The ASL3416SHN is a three channel buck mode LED driver IC delivering constant average DC current to LEDs independent of the input voltage. The ASL3416SHN supports up to three output channels. It means that with one driver IC 1, 2 or 3 LED strings can be driven independently of each other. It provides a cost effective design solution, specifically targeting automotive exterior and interior lighting applications.
The ASL3416SHN has a hysteretic buck DC-to-DC topology. With input voltages from 10 V to 80 V, it allows maximum flexibility on output voltages for each channel, enabling applications with up to 20 LEDs. It also provides an output current of up to and above 1.5 A per channel. Furthermore, two output channels can be connected together to provide an even higher current. It drives an external high-side N channel MOSFET from an internally regulated adjustable supply. The ASL3416SHN buck driver gives a flexible system design which can be used to drive three LED strings with the same architecture
The ASL3416SHN provides an SPI interface for extensive control and diagnostic communication with an external microcontroller.
The ASL3416SHN offers an adjustable hysteresis for optimizing external components as well as minimizing LED current ripple. In addition, the ASL3416SHN provides an output voltage of up to 70 V. It has a measurement capability that can be used to identify LED open or short circuit conditions. The microcontroller can read this voltage and use it to detect open or short circuit conditions. There are also additional diagnostic features such as current reached status.
Additional features include input under-voltage lockout and thermal shutdown when the junction temperature of the ASL3416SHN exceeds +175 °C.
It is housed in a very small HVQFN32 pin package with an exposed thermal pad and is designed to meet the stringent requirements of automotive applications. It is fully AEC Q100 grade 1 qualified. It operates over the ambient automotive temperature range of -40 °C to +125 °C.