The MP4030 is a TRIAC-dimmable， primary-sidecontrol， 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 MP4030 implements power-factor correction and works in boundary-conduction mode to reduce MOSFET switching losses. The MP4030 has an integrated charging circuit at the supply pin for fast start-up without a perceptible delay. The proprietary dimming contraol expands the TRIAC-based dimming range. The MP4030 has multiple protections that greatly enhance system reliability and safety， and include over-voltage protection， short-circuit protection， programmable primary-side overcurrent protection， supply-pin under-voltage lockout， and over-temperature protection. All fault protections feature auto-restart. The MP4030 is available in an 8-pin SOIC package.