UCC3921DG4

UCC3921DG4 is a programmable hot swap controller by Texas Instruments and it is part of TI\'s Power Management IC (PMIC) lineup that released in 2020. This controller was designed to perform some of the critical functions needed in a system to protect the system from any hazardous environment that may cause a system failure. The UCC3921DG4 is capable of providing Power Over Temperature (POWOT), Voltage Over-Voltage and Over-Current Protection (VOP/OCP). It also has over twenty setting points, adjustable input current limit and delay control.

Application Field of UCC3921DG4:

The UCC3921DG4 is specially designed for hot swap applications in data centers, telecom systems, set-top boxes and enterprise designs. It supports all high-density, high-performance and low power applications with reduced board space. It features a wide input voltage range of 4.5V to 16.5V, high-side current limit and power-good indication. It also has a temperature sensor for point-of-load monitoring and protection, so that it can detect any rise in temperature in order to protect the system from system crashes.

Working Principle of UCC3921DG4:

The UCC3921DG4 is designed to provide the highest level of protection for hot swap applications. The controller works by controlling two external MOSFETs, one at the high side and one at the low side. It monitors input voltages and any rise in temperature using the on-board temperature sensor as well as any over-current protection. It can quickly detect any rise in voltage or temperature and shut down the system in order to protect it. Moreover, it can precisely set input current limit and delay control in order to protect the system.

When the input voltage is applied to the system, the UCC3921DG4 quickly detects it and starts to monitor the system for the current parameters and temperature. If any parameter or temperature is found to be out of the set range, the controller takes the necessary steps to shut down the system before any damage is caused. Furthermore, if any over-current situation is detected, the controller prevents the current from reaching the system by blocking it on the MOSFETs and thus, the system is protected.

To conclude, the UCC3921DG4 is an ideal choice for hot swap applications in data centers, telecom systems and other high-performance applications as it can protect the system from high temperatures as well as over-voltage and over-current protection. It also features wide input voltage range, precision current limit and other features that make it a perfect choice for hot swap applications.