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Infineon 80W LCC no secondary feedback constant current dimming LED driver solution
Project Introduction:
This constant current design features a straightforward circuit layout divided into two primary sections. The main circuit operates without the need for secondary current feedback, simplifying its structure significantly. The ICL5101, housed in a compact 16-pin package, integrates both PFC (Power Factor Correction) and half-bridge resonant controllers. By utilizing an LCC (Ladder Capacitor Compensation) topology, it ensures consistent current output at a fixed frequency. The PFC component demonstrates exceptional performance with low Total Harmonic Distortion (THD) and high Power Factor (PF). At full load (100%), the THD remains below 5%. Even under 50% load at 277Vac, the THD stays under 10%. The output voltage range of the LCC portion can maintain constant current across a span of 25% to 100%, achieving up to 93% overall machine efficiency.
The dimming functionality is achieved through a compact SOT23 6-pin CDM10V controller paired with an optocoupler, offering a dimming range from 1% to 100%. It supports three different types of dimming signals: PWM, 0-10V, and resistance settings, effectively replacing the need for an MCU with a simpler circuit design. Compared to traditional architectures like PFC + Flyback + MCU, this solution boasts simplicity and high efficiency, making it more cost-effective for lower-power applications, such as 30W designs.
Application Areas:
This solution finds utility in various lighting applications including street lights, panel lights, downlights, projection lights, and displays.
Circuit Diagram:
*Figure-1: Non-Secondary Feedback Constant Current Dimming Schematic Using LCC*
Physical Picture:
*Figure-2: 80W Non-Secondary Feedback Constant Current Dimming Demonstration Board*
Performance:
Bill of Materials:
In summary, this LED driver solution offers a balance of efficiency, simplicity, and cost-effectiveness, making it an ideal choice for modern lighting applications where space and performance are critical considerations. Its ability to handle multiple dimming methods adds versatility, while maintaining high standards of reliability and energy efficiency.