Low-cost dimmable LED driver delivers wide triac compatibility
An integrated MOSFET, which also eliminates the need for an auxiliary winding, reduces BOM cost and component count while the option of three MOSFET voltage/current ratings provides design flexibility for meeting manufacturing requirements for residential lighting.
The AL1696 is based on buck or buck-boost topology and implements constant current conversion with a high power factor by operating in boundary conduction mode which also reduces switching noise, easing EMI/EMC testing and qualification. The design only requires a single winding inductor and achieves a tight current sense tolerance of ±3%. The device features a low operating current of 120 μA, with a 150 μA startup current, and is compatible with a wide of leading-edge and trailing-edge dimmers, providing compliance with the NEMA SSL6 dimming curve.
MOSFET options for 3 A at 300 V, 2 A at 500 V and 2 A at 600 V enable the AL1696 to be matched to end-market line-input voltage requirements and allow it to be used in LED lamps up to 12 W. The AL1696 is offered in a small outline SO-7 package that is configured with an extra pin space between the high-voltage MOSFET drain and its low-voltage pins to increase electrical isolation. The device also features internal protection for output short circuit, over-temperature, under-voltage lockout, leading-edge blanking and cycle-by-cycle over-current protection.
In 10k quantities, unit pricing for the three MOSFET options of the AL1696 is as follows: AL1696-30AS7-13 (3A/300V) $0.18; AL1696-20BS7-13 (2A/500V) $0.21, AL1696-20CS7-13 (2A/600V) $0.24.
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