VIPer20/SP/DIP - VIPer20A/ASP/ADIP SMPS PRIMARY I.C. is a power supply IC with adjustable switching frequency, current mode control, soft start and shut down control, automatic burst mode operation in stand-by condition, internally trimmed zener reference, undervoltage lock-out with hysteresis, integrated start-up supply, avalanche rugged, overtemperature protection, low stand-by current and adjustable current limitation.