AL1678-10B

OBSOLETE – PART DISCONTINUED PART OBSOLETE – NO ALTERNATE PART AL1678-20B/10B/08B UNIVERSAL, 500V BUCK LED DRIVER Description The AL1678-20B/10B/08B is a universal AC input (85 to 277 VAC), high efficiency and high accuracy Buck LED driver. The AL167820B/10B/08B topology provides accurate constant current over line and load regulation with tight tolerance ±3%, operating at boundary conduction mode (BCM) to ease in EMI/EMC qualification and testing to meet the latest regulatory laws. The AL1678-20B/10B/08B single buck stage system works with a single winding inductor and high voltage MOSFET included, therefore, can use fewer external components and create a low bill of material (BOM) cost solution. The AL1678-20B/10B/08B has rich protection features to enhance the system safety and reliability. It has thermal fold back function, which can reduce the output current when the driver’s temperature is higher than the setting value. The AL1678-20B/10B/08B is available in SO-7 package. Pin Assignments (Top View) OUT 1 VCC 2 ROVP 3 GND 4 SO-7 7 Drain 6 LC 5 CS Features > 90% Efficiency Valley Switching to Achieve Low Switching Loss Universal 85 to 277 VAC Input Range Internal MOSFET up to 500V Tight Current Sense Tolerance: ±3% Low Start-Up Current: 170µA Low Operation Current: 100µA (Static) Single Winding Inductor Internal Protections  Under Voltage Lock Out (UVLO)  Leading-Edge Blanking (LEB)  Output Open/Short Protection  Open-Load and Reload Detectio...