LED Power Supplies
Definition: LED power supplies convert input voltage (AC or DC) to a regulated output suitable for driving LEDs.
Types
- Constant Voltage (CV): 12V or 24V DC – used with current-limiting resistors or LED strips.
- Constant Current (CC): Outputs fixed current (e.g., 350mA, 700mA) – ideal for individual high-power LEDs.
- Dimmable Supplies: Support PWM, 0-10V, DALI, or TRIAC dimming protocols.
Key Parameters
- Voltage & Current: Match LED specifications exactly.
- Power Rating: Supply wattage should exceed total LED load by 20%.
- Efficiency: Look for >85% efficiency (e.g., 80 PLUS certified).
- IP Rating: IP67 for outdoor/wet environments.
- Lifetime: Typically 50,000 hrs; check MTBF ratings.
Selection Tips
- Determine if your LEDs need CV or CC.
- Calculate total power: V × I × number of LEDs.
- Ensure proper thermal management and ventilation.
- Use drivers with over-voltage, over-current, and short-circuit protection.
- For dimming, verify compatibility between driver and control system.
Note: Always refer to LED manufacturer datasheets when selecting a power supply.