The independent 7-bit PWM dimming for all channels of the ALED1262ZT enables flexible control of rear, brake and indicator lights with dynamic effects. Each channel provides a constant output current at 19 V for strings of multiple LEDs connected in series. The adjustment possibility from 6 mA to 60 mA guarantees a wide dimming range with a high maximum brightness. The LED lighting driver responds to I2C commands from a host microcontroller and provides two pre-programmed configurations for stand-alone operation for additional flexibility.
The ALED1262ZT's diagnostic functions, which include circuit break detection in LEDs and an over-temperature warning with shutdown function, ensure a high level of robustness and stability over a long period of use. The input voltage range from 5.5 V to 38 V enables use in systems that are supplied directly from the vehicle electrical system. In addition, the ALED1262ZT is designed for low-noise operation by slowly switching the individual channels on and off and the spread-spectrum clock to facilitate integration into the rest of the on-board electronics.
The chip has a thermally efficient 6.4 mm x 7.8 mm HTSSOP24 exposed pad package. Production has already commenced and the price is expected to be USD 1.00 (from 1,000 units).
ST supplies the Evaluation Board STEVAL-LLL002V1 for this device, which can be purchased directly from the chip manufacturer or from distributors. Designers can use it to explore the features of the ALED1262ZT and get a jump start for new lighting designs.
More information: ALED1262ZT