mechanical Details and Pin Configuration
The LDH-45 series driver features a compact design for easy integration. Understanding the pin configuration is crucial for correct wiring.
Pin Configuration:
| Pin No. | Output | Description |
|---|---|---|
| 1 | Vin+ (red) | DC Supply Positive |
| 2 | Vin- (black) | DC Supply Negative |
| 3 | DIM- (black) | GND of DIM signal (Do not connect to Vout- or Vin-) |
| 4 | Analog DIM (white) | ON/OFF and analog voltage dimming (leave open if not used) |
| 5 | PWM DIM (blue) | ON/OFF and PWM dimming (leave open if not used) |
| 6 | Vout- (black) | LED - connection |
| 7 | Vout+ (red) | LED + connection |
Figure 2: Mechanical dimensions, pin configuration, and wiring style for the LDH-45 series.
4. Installation and Wiring
Follow these steps for proper installation and wiring of your LDH-45A-1050W LED driver.
- Input Power Connection: Connect the DC power supply positive to Pin 1 (Vin+, red wire) and negative to Pin 2 (Vin-, black wire). Ensure the input voltage is between 9 and 18Vdc.
- LED Output Connection: Connect the LED string positive to Pin 7 (Vout+, red wire) and the LED string negative to Pin 6 (Vout-, black wire). Observe correct polarity.
- Dimming Control (Optional):
- PWM Dimming: Connect the PWM signal to Pin 5 (PWM DIM, blue wire). The dimming range is 0.8V to 8Vdc. If not used, leave this pin open.
- Analog Dimming: Connect the analog control voltage (0.25-1.3Vdc) to Pin 4 (Analog DIM, white wire). If not used, leave this pin open.
- DIM Signal Ground: Connect the ground of the dimming signal to Pin 3 (DIM-, black wire). This pin should not be connected to Vout- or Vin-.
- Remote ON/OFF Control: Both PWM DIM and Analog DIM pins can be used for remote ON/OFF control. A voltage between 0.8V and 8Vdc (for PWM) or 0.25V and 1.3Vdc (for Analog) will turn the driver ON. A voltage below 0.5Vdc (for PWM) or 0.2Vdc (for Analog) will turn the driver OFF.
- Secure Connections: Ensure all wire connections are secure and properly insulated to prevent short circuits.
5. Operating Modes and Dimming
The LDH-45A-1050W driver supports operation without dimming, PWM dimming, and analog dimming.
Operation Without Dimming:
To operate the driver at its rated current without dimming, ensure the Analog DIM and PWM DIM pins (Pin 4 and Pin 5) are left open (unconnected).
PWM Dimming Control:
The output current (Io) is adjusted by the PWM signal duty cycle. A PWM signal with a frequency of 1K-10KHz is recommended. The output current is proportional to the PWM duty cycle.
Analog Dimming Control:
The output current (Io) is adjusted by a DC voltage applied to the Analog DIM pin. The dimming input voltage range is 0.25-1.3Vdc. The output current is proportional to the analog control voltage.
Figure 3: Diagrams for standard application, PWM dimming control, and analog dimming control.
6. Product Specifications
Detailed electrical and physical specifications for the LDH-45A-1050W model.
Electrical Specifications (LDH-45A-1050W):
- Input Voltage: 9 ~ 18Vdc
- Output Voltage: 12 ~ 43Vdc
- Rated Current: 1050mA (1.05A)
- Rated Power: 45W
- Efficiency: 95% (typical)
- Ripple & Noise: 1.2Vp-p
- Dimming: PWM & On/Off Control, Analog Dimming
- Protection: Short Circuit, Over Voltage, Under Voltage
General Specifications:
- Product Dimensions: 3.15 x 2.36 x 1.18 inches (80 x 60 x 30 mm)
- Item Weight: 0.01 ounces (approx. 0.28 grams)
- Operating Temperature: -40 ~ +70°C (Refer to "Derating Curve")
- Working Humidity: 20 ~ 90% RH non-condensing
- Storage Temperature: -40 ~ +85°C
- Vibration: 10 ~ 500Hz, 2G 10min./1cycle, period for 60min. each along X, Y, Z axes
- EMC Emission: Compliance to EN55015
- EMC Immunity: Compliance to EN61000-4-2,3,4,6,8; light industry level, criteria A
7. Performance Characteristics
The following graphs illustrate the performance characteristics of the LDH-45 series under various conditions.
Derating Curve and Static Characteristics:
The derating curve indicates the maximum load the driver can handle at different ambient temperatures. The static characteristics graph shows the relationship between load and input voltage.
Efficiency vs. Output Voltage:
These graphs demonstrate the driver's efficiency across different output voltages and number of LEDs, providing insight into optimal operating conditions.
Figure 4: Efficiency versus output voltage for different LDH-45 models and LED counts.
Figure 5: Additional efficiency versus output voltage graphs for LDH-45 series.
8. Troubleshooting
If you encounter issues with your LDH-45A-1050W LED driver, consider the following common troubleshooting steps:
- No Light Output: Check input power supply connections and voltage. Verify LED string polarity and ensure the LED string is not open or shorted. Confirm dimming pins are correctly configured or left open if not used.
- Flickering LEDs: Ensure stable input voltage. Check for loose connections. If using dimming, verify the dimming signal is stable and within specifications.
- Incorrect Brightness: If dimming is active, check the dimming signal level (PWM duty cycle or analog voltage). Ensure the driver is not operating in an environment that causes thermal derating.
- Overheating: Ensure adequate ventilation around the driver. Verify the load does not exceed the driver's rated power. Check ambient temperature.
If problems persist after checking these points, contact customer support.
9. Maintenance
The LDH-45A-1050W LED driver is designed for reliable operation with minimal maintenance.
- Cleaning: Periodically inspect the driver for dust accumulation. If necessary, gently clean the exterior with a dry, soft cloth. Do not use liquid cleaners.
- Inspection: Regularly check all wiring connections for tightness and signs of wear or damage.
- Environment: Ensure the operating environment remains within the specified temperature and humidity ranges.
10. Warranty and Support
The Mean Well LDH-45A-1050W LED Driver comes with a 3-year warranty from the date of purchase, covering defects in materials and workmanship under normal use. For warranty claims or technical support, please contact your retailer or EverSale customer service with your purchase details.
For further assistance, please refer to the official Mean Well documentation or visit the EverSale support website.