UC3879DWTRG4

Frequency - Switching:	Up to 300kHz
Base Part Number:	UC3879
Supplier Device Package:	20-SOIC
Package / Case:	20-SOIC (0.295", 7.50mm Width)
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:	Tape & Reel (TR)

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UC3879DWTRG4 Application Field and Working Principle

UC3879DWTRG4 is a monolithic, current-mode, pulse width modulation (PWM) controller integrated circuit (IC). This type of IC is often used as a DC to DC switching regulator, and it receives input power from a direct current (DC) source and adjusts the level of output, typically editing the number of active pulses in the output pulse-width train during any given period of time.By regulating turn-off and turn-on times, PWM switching controllers are used to adjust power levels on the output. The additional control capability that PWM offers, over linear regulation techniques, makes it much more useful in the management of the supply chain.UC3879DWTRG4 is able to keep output voltage which is isolated (or not isolated) in steady state (when the load is fixed and stable) at low cost and with low power dissipation while operating with low noise and harmonic distortion. The operating frequency is adjustable and the output voltage can be preset.The primary benefit and application field of UC3879DWTRG4 is in DC to DC power conversion and signal regulation and control. For example, in power supplies, the possibility of using PWM switching regulation to smooth out the truncated source-generated square wave ensures consistent quality of output power.UC3879DWTRG4 is also capable of providing high efficiency in transformers and inductor-type applications, including multiple-output supplies switched in parallel, flyback supply designs, and boost and buck converters. These applications are particularly useful in automotive, medical, and mobile device markets.This type of IC is also commonly found in SMPS (switched-mode power supplies) control circuits and Telecom power supplies.The working principle of UC3879DWTRG4 is based on the error amplifying technique and the automatic frequency control (AFC) method. The error amplifier compares the feedback voltage and the reference voltage. The error signal generated is then used to control the gate parameters. The gate parameters are then used to adjust the output voltage. The output voltage is then monitored with a feedback loop. This loop is responsible for providing a setpoint to the error amplifier for maintaining the output voltage.The AFC circuit monitors the speed of the current within the PWM circuit and adjusts the switching frequency according to its speed. This keeps the output frequency from getting too fast or slow, preventing instability and ensuring each pulse is carried out at the correct speed. As the load current varies, the feedback loop will adjust the switching frequency to keep the output voltage within the desired range.The UC3879DWTRG4 is a low-cost and low-power PWM switching regulator with AFC that can be of great help in providing reliable economical DC to DC switching regulation with excellent noise reduction, high accuracy, and low power consumption. Its application fields include power supplies, switched mode power supplies (SMPS) control circuits, Telecom power supplies, automotive markets, medical markets, and mobile devices. With its ability to keep the output voltage steady in the presence of a load and the fact that the switching frequency can be adjusted automatically, the UC3879DWTRG4 can offer a cost-effective solution for any DC to DC regulator control need.

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