Compact linear LED driver supports low-current lighting systems

September 12, 2012 // By Paul Buckley
Diodes Incorporated has introduced a 60 V linear LED driver which delivers a constant current of up to 150 mA and provides designers of low-current illumination and signage applications with a simplified circuit solution for accurately controlling 1/2 W LEDs.

Housed in a small-footprint, thermally enhanced SM package option, the AL5812 is able to meet power handling requirements over a wide supply voltage and ambient temperature range.

LED current is set using a high value resistor on the driver's low voltage, 0.5V RSET pin, enabling the specification of a lower cost, smaller footprint resistor to reduce total system BOM cost. A standard low-value decoupling capacitor is the only other external component needed. The driver maintains an LED current accuracy to a tolerance of 3%.

Offered in the exposed pad MSOP-8EP and U-DFN3030-6 packages, the AL5812 drives up to 16 low-power LEDs, with its open-drain output handling a swing from 1V to 60V. The driver's industrial temperature range of -40 to +125C means it readily accommodates high luminaire operating temperatures.

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