Diodes Inc. - High-efficiency LED drivers for non-dimmable retrofit LED bulb applications (AL1678 family)

Diodes Incorporated's latest product is the AL1678 series of LED drivers, suitable for driving non-dimmable refurbished LED bulbs in general lighting applications that do not require a high power factor (& gt; 0.7). To ensure lower total circuit bill of materials (BOM) costs while maintaining high performance, this 500V buck converter LED driver supports output power up to 15W, suitable for a wide range of LEDs in A / B / P and GU10 categories Lighting applies to indicators on all power line voltages. The AL1678 series is available in SO-7 packages and offers a variety of different rated current 500V MOSFETs, allowing designers to choose the most suitable driver to meet different bulb power and cost requirements. With an improved driver topology, the AL1678 series provides significant circuit flexibility and provides accurate constant current line and load regulation over a universal input range of 85VAC to 277VAC. In addition, by operating in boundary conduction mode, the driver can maintain EMI above 90% and maintain high efficiency, helping to meet EMC standards. The total cost of the BOM lamp of the AL1678 LED driver is very low, because it does not require external high-voltage MOSFETs and auxiliary windings, and only requires an external inductor. Integrated protection features include under-voltage lockout, over-temperature protection, LED open and short circuit protection, and thermal foldback to help improve system reliability of LED lights converted at high temperatures. AL1678's SO-7 package also helps improve electrical isolation and provides higher moisture resistance.