The IS32LT3961 from Lumissil Microsystems is a PWM Dimmable Buck Regulator LED Driver that is ideal for automotive matrix lights, automotive turn/stop lights, daytime running lamps (DRLs), fog light, map light, and motorcycle headlight applications. It requires a DC supply of 5 - 60 V and provides an output current of up to 2 A. This LED driver integrates an N-channel MOSFET to operate in a buck configuration and externally connects a resistor at the high side to maintain a steady LED output current, thereby allowing the output voltage to be automatically adjusted for a wide range of LED configurations. It runs in fixed frequency mode during switching and configures the on-time using an external resistor connected between the VCC and TON pins (switching frequency). This driver dithers the switching frequency to allow the electromagnetic energy to spread over a wider frequency band, which helps in optimizing the EMI performance.
This AEC-Q100-qualified LED driver includes LED binning function, LED over-temperature thermal roll-off protection, built-in robust fault protection, and reporting functionalities to prevent short-circuit-related damages. This LED driver is available in a surface-mount package that measures 5.10 x 6.40 x 1.20 mm.
