UCC3913NG4

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UCC3913NG4 Application Field and Working Principle

The UCC3913NG4 Hot Swap Controllers from Texas Instruments are designed to protect and control components that are connected to a DC voltage source. This high performance, highly efficient controller has been designed for the hot swap protection of multiple devices on a single-voltage system. The UCC3913NG4 is designed to provide economical, versatile and rugged protection for data and power devices.

Features

The UCC3913NG4 Hot Swap Controllers provide the following features:

• Protects against current overload and short-circuit conditions
• High accuracy current sense threshold
• Low charge/discharge current threshold
• Integrated device reset and thermal shutdown
• Low gate charge (typ. 0.2nC) and gate impedance (typ. 0.2Ω)
• Very low input impedance
• Integrated overtemperature comparator with hysteresis
• Very low power consumption in Active mode

Applications

The UCC3913NG4 Hot Swap Controllers are ideal for applications requiring hot swap protection, such as rack-mounted servers, network switches, telecom systems, base-stations, power distribution systems and portable devices.

The controllers are designed for applications that require protection and control of multiple devices connected to a single DC power source. This could include systems with multiple supply rails such as +5V, +12V and -12V, or redundant supplies such as dual redundant 12V supplies.

Working Principle

When the UCC3913NG4 Hot Swap Controllers are connected to the system, they detect the presence of a valid supply voltage and a valid load voltage. In the event that either of these conditions are true, the controller will turn on and allow current to the load. The controllers also provide current overload protection, short circuit protection and regulated current sources.

When the system is powered up, the UCC3913NG4 Hot Swap Controllers will detect the supply and load voltages and turn on the MOSFET. This allows the current to flow to the load, while also performing current overload and short circuit protection.

The controller also provides an internal current source that can be used to provide uniform supply of current to the system. This is especially useful when the system consists of multiple rails, as it ensures that all rails are delivering the same amount of current.

Once the device is powered, the UCC3913NG4 Hot Swap Controllers will monitor the supply and load voltages and adjust the current limit accordingly. Additionally, the controller provides an integrated thermal shutdown. This prevents the system from exceeding its temperature limits, ensuring safe operation of the system.

Conclusion

The UCC3913NG4 Hot Swap Controllers from Texas Instruments are an ideal choice for applications that require hot swap protection for multiple devices on a single voltage system. These controllers provide protection from current overload, short circuit conditions and regulate input current sources. They are also designed with a built-in thermal shutdown circuit, providing additional protection and ensuring safe operation.

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