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UCC28720DR
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UCC28720DR

Product Overview

Category

UCC28720DR 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 widely used in various power supply systems.

Characteristics

  • High efficiency: UCC28720DR offers excellent efficiency due to its advanced control algorithms and low-power operation.
  • Compact package: The IC comes in a small form factor, making it suitable for space-constrained applications.
  • Wide input voltage range: It can operate with input voltages ranging from 85V to 265V, making it compatible with different power sources.
  • Low standby power consumption: UCC28720DR minimizes power loss during standby mode, resulting in energy savings.

Package and Quantity

UCC28720DR is available in a standard SOIC-8 package. It is typically sold in reels containing 2500 units.

Specifications

  • Input Voltage Range: 85V - 265V AC
  • Output Voltage Range: Configurable based on application requirements
  • Maximum Output Power: Dependent on external components and design considerations
  • Operating Temperature Range: -40°C to +125°C
  • Control Method: Peak current mode control
  • Protection Features: Overvoltage protection, overcurrent protection, thermal shutdown

Pin Configuration

The UCC28720DR 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 peak current mode control.
  5. GND: Ground reference for the IC.
  6. DRAIN: Switching node connection for the flyback converter.
  7. VSENSE: Voltage sense pin for feedback control.
  8. VREF: Reference voltage output for the IC.

Functional Features

  • Peak current mode control: UCC28720DR utilizes peak current mode control to regulate the output voltage accurately.
  • Soft-start function: The IC incorporates a soft-start feature to prevent excessive inrush current during startup.
  • Frequency jittering: This feature reduces electromagnetic interference (EMI) emissions, ensuring compliance with regulatory standards.
  • Cycle-by-cycle current limit: UCC28720DR provides precise current limiting to protect the system from overcurrent conditions.
  • Adaptive feedback compensation: The IC adjusts the compensation based on operating conditions, enhancing stability and transient response.

Advantages and Disadvantages

Advantages

  • High efficiency leads to energy savings.
  • Compact package enables space-efficient designs.
  • Wide input voltage range ensures compatibility with various power sources.
  • Low standby power consumption reduces overall power loss.

Disadvantages

  • Requires external components for complete power supply implementation.
  • Limited maximum output power, dependent on design considerations.

Working Principles

UCC28720DR operates as a peak current mode controller for offline flyback converters. It regulates the output voltage by controlling the peak current through the power switch. By adjusting the duty cycle of the switching waveform, the IC maintains a stable output voltage despite variations in input voltage and load conditions.

Application Field Plans

UCC28720DR finds applications in various power supply systems, including but not limited to: - AC/DC adapters - LED lighting - Industrial power supplies - Home appliances - Consumer electronics

Alternative Models

Here are some alternative models that can be considered as alternatives to UCC28720DR: - UCC28721DR - UCC28722DR - UCC28723DR - UCC28724DR

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

In conclusion, UCC28720DR is a highly efficient IC designed for offline flyback converters. Its compact package, wide input voltage range, and low standby power consumption make it suitable for various power supply applications. With its advanced control features and protection mechanisms, it ensures stable and reliable operation.

Enumere 10 preguntas y respuestas comunes relacionadas con la aplicación de UCC28720DR en soluciones técnicas

Sure! Here are 10 common questions and answers related to the application of UCC28720DR in technical solutions:

  1. Q: What is UCC28720DR? A: UCC28720DR is a highly integrated primary-side regulated (PSR) flyback controller used in offline AC-DC power supplies.

  2. Q: What are the key features of UCC28720DR? A: Some key features include high efficiency, primary-side regulation, constant voltage/constant current control, 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 is the advantage of using UCC28720DR in power supply designs? A: The main advantage is improved efficiency due to PSR, reduced component count, and simplified design, leading to cost savings and smaller form factors.

  5. Q: Can UCC28720DR be used in both constant voltage and constant current applications? A: Yes, UCC28720DR supports both constant voltage (CV) and constant current (CC) control modes, making it suitable for various applications such as LED lighting and battery charging.

  6. Q: What is the maximum output power that UCC28720DR can handle? A: UCC28720DR can handle output power up to 25W, making it suitable for a wide range of low to medium power applications.

  7. Q: Does UCC28720DR have built-in protection features? A: Yes, UCC28720DR provides comprehensive protection features including overvoltage protection (OVP), overcurrent protection (OCP), and overtemperature protection (OTP).

  8. Q: Can UCC28720DR operate in a wide input voltage range? A: Yes, UCC28720DR can operate in an input voltage range of 85VAC to 265VAC, making it suitable for worldwide AC mains applications.

  9. Q: Is UCC28720DR compatible with both isolated and non-isolated power supply topologies? A: Yes, UCC28720DR is compatible with both isolated flyback and non-isolated buck-boost power supply topologies, providing flexibility in design choices.

  10. Q: Are there any evaluation boards or reference designs available for UCC28720DR? A: Yes, Texas Instruments provides evaluation boards and reference designs that can help engineers quickly prototype and implement UCC28720DR-based power supply solutions.

Please note that the answers provided here are general and may vary depending on specific application requirements. It is always recommended to refer to the datasheet and application notes for detailed information.