UC2879N

Product Overview

Category: Integrated Circuit
Use: Power Management
Characteristics: High Efficiency, Low Power Consumption
Package: DIP-16
Essence: Voltage Mode PWM Controller
Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

Input Voltage Range: 8V to 20V
Output Voltage Range: 0.8V to 5.5V
Switching Frequency: 100kHz to 1MHz
Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

VCC: Power Supply Input
GND: Ground
COMP: Error Amplifier Output
FB: Feedback Input
CS: Current Sense Input
SS/TR: Soft-Start/Tracking Input
RT/CT: Oscillator Timing Components
SYNC: Synchronization Input
DRVH: High-Side Gate Drive Output
DRVL: Low-Side Gate Drive Output
VREF: Reference Voltage Output
UVLO: Undervoltage Lockout Input
OVP: Overvoltage Protection Input
EN/UV: Enable/Undervoltage Lockout Input
PGND: Power Ground
VCC: Power Supply Input

Functional Features

Voltage mode control with adjustable output voltage
Wide input voltage range for versatile applications
High efficiency operation for reduced power consumption
Adjustable switching frequency for optimization
Soft-start function for controlled startup
Synchronization capability for multi-phase operation
Comprehensive protection features (undervoltage lockout, overvoltage protection)

Advantages

High efficiency operation leads to energy savings
Wide input voltage range allows for flexibility in power supply selection
Adjustable output voltage enables customization for specific applications
Comprehensive protection features enhance system reliability
Synchronization capability facilitates multi-phase power management

Disadvantages

Limited output voltage range (0.8V to 5.5V)
Requires external timing components for oscillator operation
DIP-16 package may limit space-constrained designs

Working Principles

The UC2879N is a voltage mode PWM controller that regulates the output voltage based on feedback from the FB pin. It operates by comparing the feedback voltage with an internal reference voltage and adjusts the duty cycle of the output waveform accordingly. The switching frequency can be adjusted using external timing components connected to the RT/CT pins. The soft-start function gradually ramps up the output voltage during startup, preventing excessive inrush current. The device also provides comprehensive protection features such as undervoltage lockout and overvoltage protection.

Detailed Application Field Plans

The UC2879N is commonly used in various power management applications, including:

Switching Power Supplies
DC-DC Converters
LED Lighting Systems
Battery Chargers
Industrial Control Systems

Detailed and Complete Alternative Models

UC3842: Voltage Mode PWM Controller, DIP-8 package
UC3843: Voltage Mode PWM Controller, SOIC-8 package
UC3844: Voltage Mode PWM Controller, DIP-8 package
UC3845: Voltage Mode PWM Controller, SOIC-8 package
UC2854: Current Mode PWM Controller, DIP-16 package

These alternative models offer similar functionality and can be considered as substitutes for the UC2879N depending on specific requirements.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací UC2879N v technických řešeních

Sure! Here are 10 common questions and answers related to the application of UC2879N in technical solutions:

Q: What is UC2879N? A: UC2879N is a specific integrated circuit (IC) used for power management applications.
Q: What are the typical applications of UC2879N? A: UC2879N is commonly used in various power supply designs, such as offline flyback converters or LED drivers.
Q: What is the input voltage range supported by UC2879N? A: UC2879N supports a wide input voltage range, typically from 85V AC to 265V AC.
Q: What is the maximum output power that can be achieved using UC2879N? A: The maximum output power depends on the specific design and implementation, but UC2879N can handle power levels up to several hundred watts.
Q: Does UC2879N have built-in protection features? A: Yes, UC2879N incorporates various protection features like overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown.
Q: Can UC2879N operate in continuous or discontinuous conduction mode? A: UC2879N can operate in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), depending on the specific design requirements.
Q: Is UC2879N suitable for high-frequency switching applications? A: Yes, UC2879N is designed to operate at high switching frequencies, making it suitable for applications requiring efficient power conversion.
Q: Does UC2879N support dimming control for LED lighting applications? A: Yes, UC2879N provides support for dimming control, allowing precise brightness adjustment in LED lighting applications.
Q: Can UC2879N be used in both isolated and non-isolated power supply designs? A: Yes, UC2879N can be used in both isolated (e.g., flyback) and non-isolated (e.g., buck) power supply designs, providing flexibility in application.
Q: Are there any reference designs or application notes available for UC2879N? A: Yes, the manufacturer of UC2879N typically provides reference designs and application notes that offer guidance on using the IC effectively in various technical solutions.

Please note that the answers provided here are general and may vary depending on the specific implementation and design considerations.