The IC is a combination of a PWM controller and a power mosfet and can work as a efficient AC to DC converter with very few external components. The controller can convert AC voltage from 85V to 265V and convert it to regulated DC voltage, it is commonly used as a replacement for transformer less power supply circuits. The Viper22A is popular SMPS buck controller device from the ViperXX series of ST Microelectronics. Other Switching Regulators: LM2596, LM2576 Rise time and Fall time 50ns and 100ns respectivelyĮquivalent for VIPER22A: VIPER12A, AP8012.The MOSFET is connected to the primary side a power transformer which when switched will produce the required output voltage based on transformer design. This controller IC consists of an in-built PWM controller with a power MOSFET. The VIPER22A is a Popular SMPS controller IC form STMicroelectronics that has been extensively used in AC to DC Converters in offline power circuit designs.
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