Enhancing dimmer capability

Posted By : Joe Bush
Enhancing dimmer capability

Well suited for line powered, triac-dimmable LED lighting applications, the new AL1697 LED driver by Diodes Incorporated 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.

This 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 a high level of 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 start-up current and a low operating current of 170μA.

The MOSFET options provide a drain source, on-resistance specification of 4Ω for operation up to 2A at 600V, or a super-junction RDS(ON) of 1.8Ω 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.

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