Triac-dimmable LED driver for 230/120VAC lamps

The new AL1697 LED driver by Diodes Incorporated targets line-powered, triac-dimmable LED lighting applications. The device provides compatibility with leading- and trailing-edge triac dimmers using a single-stage, high power-factor dimming circuit that complies with the NEMA SSL-6 dimming curve, delivering optimal line and load regulation. The integrated MOSFET eliminates the need for an auxiliary winding, which lowers BOM cost and enables a smaller PCB, making this an attractive and competitive solution for driving LED lamps up to 15W. The AL1697 is a high-precision, high-efficiency, buck-boost LED driver whose topology provides an accurate output current that enables exceptional line and load regulation. This design supports non-isolated (buck-boost) operation to address the isolation requirements for different lamps. Operating in boundary-conduction mode achieves higher conversion efficiency while also reducing switching noise and eases EMI design. The device features a low, 130µA startup current and a low operating current of 170µA. The MOSFET options provide a drain-source, on-resistance specification of 4O for operation up to 2A at 600V, or a super-junction RDS(ON) of 1.8O that can support 4A at 650V. The AL1697 offers standard internal protection features, such as output short-circuit, over-temperature, under-voltage lockout, leading-edge blanking and cycle-by-cycle over-current protection. The device also features over-voltage / output-open and thermal foldback protection for enhanced safety and reliability, says the company.