Fast dimming linear LED controller meets automotive conditions

Targeting automotive LED lighting applications, the AL5816Q is an automotive-compliant, linear LED controller from Diodes.

It has an operating voltage range of 4.5 to 60V and supplies an output drive current of 15mA to control LED lights through an external bipolar junction transistor to deliver a constant current up to 1.5A. This can be higher LED current if a MOSFET is used. The ability to optimise the external transistor means the AL5816Q is suitable for automotive LED lighting applications, such as rear light clusters, interior illumination, instrument panels, and licence plate lighting.

The high input voltage and high output drive current, coupled with high voltage PWM dimming allows automotive manufacturers to lower bill of materials. The five-pin SOT25 package requires very few external components, explains Diodes, and does not need a separate switching inductor.

The feedback pin operates at 200mV, enabling the AL5816Q to control the LED drive current precisely while minimising the drop-out voltage and reducing the LED system power dissipation, compared with 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. The PWM dimming input accepts a signal operating at up to 50kHz.

Protection features include input under-voltage lock-out and over-temperature shutdown.

The AL5816Q is available in the SOT25 package.

Diodes manufactures and supplies application specific standard products within the broad discrete, logic, analogue and mixed-signal semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets with a range of diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC/DC converters and controllers, DC/DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. Diodes also has timing, connectivity, switching, and signal integrity devices for high-speed signals.

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