Diodes’ AL5814, AL5817, AL5815, and AL5816 linear LED controllers deliver dimmable and adjustable drive current for LED strings with more than 80% efficiency. With an input range of 4.5V to 60V, the devices do not require inductors and maintain reliable EMI performance. Internal power dissipation is also minimized compared with other designs due to an external power transistor.
The components are capable of providing up to 15 mA 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 reliable temperature stability. In addition, the AL5815 and AL5816 devices support PWM dimming, 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. As linear controllers, the AL58xx series exhibits good EMI performance, while the wide operating temperature range of -40°C to +105°C enables the parts to also be used in harsh environments.