Linear LED controllers do not require inductors for signage and smart-lighting

Diodes offers the AL5814, AL5817, AL5815 and AL5816 linear LED controllers, claimed to deliver dimmable and adjustable drive current for LED strings with more than 80 per cent efficiency. The AL58xx series provides a low bill of materials cost for a range of applications in the commercial and industrial areas including signage, instrumentation illumination, lighting of appliance interiors, architectural details and general smart-lighting installations.

Input range is 4.5 to 60V. The AL5814, AL5817, AL5815 and AL5816 linear LED controllers do not require inductors and maintain good EMI performance, making system integration simpler. Internal power dissipation is also minimised compared with other designs due to an external power transistor, says Diodes. The AL58xx series is capable of providing up to 15mA to an external MOSFET or bipolar transistor to drive LED strings. The LED drive current is configured by an external resistor with four per cent reference voltage accuracy and excellent temperature stability. In addition, the AL5815 and AL5816 devices support PWM diming, while the AL5814 and AL5817 devices support both analogue and pulse width modulation (PWM) dimming.

Protection features include over-temperature and input under-voltage lock-out. The AL5814 and AL5817 devices also provide ‘LED open’ protection via a Vfault pin, as well as LED thermal fold-back protection.

The linear controllers exhibits good EMI performance and the wide temperature range of -40 to +105 degree C enables the parts to also operate in harsh environments.

The AL58xx series is available in SOT-25 and thermally-enhanced MSOP-8EP packages. 

Diodes manufactures and supplies application specific standard products within the broad discrete, logic, analogue and mixed-signal semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets.

The company’s portfolio includes diodes, rectifiers, transistors, MOSFETs, protection devices, function-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. Diodes also has timing, connectivity, switching, and signal integrity solutions for high-speed signals.

Corporate headquarters and Americas’ sales office are located in Plano, Texas and Milpitas, California, USA. Design, marketing, and engineering centres are located in Plano, Milpitas, Taipei, Taoyuan City, and Zhubei City, Taiwan; Manchester, England; and Neuhaus, Germany.

Diodes’ wafer fabrication facility is located in Manchester, with an additional facility located in Shanghai, China. Diodes has assembly and test facilities located in Shanghai, Jinan, Chengdu, and Yangzhou, China, as well as in Hong Kong, Neuhaus and Taipei.

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