Needing only two additional components, the AL5801 linear LED driver from Diodes Incorporated enables designers to simplify automotive interior, signage and general lighting control circuits.
Comprising a 100 V rated N-channel MOSFET and pre-biased NPN transistor, this small-footprint SOT26 packaged device will drive chains of up to 30 low-power, series-connected LEDs with currents from 20 mA to 350 mA.
The IC’s open-drain output will operate from between 1,1 V and 100 V, ensuring common 12 V, 24 V and 48 V power rails are catered for, while the LED current is set using an external low-value resistor. By generating a 0,56 V reference voltage across the resistor, the driver’s internal control transistor helps minimise power losses and ensure sufficient supply voltage margin.
By virtue of the reference voltage’s negative temperature coefficient, the output current is also automatically reduced at higher temperatures, helping to protect the LED chain from any damage, so improving overall circuit reliability.
In addition, the AL5801’s wide operating temperature range of -40°C to +150°C means it can be mounted immediately adjacent to LEDs where PCB space is tight.
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