ISL61851FCBZ

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ISL61851FCBZ is a Hot Swap Controller. It is designed for hot plug-in/out of cards, modules or other backplane solutions as well as other applications that require robust hot swap control and protection. The device provides independent and programmable voltage, current, and charge control to enable robust system-level hot swap control. It also provides extensive fault monitoring, diode emulation functionality, and power sequencing.

Application Field

ISL61851FCBZ can be used as a Hot Swap Controller in a wide range of applications. The most common use cases are: servers, graphics cards, communications gear, consumer electronics, and automotive electronics. For each application, there are specific requirements for the Hot Swap Controller so it is important to make sure that the device chosen is suitable for the specific application.

Additionally, the ISL61851FCBZ is also suitable for use in applications where high efficiency and low quiescent current draw are required, such as in battery-powered or energy-conscious designs. The device is also suitable for high-reliability or high-temperature design margins, such as those found in industrial and automotive applications.

Working Principle

ISL61851FCBZ\'s working principle is based on the principle of negative voltage control. It monitors the voltage across the Hot Swap output and compares it to the programmed voltage setpoint. If the voltage falls below that setpoint, the controller reduces the load current to maintain the setpoint. This allows the device to regulate its output voltage over a certain range and keep it stable, regardless of the load conditions.

The device also offers an internal current-limit circuit, in which the Hot Swap output current will be reduced whenever the programmed output current limit is exceeded. This current-limit feature helps to ensure that power load and system current draw are within safe limits at all times.

The device also features a unique charge control feature, which is designed to limit the total amount of charge that can be delivered to a load. This prevents the user from overloading the load with too much charge, leading to possible damage.

ISL61851FCBZ also offers extensive fault monitoring and diode emulation features. The fault monitoring circuits ensure that the system is operating properly, and the diode emulation features ensure that any load current is always supplied in the proper direction, eliminating the need for an external diode.

Finally, the device also has power sequencing capability, allowing it to control the power-up and power-down sequence of multiple voltage rails in a system. This helps to ensure that all of the system components are powered on and off in the correct order, maximizing system reliability.

In summary, ISL61851FCBZ is a hot swap controller designed for use in a wide range of applications. It offers robust hot swap control, current and charge limitation, fault monitoring, diode emulation and power sequencing capabilities, making it a great choice for many hot-swap applications.

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