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UCC28500DW
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UCC28500DW

Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode controller - Designed for offline flyback converters - Provides precise regulation of output voltage and current - Offers excellent line and load regulation - Enables efficient power conversion

Package: SOIC-16

Essence: The UCC28500DW is a voltage mode PWM controller that is widely used in offline flyback converters. It provides precise regulation of output voltage and current, ensuring excellent line and load regulation. With its high-performance capabilities, this IC enables efficient power conversion.

Packaging/Quantity: The UCC28500DW is available in a standard SOIC-16 package. It is typically sold in reels or tubes containing multiple units.

Specifications

The UCC28500DW has the following specifications:

  • Input Voltage Range: 8V to 20V
  • Output Voltage Range: 0V to 15V
  • Maximum Duty Cycle: 100%
  • Operating Temperature Range: -40°C to 125°C
  • Switching Frequency: 50kHz to 1MHz
  • Output Current: Up to 2A
  • Quiescent Current: 3mA

Pin Configuration

The UCC28500DW features a 16-pin configuration with the following pin assignments:

  1. VREF: Reference Voltage Output
  2. COMP: Error Amplifier Output
  3. FB: Feedback Input
  4. CS: Current Sense Input
  5. GND: Ground
  6. RT/CT: Timing Resistor/Capacitor Connection
  7. SS/TR: Soft-Start/Tracking Input
  8. UVLO: Undervoltage Lockout Input
  9. VDD: Supply Voltage Input
  10. SYNC: Synchronization Input
  11. NC: No Connection
  12. NC: No Connection
  13. NC: No Connection
  14. NC: No Connection
  15. NC: No Connection
  16. VCC: Voltage Output

Functional Features

The UCC28500DW offers the following functional features:

  • Voltage mode control for precise regulation of output voltage and current
  • Soft-start function for controlled startup and reduced stress on components
  • Error amplifier with adjustable compensation for improved stability
  • Undervoltage lockout protection to prevent operation below specified voltage levels
  • Synchronization input for synchronization with an external clock signal
  • Current sense input for accurate current sensing and control

Advantages and Disadvantages

Advantages: - High-performance voltage mode controller - Excellent line and load regulation - Efficient power conversion - Precise regulation of output voltage and current

Disadvantages: - Limited output current capability (up to 2A) - Requires external timing resistor and capacitor for operation

Working Principles

The UCC28500DW operates based on the voltage mode control principle. It compares the feedback voltage from the output with a reference voltage and adjusts the duty cycle of the PWM signal accordingly. This control mechanism ensures precise regulation of the output voltage and current. The IC also incorporates various protection features such as undervoltage lockout to enhance system reliability.

Application Field Plans

The UCC28500DW is commonly used in the following application fields:

  1. Offline Flyback Converters: The IC is specifically designed for offline flyback converters, which are widely used in power supplies for various electronic devices. It enables efficient power conversion and provides excellent line and load regulation.

  2. LED Lighting: The UCC28500DW can be utilized in LED lighting applications where precise regulation of voltage and current is crucial. Its high-performance characteristics make it suitable for driving LED arrays and ensuring optimal illumination.

  3. Industrial Power Supplies: The voltage mode control and high-performance capabilities of the UCC28500DW make it suitable for use in industrial power supplies. It can be employed in applications such as motor drives, inverters, and uninterruptible power supplies (UPS).

Alternative Models

In addition to the UCC28500DW, there are several alternative models available that offer similar functionality. Some notable alternatives include:

  1. UCC28070: A voltage mode PWM controller with integrated MOSFET driver.
  2. UC3843: A popular voltage mode PWM controller with adjustable frequency and duty cycle.
  3. LT1241: A high-performance current mode PWM controller with wide input voltage range.

These alternative models can be considered based on specific application requirements and design constraints.

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Énumérez 10 questions et réponses courantes liées à l'application de UCC28500DW dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of UCC28500DW in technical solutions:

  1. Q: What is UCC28500DW? A: UCC28500DW is a high-performance, low-power, current-mode PWM controller used for various power supply applications.

  2. Q: What are the key features of UCC28500DW? A: Some key features include wide input voltage range, adjustable switching frequency, cycle-by-cycle current limit, and integrated soft-start.

  3. Q: What is the typical application of UCC28500DW? A: UCC28500DW is commonly used in offline flyback converters, LED drivers, battery chargers, and other power supply designs.

  4. Q: How does UCC28500DW achieve cycle-by-cycle current limit? A: UCC28500DW utilizes a current sense resistor in series with the power switch to monitor the current flowing through it and limit it on a cycle-by-cycle basis.

  5. Q: Can UCC28500DW operate at high switching frequencies? A: Yes, UCC28500DW can operate at switching frequencies up to several hundred kilohertz, making it suitable for both low and high power applications.

  6. Q: Does UCC28500DW have built-in protection features? A: Yes, UCC28500DW offers various protection features like overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown.

  7. Q: Can UCC28500DW be used in both isolated and non-isolated power supplies? A: Yes, UCC28500DW can be used in both isolated and non-isolated power supply topologies, providing flexibility in design.

  8. Q: What is the maximum output power that UCC28500DW can handle? A: The maximum output power depends on the specific application and external components used, but UCC28500DW is capable of handling power levels up to several hundred watts.

  9. Q: Is UCC28500DW suitable for high-efficiency designs? A: Yes, UCC28500DW offers excellent efficiency due to its low-power operation, adjustable switching frequency, and other optimization features.

  10. Q: Are there any reference designs available for UCC28500DW? A: Yes, Texas Instruments provides reference designs and application notes that showcase the implementation of UCC28500DW in various power supply applications.

Please note that these answers are general and may vary depending on the specific requirements and design considerations of your application.