UCC3921N

Programmable Features:	Auto Retry, Circuit Breaker, Current Limit, Fault Timeout, Latched Fault
Base Part Number:	UCC3921
Feature Pins:	CT, IMAX, PL, SDFLTCH
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Current - Supply:	1mA
Operating Temperature:	0°C ~ 70°C
Current - Output (Max):	--
Voltage - Supply:	-48V
Series:	--
Features:	UVLO
Applications:	General Purpose
Internal Switch(s):	No
Number of Channels:	1
Type:	Hot Swap Controller
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tube

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Introduction of UCC3921N Application Field and Working Principle

PMIC - Hot Swap Controllers are mainly used to control and provide electrical current in myriad industrial fields. UCC3921N is a power management integrated circuit with hot swap capability, which provides telecom-grade DC power systems for intelligent embedded and distributed power supply applications. The main advantage of this controller is its reliability, as it is designed to protect the system from damage due to hot plugging in AC and DC bus systems.

Application Field of UCC3921N

UCC3921N is the best choice for complete power management solutions, ranging from the low power embedded market to high-power telecom, data centre and server applications. It is an excellent alternative for static hot swap applications, especially for integrated systems with high power density, where the weight and size of the power load require control and protection.UCC3921N is suitable for providing power to systems with up to eight supplies and up to 3.2A supply current. It is also suitable for providing safe power in a wide range of voltage and power levels. This power controller is capable of controlling the power up to 48V and 6A.The UCC3921N is also capable of controlling three different loads with the same power supply. It can divide the CBBT (conversion before break before transition) into three operating phases, and can change the operating voltage without interrupting the load side. This makes it more flexible and easier to use in various applications.The UCC3921N has integrated power control and various hot swap functions. It can guarantee the most safety and energy saving computing environment for the user. Its unique design includes power management, protection and multiple measurement functional blocks, which makes it ideal for distributed applications. In addition, it has a wide operating temperature range to satisfy a variety of industrial applications.

Working Principle of UCC3921N

When applying power to the DC power system, the UCC3921N starts by conducting a power-on control cycle. The integrated monitoring circuit detects abnormal voltage, current or temperature levels and triggers the low power mode to enable the safest possible power control.The UCC3921N switches the power supply during operation, according to the selected pre-defined voltage and current settings. The voltage settings are done based on a reference current, and when the reference current is exceeded, the UCC3921N begins to turn off the load to prevent overload.The over-current protection (OCP) circuit is used to protect the module from over current. When a predetermined over current threshold is reached, the UCC3921N immediately triggers zero-crossing transition to stop the load from being overloaded.The UCC3921N also provides protection from short circuit and reverse flow. The short circuit protection (SCP) circuit limits the output current to an Opera maximum, thus protecting the circuit from any accidental overloads. The reverse flow protection circuit prevents the system from receiving any reverse current from the load.On the other hand, over-voltage protection (OVP) is used to protect the system from over voltage. When the output voltage exceeds the OVP threshold, the UCC3921N shuts down the output voltage to protect the system.

Conclusion

UCC3921N power controller is a highly reliable and sophisticated power management IC designed to provide safe and reliable power control systems. Its versatile functions and advanced technology make it a superior power management solution for television, gaming console, automotive, IT and other distributed power systems. Its special features, such as over current and over voltage protection, make it an ideal power management system for distributed industrial applications.

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