Low-voltage LED driver

13 October 2010 Opto-Electronics

Diodes Incorporated has developed an LED driver tailored to fit low-voltage illumination products operating at between 6 V and 30 V. The AL8805, a 1 A buck mode constant current switching converter, will support up to ten 3 W LEDs connected in series, suiting a range of low-cost ‘safe electrical’ designs including the ubiquitous MR16 lamp.

The driver’s typical constant current output accuracy of 5%, irrespective of source voltage and LED chain length, ensures uniform LED brightness and good inter-lamp matching without the need for ballast resistors. With nominal output current determined by external resistor setting, LED dimming is simply achieved by either a DC voltage or PWM signal on the device’s control input. A DC voltage between 0,5 V and 2,5 V yields an output current between 25% and 100% of nominal, while a PWM signal between normal CMOS or TTL levels offers a 1000:1 dynamic dimming range. On/off control is provided via a <0,4 V signal applied to the same control input.

The LED driver’s enhanced switching speed and low on-resistance provide 1 MHz switching frequency capability which reduces the size of the external components required in thermally demanding environments. The AL8805 is provided in the SOT25 package.

For more information contact Michael Nel, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

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