LED Driver Capacitor Solution

For LED driver input filtering, we recommend Aishi snap-in capacitors with 400-450V ratings for high-power applications (100W+) and radial lead capacitors for lower power designs. The input capacitor must handle high surge currents at power-on, so select capacitors with adequate ripple current ratings. For universal input designs (90-277V AC), use 400-450V rated capacitors. For PFC circuits, select capacitors rated for the PFC output voltage (typically 380-400V DC).

Use snap-in capacitors for LED drivers above 100W. Select voltage rating at least 1.2x maximum input voltage. Ensure adequate ripple current capability.

Output capacitor selection for LED drivers depends on the LED current ripple requirements and switching frequency. Calculate required capacitance using C = I_LED / (f_sw × ΔV_ripple), where I_LED is LED current, f_sw is switching frequency, and ΔV_ripple is allowable ripple voltage. For most LED applications, target less than 5% current ripple. Use low-ESR capacitors for high-frequency switching designs. Consider parallel capacitors for high-current applications to share ripple current.

Calculate capacitance based on LED current ripple requirements. Use low-ESR capacitors for high-frequency designs. Consider parallel configuration for high currents.

Capacitor lifetime in LED drivers depends on operating temperature, voltage stress, and ripple current. With proper design (80% voltage derating, 70% temperature derating), Aishi capacitors can achieve 50,000+ hours in LED applications. For example, a 105°C rated capacitor operated at 75°C and 80% voltage can achieve 80,000+ hours. This exceeds typical LED lifetimes of 50,000 hours, ensuring maintenance-free operation. Always perform lifetime calculations for your specific operating conditions.

Design for 80% voltage and 70% temperature derating. Calculate lifetime using Arrhenius equation. Target 50,000+ hours for LED applications.

Outdoor LED lighting requires capacitors with extended temperature ratings and high reliability. We recommend 105°C rated capacitors for outdoor applications to handle temperature extremes. The SL series offers 15,000-20,000 hour lifetime ratings ideal for street lights and outdoor fixtures. Ensure the capacitor case is protected from direct moisture exposure through proper enclosure design. For very harsh environments, consider conformal coating or potting for additional protection.

Use 105°C rated capacitors for outdoor applications. Select SL series for extended lifetime. Ensure proper enclosure protection from moisture.

Input capacitors filter AC line voltage and handle surge currents - typically 100-470uF at 400-450V. PFC output capacitors store energy and filter PFC output ripple - typically 1000-10000uF at 400-450V depending on power level. Output capacitors filter DC output for the LEDs - typically 470-2200uF at voltage matching LED string voltage. Each has different stress profiles: input sees line frequency ripple, PFC sees high-frequency switching ripple, and output sees LED current ripple. Select capacitors rated for the specific stress conditions in each location.

Input: high voltage, moderate capacitance. PFC: high voltage, high capacitance. Output: LED voltage, low ESR for current ripple.