ASL2417SHN

ASL2417SHN Enhanced two channel LED buck driver with limp-home Rev. 4 — 16 September 2019 Product data sheet 1. Introduction The ASL2417SHN is a two channel buck mode LED driver IC with a Limp-home mode. It delivers constant average DC current to LEDs independent of the input voltage. The ASL2417SHN supports up to two output channels. It means that with one driver IC, 1 or 2 LED strings can be driven independently of each other. It provides a cost effective design solution, specifically targeting automotive exterior and interior lighting applications. 2. General description The ASL2417SHN 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.1 Furthermore, the 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 ASL2417SHN buck driver gives a flexible system design which can be used to drive two LED strings with the same architecture. The ASL2417SHN provides an SPI interface for extensive control and diagnostic communication with an external microcontroller. Furthermore, the ASL2417SHN integrates a customer programmable Limp-home mode. It allows configurable operation in Limp-home mode in case SPI communication with the microcontroller has failed...