Analog and TRIAC Dimmable LED Controller

The MP4031 is a TRIAC and analog dimmable, primary-side–controlled, offline LED lighting controller with active PFC. It can output an accurate LED current for an isolated lighting application with a single-stage converter. The proprietary real-current–control method can accurately control the LED current using primary-side information. It can significantly simplify LED lighting system design by eliminating secondary-side feedback components and the optocoupler. The MP4031 implements power-factor correction and works in boundary-conduction mode to reduce MOSFET switching losses. The MP4031 has an integrated charging circuit at the supply pin for fast start-up without a perceptible delay. The proprietary dimming control expands the TRIAC-based dimming range. The special current sense structure can implement analog dimming. The MP4031 has multiple protections that greatly enhance system reliability and safety, including over-voltage protection, overload protection, supply-pin under-voltage lockout, and over-temperature protection. All fault protections feature auto-restart. The MP4031 is available in an 8-pin SOIC package.