STMicroelectronics VIPER12AS: Low-Power Offline Switched-Mode Power Supply Primary Switcher

The VIPER12AS from STMicroelectronics is a highly integrated PWM controller designed to construct a cost-effective and compact switched-mode power supply (SMPS) with minimal external components. This device is part of the VIPerPlus family and is well-suited for low-power applications, offering an excellent solution for auxiliary power supplies, standby power supplies, and other low-power electrical converters.

Featuring an 800V avalanche-rugged power section, the VIPER12AS provides robustness and reliability, which makes it an ideal choice for applications that may experience high voltage spikes or surges. The device integrates a PWM controller and a high-voltage MOSFET in a single package, simplifying the design process and reducing the overall footprint of the power supply on the PCB.

One of the key benefits of the VIPER12AS is its energy-saving capabilities. It includes a built-in high-voltage startup circuit that allows the power supply to start up efficiently, while the quiescent current is very low, reducing power consumption when the device is in standby mode. This makes the VIPER12AS compliant with energy-saving regulations and standards, which is increasingly important in today's energy-conscious market.

The VIPER12AS also features several protection mechanisms to ensure the longevity and safety of the power supply. These include thermal shutdown, overvoltage protection, and overload protection. In the event of a fault condition, the VIPER12AS is designed to protect itself and the system it powers, which helps to prevent damage and reduces the risk of failure.

With its adjustable operating frequency up to 200 kHz, designers can optimize the size of the transformer and the output filter, which allows for a more compact and cost-effective power supply design. Additionally, the frequency jittering feature helps to reduce electromagnetic interference (EMI), further enhancing the performance of the end application.

In summary, the VIPER12AS is a versatile and efficient solution for developing low-power SMPS with the quality and reliability expected from STMicroelectronics. Its integration of key features and protections makes it a smart choice for designers looking to create energy-efficient and space-saving power supplies.