Diodes Incorporated’s New LED Driver AL8805
Sep 15, 2010 Diodes Incorporated announced a LED driver tailored to fit low voltage illumination products operating at between 6V and 30V - AL8805. The AL8805, a 1A rated buck mode constant current switching converter, will support up to ten 3W LEDs connected in series, suiting a range of low cost ‘safe electrical’ designs including the ubiquitous MR16 lamp.
With nominal output current determined by external resistor setting, LED dimming is simply achieved by either a DC voltage or PWM signal on the AL8805’s control input. A DC voltage between 0.5V and 2.5V yields an output current between 25% and 100% of nominal, while a PWM signal between normal CMOS or TTL levels offers a flexible 1000:1 dynamic dimming range. On/off control is provided via a <0.4V signal applied to the same control input. The LED driver’s enhanced switching speed and low on-resistance provide 1MHz switching frequency capability which reduces the size of the external components required in thermally demanding environments. The AL8805 is provided in the SOT23-5 package.
Author: BIO T&T
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