Dimmable buck LED driver simplifies lighting design

Posted By : Nat Bowers
Dimmable buck LED driver simplifies lighting design

Reducing component count and PCB size in 12 and 24V LED lighting systems and MR16-type LED lamps, the AL8807B is a dimmable buck LED driver from Diodes Incorporated. The hysteretic driver with an integrated power switch operates at a switching frequency of 1MHz and has an output current set using a single external sense resistor.

Dimming is achieved by applying a fast digital PWM signal to the driver’s control input. A low voltage, applied to the same input, turns the output power switch off. From voltage sources of 6-36V, the driver will produce a constant current for a chain of high brightness LEDs. Average LED current accuracy is better than 5%, helping to improve channel-to-channel matching and meeting the requirements of most medium voltage LED lighting products.

By packaging the driver in a small footprint, low thermal-resistance MSOP-8EP package, a higher power density is achieved, maximising the permissible LED current over a wider ambient temperature range. The AL8807B delivers an LED drive current up to 1.3A and operates over a temperature range from -40 to +125ºC with an efficiency of 96%. Lamp reliability is ensured by the driver’s built-in over-temperature, LED open-circuit and short-circuit protection features.

The AL8807B dimmable buck LED driver from Diodes Incorporated is available now, priced at $0.32 (USD) each in 10,000 unit quantities.


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