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VIPER22A IC: Equivalent, Datasheet, Pinout, and Circuit | Easybom VIPER22A, a popular SMPS controller IC from STMicroelectronics, has been extensively employed in AC to DC Converters in off-line power circuit designs. It consists of an integrated PWM controller and a power MOSFET. The MOSFET connects to the primary side of a power transformer. When switched, it will produce the required voltage.