AF1820 Datasheet | Alfa-MOS

Alfa-MOS Technology Dimmable, Without electrolyte capacitor Offline LED Controller with Active PFC General Description The AF1820 is a TRIAC and multi-steps dimmable simplest current injected topology control IC for isolation LED driver that had some characteristics, the first is operating without electrolytic capacitors which is necessary for the DC power supply structure, the second is operating without photo coupler and the last is enhancing the power factor to larger than 90%. Eliminating the electrolytic capacitor in the LED lighting driver could fulfill the long life time and high efficiency of the lamps. Eliminating the photo coupler in the light load LED lighting driver could save the power which is larger than 0.75W for 500m A LED current. (reference voltage 2.5v × 0.5A LED current Ј 1.25W); for a 10W LED application, this cold lose 12.5% efficiency at least. Moreover, with eliminating electrolytic capacitors and photo coupler could reduce the cost for the LED driver. Features Without electrolyte capacitor No photo coupler PWM frequency jittering to reduce EMI noise HV Start-up circuit eliminates outer resistor and reduce input power consumption Constant current (RMS) for LED Phase-controlled TRIAC Dimming Multi-steps dimming Integrated Over Current Protection (OCP) Embedded Leading Edge Blanking (LEB) Integrated Over Voltage Protection (OVP) Integrated Thermal Shutdown (TSD) System efficiency >90% in simulation System PF >0.9 in simulation Application LED lighting Driver OLED lighting Driver Pin Define (SOP-8 ) Marking Information ©Alfa-MOS Technology Corp. Rev.A Mar. 2013 .alfa-mos. Page 1 Alfa-MOS Technology Dimmable, Without electrolyte capacitor Offline LED Controller with Active PFC Typical Application Circuit Lo F1 X C1 M O V1 Ro DB 1 C1 L1 C2 C3 R5 D3 R6 C4 D1 Q1 R7 R8...