Optoelectronics

Linear LED controllers deliver efficiency and accuracy

29th March 2018
Lanna Cooper

Diodes Incorporated has announced the AL5814, AL5817, AL5815 and AL5816 linear LED controllers, delivering dimmable and adjustable drive current for LED strings with more than 80% efficiency. The AL58xx series provides a low BOM-cost solution 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.

With an input range of 4.5-60V, these devices 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.

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 percent reference voltage accuracy and temperature stability. In addition, the AL5815 and AL5816 devices support PWM diming, while the AL5814 and AL5817 devices support both analogue and 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.

As linear controllers, the AL58xx series exhibits EMI performance, while the wide operating temperature range of -40°C to +105°C enables the parts to also be used in harsh environments.

The AL58xx series is available in SOT-25 and thermally-enhanced MSOP-8EP packages. The AL5815 and AL5816 are priced at $0.15 each in 10K quantities, while the AL5814 and AL5817 are priced at $0.20 in 10K quantities.

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