60V fast-dimming LED controller targets automotive lighting

March 28, 2019 //By Christoph Hammerschmidt
The AL5816Q is a linear LED controller for automotive LED lighting. The device from Diodes Inc. is designed for use in a wide variety of applications such as as rear light clusters, interior illumination, instrument panels, and license plate lighting.

With an operating voltage range of 4.5V to 60V, the AL5816Q supplies an output drive current of 15mA to control LED lights through an external BJT, delivering a constant current of a few mA up to 1.5A, or higher LED current if a MOSFET is used.

The combination of a high-input voltage and high-output drive current, coupled with a high-voltage PWM dimming feature, means automotive manufacturers can realize a significantly lower BOM for a wide range of automotive applications using the AL5816Q. The 5-pin SOT25 package requires very few external components and does not need a separate switching inductor. It features a high-voltage PWM input for LED light dimming. 

The feedback pin operates at just 200mV, enabling the AL5816Q to control the LED drive current precisely while minimizing the drop-out voltage and reducing the LED system power dissipation, particularly when compared against traditional linear LED controllers. 

The high-output drive current allows the AL5816Q to drive a single LED, an LED chain or multiple LED channels, as required by automotive manufacturers. The PWM dimming input accepts a signal operating at up to 50kHz. The device also features a number of protection features including input undervoltage lock-out and overtemperature shutdown.

The AL5816Q is available now in the SOT25 package.

Further information is available at https://www.diodes.com


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