Linear LED controllers drive LED strings with over 80% efficiency

March 28, 2018 // By Julien Happich
Diodes Incorporated's AL5814, AL5817, AL5815 and AL5816 linear LED controllers have been designed to deliver 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.

With an input range of 4.5 to 60V, these devices do not require inductors and maintain good EMI performance, making system integration simpler. Internal power dissipation is also minimized 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 4% 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 analog 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. The chips operate in the -40 to +105°C temperature range.
Diodes Incorporated -


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