UC3879NG4

Frequency - Switching:	Up to 300kHz
Base Part Number:	UC3879
Supplier Device Package:	20-PDIP
Package / Case:	20-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	9 V ~ 20 V
Output Phases:	1
Number of Outputs:	4
Topology:	Half-Bridge
Output Configuration:	Positive
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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UC3879NG4 is a double current-mode frequency pulse-width modulation (PWM) controller manufactured by Texas Instruments. It supports switching frequencies from 100 kHz to 1 MHz and is designed for residential and commercial applications. The UC3879NG4 is used for low-EE, PFC, and SMPS solutions implemented in power adapter, server power supplies, and UPS systems.

Overview

The UC3879NG4 is a device belonging to Texas Instruments\' family of voltage regulators and DC DC Switching Controllers. It is a frequency pulse-width modulation (PWM) controller designed to provide power solutions in the range of residential and commercial applications. The UC3879NG4 utilizes a double current-mode, which results in faster load transient and reduces both power stress and the sensitivity of the internal devices. In addition, it supports a wide range of switching frequencies, from 100 kHz to 1 MHz, which makes it suitable for a variety of applications.

Applications

The UC3879NG4 is used in several power converter solutions, such as switch-mode power supplies, power adapter solutions, server power supplies and uninterruptible power supplies (UPS) systems. With its support of switching frequencies from 100 kHz to 1 MHz and double current-mode, the UC3879NG4 is ideal for low-EE, PFC and SMPS solutions.

Working Principle

The UC3879NG4 is a double current-mode pulse-width modulation (PWM) controller wherein two current-sensing comparators select the output voltage level of the power supply. The two comparators are designated as the Positive High Voltage Comparator (P-HVC) and the Negative High Voltage Comparator (N-HVC) to indicate the direction of the voltage slew that each comparator is sensing.The P-HVC and N-HVC are designed to compare the average values of their respective current sources, which can be either a voltage or current source. Depending on the voltage or current levels of the two current sources, one comparator will have higher voltage or current levels, and the controller will adjust the channel\'s output voltage close to the higher value of the two. This mode of operation results in a more reliable switching performance, faster load transient and reduced stress on the power supply and its internal components.

Conclusion

The UC3879NG4 is a double current-mode pulse-width modulation (PWM) controller developed by Texas Instruments. It provides solutions for low-EE, PFC and SMPS applications, and supports a wide range of switching frequencies, from 100 kHz to 1 MHz. Because of its double current-mode, it reduces power stress and internal device sensitivity; this is beneficial for applications such as switch-mode power supplies, power adapter solutions, server power supplies, and uninterruptible power supplies (UPS) systems.

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