VIPER50-E

The VIPER50-E is an integrated circuit designed as a low cost single-phase PWM controller. Developed by STMicroelectronics, the device\'s power stage uses an industry standard shielded package to deliver optimum power efficiency and increased flexibility.

The industry standard shielded package design is made to accommodate the thermal requirements of the power stage, allowing for an ultra-compact solution. It comes with numerous features, such as: overcurrent protection (HPF), synchronous rectification, and programmable soft start. Additionally, the device is also equipped with a voltage mode control architecture, which provides precise current control from light-load to full-load operations.

The VIPER50-E is a common and popular choice for AC/DC applications, including off-line HVAC systems, air conditioners, and appliances. The typical applications are converters that operate near their maximum power ratings, such as Constant Power, Constant Voltage, and Constant Current solutions. The overcurrent protection, synchronous rectification, and current mode control make the VIPER50-E a reliable platform upon which numerous new applications can be built.

Application Field and Working Principles

The VIPER50-E was designed to provide efficient solutions for off-line switcher applications. The power stage of the device is composed of a high-speed power MOSFET switch and various control circuitry, all integrated into a single package. The power stage is controlled by an internal or external reference, or a selected modulation technique. The device\'s core is the voltage-mode controller, which constantly monitors power output and adapts to any dynamic changes in the operating environment. The device is capable of operating as a constant power regulator, as well as a constant voltage/current regulator. The device also includes variable frequency resonant controllers, allowing the user to make use of high frequency switching schemes. The single-package features make the VIPER50-E ideal for a large range of AC/DC applications, such as off-line switchers.

The VIPER50-E device is designed to generate a low-speed (0 to 50khz) switching pulse width modulation (PWM) waveform to drive an external switching MOSFET in a half-bridge configuration. The device works in a voltage-mode control architecture. The main features of this PWM controller are its precise on-time control, fast transient response, and low component count.

The device is capable of generating PWM for constant power, constant voltage, and constant current regulation. The device has an internal comparator and sense resistor to measure the output current, which it uses to regulate the output voltage to keep the output current constant. The device also has an internal temperature sensor, which allows it to accurately sense the ambient temperature. This temperature sensor helps to ensure that the power components do not overheat during operation.

The device also contains an internal oscillator, which can be programmed to offer an adjustable switching frequency. This feature allows for reduced noise levels and increased efficiency. The device includes over-current protection, which helps protect the load from any power surges or overloading. The device also supports pulse-by-pulse current limiting.

The VIPER50-E device is a great way to generate low-cost, off-line switchers. Its versatile design allows users to create a wide range of applications, from providing a constant quality of power to air conditioners and appliances, to creating new and innovative designs for medical and industrial applications. The device\'s small size and shielded package make it a great choice for a wide range of AC/DC applications.