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UCC28722DBVT
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UCC28722DBVT

Product Overview

Category

UCC28722DBVT belongs to the category of integrated circuits (ICs) used in power management applications.

Use

This IC is specifically designed for offline flyback converters, which are commonly used in various electronic devices and appliances.

Characteristics

  • UCC28722DBVT is a highly efficient and compact device that enables power conversion in flyback converters.
  • It incorporates advanced features such as primary-side regulation (PSR) and frequency jittering to enhance performance.
  • The IC operates at high switching frequencies, allowing for smaller magnetics and reduced overall system size.
  • It offers excellent transient response and load regulation, ensuring stable power delivery to the load.

Package and Quantity

UCC28722DBVT is available in a small SOT-23 package. It is typically sold in reels containing a specified quantity of units, suitable for automated assembly processes.

Specifications

  • Input voltage range: 85V to 265V AC
  • Output voltage range: Adjustable, depending on application requirements
  • Maximum output power: Up to 10W
  • Switching frequency: Programmable, typically ranging from 50kHz to 150kHz
  • Efficiency: High efficiency, typically above 90%
  • Operating temperature range: -40°C to +125°C

Pin Configuration

The UCC28722DBVT IC has the following pin configuration:

  1. VDD: Power supply input for the IC.
  2. FB: Feedback pin for regulating the output voltage.
  3. COMP: Compensation pin for stability control.
  4. CS: Current sense pin for current monitoring.
  5. GND: Ground reference for the IC.
  6. DRAIN: Primary-side switch drain pin.
  7. SOURCE: Primary-side switch source pin.

Functional Features

  • Primary-side regulation (PSR): Eliminates the need for an optocoupler and secondary-side feedback circuitry, simplifying the design and reducing cost.
  • Frequency jittering: Reduces electromagnetic interference (EMI) emissions, ensuring compliance with regulatory standards.
  • Cycle-by-cycle current limit: Provides protection against overcurrent conditions, enhancing system reliability.
  • Soft-start: Gradually ramps up the output voltage during startup, preventing excessive inrush current.

Advantages

  • Compact size and high efficiency enable miniaturization of power supply designs.
  • Primary-side regulation eliminates the need for optocouplers, reducing component count and cost.
  • Frequency jittering reduces EMI emissions, ensuring compliance with electromagnetic compatibility (EMC) standards.
  • Excellent transient response and load regulation ensure stable power delivery to the load.

Disadvantages

  • Limited maximum output power compared to higher-power ICs.
  • Requires careful consideration of thermal management due to its small package size.

Working Principles

UCC28722DBVT operates as a primary-side regulated flyback converter. It uses PSR to regulate the output voltage by sensing the primary-side current and adjusting the duty cycle accordingly. The IC incorporates a built-in oscillator and control circuitry to generate the necessary drive signals for the primary-side switch. By controlling the switching frequency and duty cycle, it achieves efficient power conversion from the input to the output.

Application Field Plans

UCC28722DBVT is suitable for various applications, including but not limited to: - Power adapters for consumer electronics - LED lighting drivers - Industrial power supplies - Home appliances

Alternative Models

Other alternative models that can be considered for similar applications include: - UCC28720DBVT - UCC28721DBVT - UCC28723DBVT - UCC28724DBVT

These models offer similar functionality and characteristics, providing flexibility in design choices.

In conclusion, UCC28722DBVT is a highly efficient and compact IC designed for offline flyback converters. Its primary-side regulation, frequency jittering, and other features make it an excellent choice for various power management applications. While it has some limitations in terms of maximum output power and thermal considerations, its advantages outweigh the disadvantages, making it a popular choice among designers.

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Lista 10 Vanliga frågor och svar relaterade till tillämpningen av UCC28722DBVT i tekniska lösningar

Sure! Here are 10 common questions and answers related to the application of UCC28722DBVT in technical solutions:

  1. Q: What is UCC28722DBVT? A: UCC28722DBVT is a highly integrated flyback controller IC designed for offline power supplies.

  2. Q: What are the key features of UCC28722DBVT? A: Some key features include primary-side regulation, constant voltage/constant current control, high efficiency, and low standby power consumption.

  3. Q: What is primary-side regulation (PSR)? A: Primary-side regulation refers to the control of output voltage or current directly on the primary side of the transformer, eliminating the need for an optocoupler and secondary-side feedback circuitry.

  4. Q: What types of power supplies can UCC28722DBVT be used in? A: UCC28722DBVT can be used in various applications such as USB chargers, adapters, auxiliary power supplies, and LED drivers.

  5. Q: How does UCC28722DBVT achieve high efficiency? A: UCC28722DBVT achieves high efficiency through features like valley switching, frequency foldback, and adaptive dead-time control.

  6. Q: Can UCC28722DBVT support constant voltage and constant current modes? A: Yes, UCC28722DBVT supports both constant voltage and constant current control modes, making it suitable for charging applications.

  7. Q: Does UCC28722DBVT have built-in protection features? A: Yes, UCC28722DBVT has built-in protection features such as overvoltage protection, overcurrent protection, and thermal shutdown.

  8. Q: What is the standby power consumption of UCC28722DBVT? A: UCC28722DBVT has a low standby power consumption of typically less than 30mW, making it suitable for energy-efficient designs.

  9. Q: Can UCC28722DBVT operate in a wide input voltage range? A: Yes, UCC28722DBVT can operate in a wide input voltage range, typically from 85VAC to 265VAC.

  10. Q: Are there any reference designs available for UCC28722DBVT? A: Yes, Texas Instruments provides reference designs and application notes that can help engineers implement UCC28722DBVT in their designs more easily.

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