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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