Power Integrations, Inc. LED Drivers LYT7503D

The LYT7503D is a high-performance LED driver IC designed for single-stage, high power factor, constant current applications in a buck topology. It operates within a wide input voltage range of 90 VAC to 308 VAC and can deliver a maximum output current of 125 mA at an output voltage of up to 60 V. The device features a robust 725 V MOSFET, ensuring increased line voltage surge resistance and low EMI. With a switching frequency of 20 kHz, the LYT7503D achieves high efficiency greater than 85% and a power factor exceeding 0.9. It incorporates critical conduction mode (CrM) operation, which minimizes turn-on losses and allows for the use of slower reverse-recovery output diodes, reducing overall system costs. The driver also supports TRIAC dimming applications without requiring an active bleeder, providing a dimming ratio better than 10:1. The LYT7503D includes comprehensive protection features such as input and output overvoltage protection, output short-circuit protection, and thermal foldback, ensuring reliable operation under various conditions. Its small SO-8 package and low component count make it suitable for compact designs. This product is ideal for engineers looking for a reliable and efficient solution for LED lighting applications.