VN820

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The VN820 is a high-performance automatic standby power switch designed for use in applications where it is necessary to save power or prevent unintentional load turn-on. It is a type of power management integrated circuit (PMIC) and is categorized under the power distribution switches, load drivers, and subsystems. This versatile switch can be used to enable/disable power in many high-reliability contexts, such as distributed power supply management, dc-to-dc switching, and power supply sequencing.

The VN820 is designed to be suitable for high-speed applications and provides a high level of reliability with its dynamic current monitoring. It is used to automatically switch between two power sources when the primary power source fails. The load is either temporarily routed to the secondary power source while the primary is switched off or to the primary source when it recovers. The VN820 also provides protection against overcurrent, overvoltage, and over temperature.

The principle of operation of the VN820 is based on a voltage-sensing circuit, where a voltage differential is monitored between two pins. When the voltage is outside the predetermined range, the switch will operate depending on the external control configuration. The control is centralized on three pins: power input pin, standby input pin, and output pin. The power input pin is used to supply the initial voltage and the standby input pin is used to supply the voltage that is monitored for switch activation.

The VN820 is also designed to be fully automated with advanced features such as adjustable switching hysteresis and adjustable dead-time suppression. It can also be programmed to detect and switch between reverse polarity and overvoltage protection. This enables the VN820 to provide a more specific range of protection when a load is connected to its output.

In addition to offering over-current protection, the VN820 provides multiple operating modes including proportional output voltage, instantaneous feedback voltage, logarithmic output voltage, and power-loss fade-out voltage. The VN820 also supports an adjustable dead time, enabling a specific selection of output time frames to be set and monitored. The adjustable dead time can be used to switch between the two sources more accurately, preventing unintentional turn-on during the transition period.

The VN820 is a highly reliable power switch for various applications. It provides robust protection against damages due to overloads and overcurrent conditions. It is easy to program for specific applications, providing flexibility for custom implementations. With its adjustable hysteresis, adjustable dead-time suppression, and multiple operating modes, the VN820 is designed to meet the requirements of high-performance switching applications and ensure continuity of service.

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