AF1821 Datasheet | Alfa-MOS

Alfa-MOS Technology TRIAC Dimming, Primary Side Control Offline LED Controller with Active PFC General Description The AF1821 is a TRIAC dimmable, primary-side-control offline LED lighting controller which can achieve high power factor and flicker-free TRIAC dimming output LED current for an isolate lighting application in a single stage converter. The proprietary real current control method can control the LED current accurately from the primary side information. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback ponents and the photo coupler. AF1821 can realize flicker-free TRIAC dimming. And it integrates power factor correction function and works in boundary conduction mode for reducing the MOSFET switching losses. The extremely low start up current and the quiescent current can reduce the power consumption thus lead to an excellent efficiency performance. The multi-protection function of AF1821 can greatly enhance the system reliability and safety. The AF1821 Features over-voltage protection, short-circuit protection, cycle-by-cycle current limit, VCC UVLO and auto-restart over temperature protection. The AF1821 is available in a small SOP-8 package. Features Real Current Control Without Secondaryfeedback Circuit Flicker-free Phase-controlled TRIAC Dimming Accurate Constant Current Output Boundary Conduction Mode Operation Ultra-low (10µA) Start Up Current Low (1m A) Quiescent Current Input UVLO Cycle-by-cycle Current Limit Over-voltage Protection Short-circuit Protection Over-temperature Protection Available in a 8 Pin SOP-8 Package Application Solid State Lighting Industrial and mercial Lighting Residential Lighting Pin Define (SOP-8) Marking Information ©Alfa-MOS Technology Corp. Rev.A Mar. 2013 .alfa-mos. Page 1 Alfa-MOS Technology TYPICAL APPLICATION TRIAC Dimming, Primary Side Control Offline LED Controller with Active PFC Block Diagram Fig 1. Application...