The MP4033 is a TRIAC-dimmable primary-side–control, offline LED lighting controller with active PFC. It is also available for applications that requires analog dimming with PWM input. It outputs an accurate LED current for an isolated lighting application with a single-stage converter. The proprietary real-current–control method accurately controls the LED current using primary-side information. The MP4033 implements power-factor correction and works in boundary-conduction mode to reduce MOSFET switching losses. The adaptive dimmer type detection and phase-cut-based dimming control achieves good dimmer compatibility and deep dimming range. The MP4033 has an integrated charging circuit at the supply pin for fast start-up without a perceptible delay. With the unique control of the driver pin DIM, the MP4033 supports color temperature and brightness control for warm sunset dimming application The MP4033 has multiple protections that greatly enhance system reliability and safety, including output over-voltage protection, output short-circuit protection, winding short circuit protection, programmable thermal fold-back (MSOP10/SOIC14), ZCD pin short circuit protection, supply-pin under-voltage lockout, and over-temperature protection. All fault protections feature auto-restart. The MP4033 is available in SOIC-8 / MSOP-10 / SOIC-14 package.