This document describes the STMicroelectronics STEVAL-ILL005V1 VIPer12A-E offline constant current driver for high-intensity LEDs. The driver can drive from 1 to 4 LEDs and has selectable constant current outputs: 350 mA, 700 mA, and 1.05 A. The input voltage range is 90 to 264 VAC, compliant with EN55022 class B for EMI.