The AL5814Q is automotive-compliant, AEC-Q100 Grade 1 qualified. It features low dropout voltage and enhanced dimming.
The AL5614Q is an adjustable linear LED controller that works with an input voltage range of 4.5 volts to 60 volts. The device supplies a maximum of 15 mA of drive current and is used with an external LED driving power device, such as a MOSFET or BJT.
The employment of an external driving power component minimizes the unit’s internal power dissipation when compared to traditional linear LED drivers. This arrangement also enables the AL5614Q to drive higher current LEDs or multiple LED strings. Because of this, the device is suitable for applications that require higher light output including:
As a low dropout voltage device, the unit can operate effectively even when the power supply voltage is very close to the voltage of the output.
The unit’s output current can be set via the voltage at the VSET pin. This voltage is set through the use of a resistor divider, R5 and R6, operating between the REF pin and the VSET pin.
The voltage across the external sense resistor, R1, is fed to the FB pin for sensing. When the voltage exceeds VSET voltage that has been set by the voltage divider, the output at the OUT pin goes lower, decreasing the drive to the external transistor.
The VFAULT pin is responsible for pulse width modulation for dimming and open-LED detection (which can be supported via the SFAULT pin).
This is done through the use of a negative temperature resistor (NTC) for R6. Then, when the temperature of the detecting point rises, the NTC resistance decreases and makes the voltage at VSET decrease. Consequentially, the output current decreases, preventing the system from overheating.
Additionally, the AL5814Q has internal overtemperature protection (OTP). This is achieved by shutting the IC down when the junction temperature is over +160°C and turning it back on when the junction temperature drops by +30°C.
While we’ll still have to wait for self-driving cars and for the widespread adaptation of all-electrically powered cars, the incorporation of electronics into gas-powered and hybrid vehicles proceeds apace. LEDs are replacing incandescent bulbs, and as expected, many manufacturers are offering a wide range of LED driver-controllers, each optimized for its own specific application. Here are two examples:
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