LED driver reduces dimmable MR16 LED lamp footprint
The AL8812 co-packages a 60 V, 3.6 A-rated power N-channel MOSFET with all primary functions required by a DC-DC controller.
With a 6 mm x 4 mm footprint and an off-board profile of 0.6 mm, the AL8812 converter is comprised of a temperature-compensated reference, comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch.
The AL8812 has an input voltage range of 3 V to 20 V and an output voltage that is fully adjustable up to 60 V. The wide operating voltage range makes the device suitable for medium-voltage LEDs and 12 VAC lighting applications, as well as dimmable MR16 LED lamps.
Shut-down current is low at less than 0.01 µA, typical, and its maximum output switch current is 3.6 A. The converter is able to deliver very accurate voltage and current control by incorporating a precision reference with a 2% tolerance.
By combining the AL8812 with its AL8807A constant current step-down converter, Diodes Incorporated has produced a two-stage reference design for dimmable MR16 LED lamps that provides good transformer compatibility and low current ripple at a reasonable BOM cost.
The AL8812 universal DC-DC converter is available from Diodes Incorporated for $0.3 each in 3k quantities.
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