VIPER28HE

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Power management integrated circuits (PMICs) are widely used in modern electronics to control, monitor and improve the quality of electrical power in a device. The VIPER28HE is a power management integrated circuit with an integrated offline switch specifically designed for low start-up current applications, such as those in the automotive, industrial, appliance and communications markets. This article will discuss the application field and working principle of the VIPER28HE.

Application field

The VIPER28HE is a low-threshold, high-efficiency offline switch integrated circuit specifically designed for use in low start-up current applications. This makes it an ideal choice for applications in the automotive, industrial, appliance and communications markets, where power efficiency and reliability is paramount.

The chip is designed to provide an efficient and robust solution for powering road traffic, such as LED headlights and LED taillights, as well as industrial automation and process control systems, such as those found in factories, warehouses and other buildings. Additionally, it is suitable for a variety of other applications, such as motor control and smart meters.

The low-threshold and high-efficiency characteristics of the chip make it an ideal choice for portable devices, such as phones and tablets, where power consumption must be minimized. Additionally, the use of this IC makes it possible to power devices with a larger voltage range, such as those powered by batteries with a voltage as low as 0.9 V.

Working Principle

The VIPER28HE is an offline switching IC with an integrated low-threshold and high-efficiency synchronous rectifier. Its internal supply voltage regulator is composed of a voltage reference and error amplifiers, which control the switching duty cycle of the synchronous rectifier. This control allows the chip to operate in either discontinuous conduction mode (DCM) or continuous conduction mode (CCM), depending on the load.

The built-in main switch is synchronously driven by the internal PWM generator via a pair of low-on resistance MOSFETs and controlled through the error amplifier to maximize efficiency and minimize losses. The voltage regulation loop of the chip is capable of responding to line and load variations, and it can also automatically enter into burst mode operation when the load is light to further reduce power dissipation.

The VIPER28HE also has an integrated overvoltage protection circuit that can be used to protect the internal components from damage caused by an excessive supply voltage. Additionally, an overcurrent protection circuit is built in to protect the device from high current faults. Finally, the chip is also equipped with a thermal protection feature that shuts down the chip in the event of excessive die temperature.

In conclusion, the VIPER28HE is a low-threshold, high-efficiency offline switch integrated circuit specifically designed for use in low start-up current applications. It is suitable for powering a variety of applications, such as automotive, industrial, appliance and communications systems, as well as portable devices. The chip is equipped with an integrated synchronous rectifier, voltage reference, error amplifiers, overvoltage protection and overcurrent protection, making it an ideal choice for power efficient and reliable systems.

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