Products, Materials + Tools | Mar 13, 2014

Dimmable Buck LED Driver from Diodes Incorporated Simplifies LED Lighting Design

Diodes Incorporated has introduced a dimmable buck LED driver enabling a reduction in component count and PCB size in 12 V and 24 V LED lighting systems and MR16-type LED lamps. The AL8807B is a hysteretic driver with an integrated power switch and operates at a switching frequency of 1MHz. The output current is 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. Lamp reliability is ensured by the driver’s built-in over-temperature, LED open-circuit and short-circuit protection features.

By packaging the driver in a small footprint, low thermal-resistance MSOP-8EP package, a higher power density is achieved, maximizing the permissible LED current over a wider ambient temperature range. The AL8807B delivers an LED drive current up to 1.3 A and operates between -40ºC to +125ºC with an efficiency of 96%.

From voltage sources between 6 V and 36 V, 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.

The AL8807B dimmable buck LED driver from Diodes Incorporated are priced at $0.32USD each in 10k quantities. Further information is available at www.diodes.com

About Diodes Incorporated:
Diodes Incorporated (Nasdaq: DIOD), a Standard and Poor's SmallCap 600 and Russell 3000 Index company, is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic and analog semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets. Diodes' products include diodes, rectifiers, transistors, MOSFETs, protection devices, functional specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors; power management devices, including LED drivers, AC-DC converters and controllers, DC-DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. For further information, including SEC filings, visit Diodes’ website at http://www.diodes.com.

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