STMicroelectronics VIPER22A-E Manuals

The VIPer22A-E is a low power OFF-line SMPS primary switcher with the following features: Fixed 60 kHz switching frequency, 9 V to 38 V wide range VDD voltage, Current mode control, Auxiliary undervoltage lockout with hysteresis, High voltage start-up current source, Overtemperature, overcurrent and overvoltage protection with auto-restart.

This document is the datasheet for STEVAL-ILL026V1 3W non-isolated offline LED driver demonstration board based on the VIPer22A-E, which provides 350 mA constant current for LEDs and is capable of driving 3 x 1 W LEDs in series with high-precision constant current (± 5% tolerance).

This application note describes the functioning of the STEVAL-ILL026V1 non-isolated 3 W offline LED driver power supply designed using the VIPER22A-E low power offline SMPS primary switcher from STMicroelectronics. The circuit regulates the load current to 350 mA and generates about 10 V. The load is composed of three high-brightness (HB) LEDs, connected in series. The project does not provide safety isolation between the input and output. This document provides the power supply specification, circuit diagrams, the complete bill of materials, and reports the results of circuit testing.