Power Integrations, Inc. AC DC Converters, Offline Switches LYT4318E

The LYT4318E is part of the LYTSwitch-4 family of high power LED driver ICs designed for low-line applications with TRIAC dimming capabilities. It operates within an input voltage range of 85-132 VAC and supports a minimum output power of 18 W and a maximum output power of 78 W. The device features a primary-side constant current control with a power factor correction (PFC) that exceeds 0.9, ensuring compliance with international standards for total harmonic distortion (THD) and harmonics. The LYT4318E is optimized for efficiency, achieving up to 92% in typical applications, and offers fast start-up times of less than 250 ms at full brightness and under 1 second at 10% brightness. It is designed to work effectively with a wide range of TRIAC dimmers, providing a dimming capability down to less than 5% output. The integrated design reduces component count and costs, eliminating the need for optoisolators and primary-side aluminum electrolytic bulk capacitors, which enhances the longevity of the driver, particularly in high-temperature environments. This product is suitable for engineers looking for a reliable and efficient solution for LED driver applications that require TRIAC dimming functionality.