LED driver meets worldwide retrofit lamp requirements

High power-factor operation is achieved with a single-stage buck converter topology, which uses constant on-time control and a simple closed loop to ensure the AL1676 delivers an accurate constant LED output current with good line and load regulation. Operating in boundary conduction mode eases EMI/EMC design requirements while the ability to detect off‑time helps eliminates the need for an auxiliary winding, contributing to the device’s very low BOM count and cost.

The AL1676 includes multiple protection features such as under- and over-voltage, over-temperature and thermal fold-back that all help to increase system reliability within the high ambient temperatures encountered in an LED bulb. The high level of integration coupled with a small 5x6mm SO-7 package also enable a very compact solution size, reusing the same design footprint for different wattage bulbs by virtue of the MOSFET options.

In 10,000 unit quantities, pricing for the various MOSFET options of the AL1676 in the small outline SO-7 package ranges from $0.110 to $0.204 each.