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UCC2804N
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UCC2804N - English Editing Encyclopedia Entry

Product Overview

Category

UCC2804N belongs to the category of integrated circuits (ICs) specifically designed for power management applications.

Use

This IC is commonly used in various power supply systems, including switch-mode power supplies (SMPS), battery chargers, and LED drivers.

Characteristics

  • UCC2804N is a high-performance voltage mode PWM controller.
  • It operates with a wide input voltage range, making it suitable for diverse applications.
  • The IC offers precise control over output voltage and current regulation.
  • It provides protection features such as overvoltage, undervoltage, and overcurrent protection.

Package and Quantity

UCC2804N is available in a standard 8-pin dual in-line package (DIP). It is typically sold in reels or tubes containing multiple units.

Specifications

  • Input Voltage Range: 10V to 30V
  • Output Voltage Range: 0V to 5V
  • Operating Temperature Range: -40°C to 85°C
  • Maximum Output Current: 100mA
  • Switching Frequency: 50kHz to 500kHz

Pin Configuration

The UCC2804N IC has the following pin configuration:

  1. VREF: Reference voltage input
  2. COMP: Error amplifier output
  3. CS: Current sense input
  4. GND: Ground reference
  5. RT/CT: Timing resistor/capacitor connection
  6. OUT: Output voltage
  7. VCC: Power supply input
  8. FB: Feedback input

Functional Features

  1. Voltage Mode Control: UCC2804N utilizes voltage mode control to regulate the output voltage by comparing it with a reference voltage.
  2. Error Amplifier: The built-in error amplifier ensures accurate feedback and control of the output voltage.
  3. Current Sensing: The IC incorporates a current sense input to monitor and regulate the output current.
  4. Protection Mechanisms: UCC2804N offers comprehensive protection features, including overvoltage, undervoltage, and overcurrent protection.
  5. Wide Input Voltage Range: The IC can operate within a wide input voltage range, providing flexibility in various power supply applications.

Advantages and Disadvantages

Advantages

  • Precise voltage and current regulation
  • Wide input voltage range
  • Comprehensive protection features
  • Compact and easy-to-use package

Disadvantages

  • Limited maximum output current capacity
  • Relatively low switching frequency range

Working Principles

UCC2804N operates based on the voltage mode control technique. It compares the output voltage with a reference voltage (VREF) using an error amplifier. Any deviation from the desired output voltage is amplified and used to adjust the duty cycle of the PWM signal. This adjustment controls the switching of the power MOSFET, regulating the output voltage accordingly.

The IC also incorporates a current sense input (CS) to monitor the output current. By continuously sensing the current, it ensures that the output remains within the specified limits.

Application Field Plans

UCC2804N finds extensive application in various power management systems, including: 1. Switch-mode power supplies (SMPS) 2. Battery chargers 3. LED drivers 4. DC-DC converters 5. Uninterruptible Power Supplies (UPS)

Alternative Models

For those seeking alternative options, the following models are worth considering: 1. UCC2804DW: Similar functionality, but available in a surface mount package. 2. UC3844N: Offers enhanced features such as adjustable switching frequency and soft-start capability. 3. TL494CN: Provides similar voltage mode control functionality with additional built-in oscillators.

In conclusion, UCC2804N is a versatile voltage mode PWM controller widely used in power supply systems. Its precise regulation, comprehensive protection features, and wide input voltage range make it an ideal choice for various applications.

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Énumérez 10 questions et réponses courantes liées à l'application de UCC2804N dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of UCC2804N in technical solutions:

  1. Q: What is UCC2804N? A: UCC2804N is a pulse width modulation (PWM) controller IC commonly used in power supply applications.

  2. Q: What is the purpose of UCC2804N in a power supply circuit? A: UCC2804N is used to regulate the output voltage of a power supply by controlling the duty cycle of the PWM signal.

  3. Q: What is the operating voltage range of UCC2804N? A: The operating voltage range of UCC2804N is typically between 8V and 35V.

  4. Q: How does UCC2804N control the duty cycle of the PWM signal? A: UCC2804N uses an internal oscillator and error amplifier to compare the feedback voltage with a reference voltage, adjusting the duty cycle accordingly.

  5. Q: Can UCC2804N be used in both buck and boost converter topologies? A: Yes, UCC2804N 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 of UCC2804N? A: The maximum switching frequency of UCC2804N is typically around 500kHz.

  7. Q: Does UCC2804N have built-in protection features? A: Yes, UCC2804N has built-in protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.

  8. Q: Can UCC2804N drive high-power MOSFETs directly? A: No, UCC2804N requires external MOSFET drivers to drive high-power MOSFETs.

  9. Q: What is the maximum output current that UCC2804N can handle? A: The maximum output current of UCC2804N depends on the external components used in the power supply circuit.

  10. Q: Are there any application notes or reference designs available for UCC2804N? A: Yes, Texas Instruments provides application notes and reference designs for UCC2804N, which can be found on their website.

Please note that the answers provided here are general and may vary depending on specific datasheet specifications and application requirements.