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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 architecture divided into two primary sections. The main circuit operates without requiring secondary current feedback. The ICL5101, housed in a compact 16-pin package, integrates both PFC and half-bridge resonant controllers. Utilizing an LCC topology, it ensures constant current operation at a fixed frequency. The PFC segment delivers impressive low THD (Total Harmonic Distortion) and high PF (Power Factor) performance. At full load, the THD remains below 5%. When operating under 50% load and 277Vac, the THD stays below 10%. The output voltage range of the LCC portion can maintain constant current across a span of 25% to 100%, achieving up to 93% full-load efficiency for the entire system.
The dimming function is achieved through the use of a compact SOT23 6-pin package CDM10V controller paired with an optocoupler, offering a dimming range from 1% to 100%. It supports three types of dimming signals—PWM, 0-10V, and resistance setting—replacing the need for a complex MCU with a simplified circuit design.
Compared to traditional architectures such as PFC+Flyback+MCU, this solution offers both simplicity and high efficiency, making it a cost-effective choice for smaller power applications like 30W designs.
Application Areas:
This solution finds utility in various lighting applications including streetlights, 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 No Secondary Feedback Constant Current Dimming Demonstration Board*
Performance Metrics:
Infineon Bill of Materials Used in the Project:
This solution represents a significant advancement in LED driver technology, combining efficiency, simplicity, and adaptability to meet the needs of modern lighting applications. Its robust performance and competitive pricing make it an ideal choice for a wide range of lighting solutions.