Linear LED driver-controller has low dropout for automotive use

An automotive-compliant linear LED driver-controller, the AL5814Q by Diodes, has low dropout voltage and open LED detection for automotive linear-driven LED lamps.

The AL5814Q is designed for automotive applications requiring specific change control and is AEC-Q100 qualified. It has a grade 1 temperature rating, is PPAP capable, and is manufactured in IATF16949:2016-certified facilities.

It operates from an input voltage from 4.5 to 60V. It has up to 15mA drive and uses an external drive transistor, MOSFET or bipolar junction transistor (BJT), minimising its power dissipation, advises Diodes. The ability to drive higher current LEDs or multiple LED strings makes it suitable for applications that require higher light output including number plate illumination, rear lamps, internal lamps, and instrument panels.

The AL5814Q’s Vset pin can be used to adjust output current feedback level for a lower drop out via resistor divider, analogue dimming and thermal fold-back, the latter being implemented using an NTC resistor.

PWM dimming is supported by applying a PWM signal to the Vfault pin. There is over-temperature protection and input under-voltage lockout. There is also open-LED detection, via the Vfault pin, supported via the Sfault pin.

The AL5814Q’s tight 0.4V reference voltage (± five per cent across temperature) provides thermal stability and matching between lamps, notes the company.

The AL5814Q is available in the exposed MSOP-8EP package.

Diodes is a manufacturer and supplier of 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 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 solutions for high-speed signals.

The company’s headquarters and Americas’ sales office are located in Plano, Texas and Milpitas, California, USA.

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