Texas Instruments
Bild kan vara representation.
Se specifikationer för produktinformation.
UC2879N
Visa detalj Datablad

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

  1. VCC: Power Supply Input
  2. GND: Ground
  3. COMP: Error Amplifier Output
  4. FB: Feedback Input
  5. CS: Current Sense Input
  6. SS/TR: Soft-Start/Tracking Input
  7. RT/CT: Oscillator Timing Components
  8. SYNC: Synchronization Input
  9. DRVH: High-Side Gate Drive Output
  10. DRVL: Low-Side Gate Drive Output
  11. VREF: Reference Voltage Output
  12. UVLO: Undervoltage Lockout Input
  13. OVP: Overvoltage Protection Input
  14. EN/UV: Enable/Undervoltage Lockout Input
  15. PGND: Power Ground
  16. 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:

  1. Switching Power Supplies
  2. DC-DC Converters
  3. LED Lighting Systems
  4. Battery Chargers
  5. Industrial Control Systems

Detailed and Complete Alternative Models

  1. UC3842: Voltage Mode PWM Controller, DIP-8 package
  2. UC3843: Voltage Mode PWM Controller, SOIC-8 package
  3. UC3844: Voltage Mode PWM Controller, DIP-8 package
  4. UC3845: Voltage Mode PWM Controller, SOIC-8 package
  5. 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.

Word count: 420 words

Lista 10 Vanliga frågor och svar relaterade till tillämpningen av UC2879N i tekniska lösningar

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

  1. Q: What is UC2879N? A: UC2879N is a specific integrated circuit (IC) used for power management applications.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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.