MEAN WELL LDH & LDB Series DC-DC LED Drivers
The LDH and LDB series are high-efficiency, DC-DC constant current LED driver modules designed for integration into lighting systems powered by DC sources (e.g., batteries or DC buses). They are compact, reliable, and essential for modern smart lighting designs.
- LDH Series (Step-Up/Boost): A DC-DC boost converter that takes a lower input DC voltage and steps it up to drive a longer string of LEDs (higher voltage).
- LDB Series (Step-Down/Buck): A DC-DC buck converter that takes a higher input DC voltage and steps it down to drive LED strings that require lower voltage.
- Compact Form Factor: Both series utilize highly efficient circuit topologies, making them small enough to be integrated directly into PCB assemblies or custom luminaire housings.
Technical Highlights
- High Efficiency: Both series offer exceptional energy conversion (up to 95% for LDH, 91% for LDB), minimizing thermal buildup within small fixture enclosures.
- Wide Input/Output: Designed for wide voltage swings, allowing them to maintain constant current output even when the DC input source fluctuates.
- Protection Mechanisms: Fully protected against short circuits and over-temperature, with auto-recovery functionality.
- Reliability: Engineered to withstand the thermal challenges of being mounted inside enclosed lighting fixtures, backed by a 3-year manufacturer warranty.
Comparison: LDH vs. LDB Design
Understanding the difference between Boost and Buck topology is critical for selecting the right DC-DC driver for your LED string configuration.
| Feature | LDH Series (Boost) | LDB Series (Buck) |
|---|---|---|
| Conversion Type | Step-Up (Boost) | Step-Down (Buck) |
| Typical Use Case | Driving LEDs from a low-voltage battery (e.g., 12V) to a high-voltage LED array. | Driving LEDs from a high-voltage bus (e.g., 24V) to a lower-voltage LED array. |
| Efficiency | Up to 95% | Up to 91% |
| Physical Format | Available in PCB pin or wire types | Compact module for PCB mounting |
System Design Rule: As a general rule, the output voltage should ideally be higher than the input voltage for the LDH (Boost) series, and lower than the input voltage for the LDB (Buck) series to achieve optimal performance.
Control & Dimming Options
Both series offer sophisticated dimming control to enable smart lighting features in battery-powered or DC-bus systems.
| Dimming Method | Capability Description |
|---|---|
| PWM Dimming | Allows precise brightness control via a Pulse Width Modulation signal. Ideal for microcontrollers or smart home gateways. |
| Analog Dimming | Supports 0-10V or resistive dimming, allowing simple manual brightness adjustment using a potentiometer. |
| Remote ON/OFF | Integrated remote control logic enables switching the LED output on or off without disconnecting the main power input. |
