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UCC2804D
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UCC2804D

Product Overview

Category

UCC2804D belongs to the category of integrated circuits (ICs).

Use

It is commonly used as a pulse width modulation (PWM) controller.

Characteristics

  • UCC2804D is a high-performance PWM controller designed for offline and DC-to-DC converters.
  • It operates with a fixed frequency of 50kHz, allowing for easy synchronization.
  • The device features an internal soft-start function, which prevents excessive inrush current during startup.
  • UCC2804D offers precise duty cycle control and excellent line and load regulation.
  • It provides protection against overcurrent and overvoltage conditions.

Package

UCC2804D is available in a standard 8-pin SOIC (Small Outline Integrated Circuit) package.

Essence

The essence of UCC2804D lies in its ability to regulate and control the duty cycle of a PWM signal, making it suitable for various power conversion applications.

Packaging/Quantity

UCC2804D is typically packaged in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

  • Input Voltage Range: 7V to 25V
  • Output Voltage Range: 0V to VCC
  • Operating Temperature Range: -40°C to 85°C
  • Duty Cycle Range: 0% to 100%
  • Maximum Oscillator Frequency: 500kHz
  • Maximum Output Current: 200mA

Detailed Pin Configuration

  1. COMP: Compensation pin for external error amplifier.
  2. CS: Current sense input for overcurrent protection.
  3. GND: Ground reference for the IC.
  4. RT/CT: Timing components connection for setting oscillator frequency and soft-start time.
  5. VREF: Reference voltage output for error amplifier.
  6. VCC: Positive supply voltage input.
  7. OUT: Output pin for the PWM signal.
  8. SS/TR: Soft-start and shutdown control pin.

Functional Features

  • Precise duty cycle control for accurate power regulation.
  • Internal soft-start function to prevent inrush current during startup.
  • Overcurrent protection for enhanced system safety.
  • Excellent line and load regulation for stable output voltage.
  • Synchronization capability with external clock source.

Advantages and Disadvantages

Advantages

  • High-performance PWM controller suitable for various power conversion applications.
  • Fixed frequency operation simplifies synchronization.
  • Internal soft-start function prevents excessive inrush current.
  • Provides protection against overcurrent and overvoltage conditions.
  • Precise duty cycle control and excellent regulation ensure stable output.

Disadvantages

  • Limited maximum output current of 200mA.
  • Operating temperature range may not be suitable for extreme environments.

Working Principles

UCC2804D operates by comparing a feedback voltage (from the error amplifier) with a sawtooth waveform generated by an internal oscillator. Based on this comparison, the duty cycle of the PWM signal is adjusted to regulate the output voltage. The soft-start function gradually increases the duty cycle during startup to avoid sudden high currents. Overcurrent and overvoltage protection mechanisms ensure the safety of the system.

Detailed Application Field Plans

UCC2804D finds extensive application in various power conversion systems, including: 1. Switching power supplies 2. DC-to-DC converters 3. LED drivers 4. Battery chargers 5. Motor control circuits

Detailed and Complete Alternative Models

Some alternative models that can be considered as substitutes for UCC2804D are: 1. UC3842 2. SG3525 3. TL494 4. IRS2153D 5. MC34063

These alternatives offer similar functionality and can be used depending on specific requirements and availability.

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แสดงรายการคำถามและคำตอบทั่วไป 10 ข้อที่เกี่ยวข้องกับการใช้ UCC2804D ในโซลูชันทางเทคนิค

Sure! Here are 10 common questions and answers related to the application of UCC2804D in technical solutions:

  1. Q: What is UCC2804D? A: UCC2804D is a pulse width modulation (PWM) controller IC commonly used in power supply applications.

  2. Q: What is the purpose of UCC2804D in a power supply circuit? A: UCC2804D is used to regulate the output voltage of the power supply by controlling the duty cycle of the PWM signal.

  3. Q: How does UCC2804D control the duty cycle? A: UCC2804D compares the feedback voltage with a reference voltage and adjusts the duty cycle accordingly to maintain a stable output voltage.

  4. Q: What is the maximum input voltage that UCC2804D can handle? A: The maximum input voltage for UCC2804D is typically around 30V.

  5. Q: Can UCC2804D be used in both buck and boost converter topologies? A: Yes, UCC2804D can be used in both buck and boost converter topologies, as well as other types of power supply circuits.

  6. Q: What is the maximum switching frequency supported by UCC2804D? A: The maximum switching frequency of UCC2804D is typically around 500kHz.

  7. Q: Does UCC2804D have built-in protection features? A: Yes, UCC2804D has built-in protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.

  8. Q: Can UCC2804D operate in a wide temperature range? A: Yes, UCC2804D is designed to operate in a wide temperature range, typically from -40°C to 85°C.

  9. Q: What is the typical output current capability of UCC2804D? A: The typical output current capability of UCC2804D is around 200mA.

  10. Q: Are there any application notes or reference designs available for UCC2804D? A: Yes, Texas Instruments provides application notes and reference designs that can help in implementing UCC2804D in various power supply applications.

Please note that the answers provided here are general and may vary depending on the specific datasheet and manufacturer's specifications for UCC2804D.