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UC1825AVTD2
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UC1825AVTD2

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Mode PWM Controller
  • Characteristics:
    • High-performance PWM controller
    • Designed for power supply applications
    • Provides precise control of output voltage and current
  • Package: Surface Mount Technology (SMT)
  • Essence: Regulates the switching frequency of power converters
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Input Voltage Range: 10V to 20V
  • Output Voltage Range: 0V to 15V
  • Operating Temperature Range: -40°C to 85°C
  • Maximum Duty Cycle: 50%
  • Switching Frequency: 100kHz to 1MHz
  • Output Current: Up to 1A
  • Supply Current: 6mA

Detailed Pin Configuration

The UC1825AVTD2 has a total of 16 pins. The pin configuration is as follows:

  1. VREF: Reference Voltage Input
  2. COMP: Error Amplifier Output
  3. FB: Feedback Input
  4. RT/CT: Timing Components Connection
  5. CT: Timing Capacitor Connection
  6. RT: Timing Resistor Connection
  7. GND: Ground
  8. OSC: Oscillator Timing Capacitor Connection
  9. SYNC: Synchronization Input
  10. SS/TR: Soft Start/Shutdown Control
  11. VCC: Power Supply Input
  12. DRVH: High-Side Gate Drive Output
  13. DRVL: Low-Side Gate Drive Output
  14. OUT: Output
  15. NC: No Connection
  16. NC: No Connection

Functional Features

  • Precise voltage regulation
  • Adjustable switching frequency
  • Soft start and shutdown control
  • Synchronization capability
  • Error amplifier for feedback control
  • High-side and low-side gate drive outputs

Advantages and Disadvantages

Advantages: - High-performance PWM controller - Provides precise control of output voltage and current - Wide input voltage range - Adjustable switching frequency - Synchronization capability for multi-phase operation

Disadvantages: - Limited maximum duty cycle (50%) - Requires external timing components - Not suitable for high-power applications

Working Principles

The UC1825AVTD2 is a voltage mode PWM controller that regulates the switching frequency of power converters. It operates by comparing the feedback voltage with a reference voltage to generate an error signal. This error signal is then amplified and used to control the duty cycle of the output waveform. By adjusting the duty cycle, the controller maintains the desired output voltage and current.

Detailed Application Field Plans

The UC1825AVTD2 is commonly used in various power supply applications, including:

  1. Switching Power Supplies
  2. DC-DC Converters
  3. Battery Chargers
  4. LED Drivers
  5. Motor Control Circuits

Detailed and Complete Alternative Models

  1. UC3825A: Similar functionality, higher output current capability
  2. UC1845: Lower cost, lower performance version
  3. TL494: General-purpose PWM controller with similar features
  4. SG3525: PWM controller with additional protection features

Note: The above alternative models are provided as examples and may not be an exhaustive list.

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10 domande e risposte comuni relative all'applicazione di UC1825AVTD2 nelle soluzioni tecniche

Sure! Here are 10 common questions and answers related to the application of UC1825AVTD2 in technical solutions:

  1. Q: What is UC1825AVTD2? A: UC1825AVTD2 is a high-performance current-mode PWM controller used in power supply applications.

  2. Q: What are the key features of UC1825AVTD2? A: Some key features include adjustable frequency, soft-start capability, cycle-by-cycle current limiting, and built-in protection circuits.

  3. Q: What is the operating voltage range of UC1825AVTD2? A: The operating voltage range is typically between 8V and 35V.

  4. Q: Can UC1825AVTD2 be used in both buck and boost converter topologies? A: Yes, UC1825AVTD2 can be used in both buck and boost converter topologies, as well as other power supply configurations.

  5. Q: How does UC1825AVTD2 achieve current-mode control? A: UC1825AVTD2 uses an internal error amplifier and a current sense resistor to regulate the output current.

  6. Q: What is the maximum switching frequency supported by UC1825AVTD2? A: The maximum switching frequency is typically around 500 kHz.

  7. Q: Does UC1825AVTD2 have any protection features? A: Yes, UC1825AVTD2 has built-in protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.

  8. Q: Can UC1825AVTD2 operate in a synchronized mode? A: Yes, UC1825AVTD2 can be synchronized to an external clock signal for applications that require synchronization.

  9. Q: What is the recommended application circuit for UC1825AVTD2? A: The datasheet of UC1825AVTD2 provides a recommended application circuit that includes the necessary external components for proper operation.

  10. Q: Are there any design considerations when using UC1825AVTD2 in high-power applications? A: Yes, in high-power applications, it is important to consider thermal management, component selection, and layout techniques to ensure reliable operation.

Please note that these answers are general and may vary depending on specific application requirements. It is always recommended to refer to the datasheet and consult with the manufacturer for detailed information.