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UC3825BDW
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UC3825BDW

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: PWM Controller
  • Characteristics:
    • High-performance voltage mode PWM controller
    • Designed for power supply applications
    • Provides precise control of switching power supplies
  • Package: SOIC-16
  • Essence: UC3825BDW is a voltage mode PWM controller used in power supply applications.
  • Packaging/Quantity: The UC3825BDW is typically sold in reels of 250 units.

Specifications

  • Input Voltage Range: 10V to 20V
  • Output Voltage Range: 0V to 5V
  • Operating Temperature Range: -40°C to +85°C
  • Switching Frequency Range: 50kHz to 1MHz
  • Maximum Duty Cycle: 100%
  • Supply Current: 6mA

Pin Configuration

The UC3825BDW has the following pin configuration:

  1. VREF
  2. COMP
  3. CS
  4. RT/CT
  5. GND
  6. OUTPUT
  7. VCC
  8. SYNC
  9. OSC
  10. UVLO
  11. SS/TR
  12. FB
  13. INV
  14. SD
  15. NC
  16. NC

Functional Features

  • Voltage Mode Control: The UC3825BDW utilizes voltage mode control to regulate the output voltage of a power supply.
  • Current Sensing: The CS pin allows for accurate current sensing, enabling precise control of the power supply.
  • Soft Start/Shutdown: The SS/TR pin provides soft start and shutdown functionality, preventing excessive inrush current during startup.
  • Synchronization: The SYNC pin allows for synchronization with an external clock source, ensuring proper timing in multi-phase power supplies.
  • Under Voltage Lockout (UVLO): The UVLO pin protects the power supply from operating below a specified voltage threshold, preventing damage to the system.

Advantages and Disadvantages

Advantages

  • High-performance PWM controller for power supply applications
  • Precise control of switching power supplies
  • Soft start and shutdown functionality
  • Synchronization capability for multi-phase power supplies

Disadvantages

  • Limited input voltage range (10V to 20V)
  • Limited output voltage range (0V to 5V)

Working Principles

The UC3825BDW operates based on the voltage mode control principle. It compares the feedback voltage from the power supply output with a reference voltage to generate an error signal. This error signal is then amplified and used to control the duty cycle of the power supply's switching element. By adjusting the duty cycle, the UC3825BDW regulates the output voltage to the desired level.

Detailed Application Field Plans

The UC3825BDW is commonly used in various power supply applications, including:

  1. Switching Power Supplies
  2. DC-DC Converters
  3. AC-DC Converters
  4. Uninterruptible Power Supplies (UPS)
  5. LED Drivers
  6. Battery Chargers

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to the UC3825BDW are:

  1. UC3842B: Similar voltage mode PWM controller with extended input voltage range.
  2. TL494: PWM controller with additional features like adjustable dead time and frequency modulation.
  3. SG3525: PWM controller with built-in oscillator and error amplifier.

These alternative models offer similar functionality and can be suitable replacements depending on specific requirements.

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Liste 10 perguntas e respostas comuns relacionadas à aplicação de UC3825BDW em soluções técnicas

Sure! Here are 10 common questions and answers related to the application of UC3825BDW in technical solutions:

  1. Q: What is UC3825BDW? A: UC3825BDW is a pulse width modulation (PWM) controller IC commonly used in power supply applications.

  2. Q: What is the operating voltage range of UC3825BDW? A: The operating voltage range of UC3825BDW is typically between 8V and 35V.

  3. Q: Can UC3825BDW be used in both buck and boost converter designs? A: Yes, UC3825BDW can be used in both buck and boost converter designs.

  4. Q: What is the maximum switching frequency supported by UC3825BDW? A: UC3825BDW supports a maximum switching frequency of up to 1MHz.

  5. Q: Does UC3825BDW have built-in protection features? A: Yes, UC3825BDW has built-in protection features such as overcurrent protection and thermal shutdown.

  6. Q: Can UC3825BDW be used in high-power applications? A: Yes, UC3825BDW can be used in high-power applications as it can handle high currents and voltages.

  7. Q: Is UC3825BDW suitable for battery charging applications? A: Yes, UC3825BDW can be used in battery charging applications with appropriate circuit design.

  8. Q: What type of feedback control does UC3825BDW support? A: UC3825BDW supports voltage mode control, where the output voltage is regulated based on a feedback signal.

  9. Q: Can UC3825BDW be used in synchronous rectification designs? A: Yes, UC3825BDW can be used in synchronous rectification designs by incorporating external MOSFETs.

  10. Q: Are there any application notes or reference designs available for UC3825BDW? A: Yes, the manufacturer of UC3825BDW provides application notes and reference designs that can help with its implementation in various technical solutions.

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