Texas Instruments
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UC3871Q
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UC3871Q

Product Overview

Category

UC3871Q belongs to the category of integrated circuits (ICs).

Use

UC3871Q is commonly used in power management applications.

Characteristics

  • UC3871Q is a high-performance voltage mode controller.
  • It operates at a frequency of up to 500kHz.
  • The device features an adjustable soft-start function.
  • It has a wide input voltage range and can handle high currents.
  • UC3871Q offers excellent line and load regulation.

Package

UC3871Q is available in a standard 16-pin dual-in-line package (DIP).

Essence

The essence of UC3871Q lies in its ability to efficiently regulate and control voltage in power management systems.

Packaging/Quantity

UC3871Q is typically sold in reels or tubes, with each reel/tube containing a specific quantity of ICs. The exact quantity may vary depending on the manufacturer.

Specifications

  • Input Voltage Range: 4.5V to 40V
  • Output Voltage Range: 0.8V to 37V
  • Maximum Output Current: 1A
  • Switching Frequency: Up to 500kHz
  • Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

  1. VCC: Power supply input
  2. GND: Ground reference
  3. COMP: Compensation pin for loop stability
  4. FB: Feedback pin for output voltage regulation
  5. CS: Current sense input for current limiting
  6. SS: Soft-start capacitor connection
  7. RT/CT: Timing resistor/capacitor connection for frequency control
  8. SYNC: Synchronization input for external clock synchronization
  9. OSC: Oscillator timing capacitor connection
  10. OSC/SD: Oscillator timing resistor connection / Shutdown control
  11. INV: Inverting input of the error amplifier
  12. VREF: Reference voltage output
  13. EAOUT: Error amplifier output
  14. DRV: Gate driver output
  15. VCC2: Secondary power supply input
  16. OUT: Power switch output

Functional Features

  • Voltage mode control for precise regulation
  • Adjustable soft-start function for controlled startup
  • Current limiting for protection against overcurrent conditions
  • External synchronization capability for system integration
  • Error amplifier for accurate feedback control
  • Gate driver output for driving external power switches

Advantages and Disadvantages

Advantages

  • High-performance voltage regulation
  • Wide input voltage range
  • Excellent line and load regulation
  • Adjustable soft-start function for controlled startup

Disadvantages

  • Limited maximum output current (1A)
  • Requires external components for complete functionality

Working Principles

UC3871Q operates on the principle of voltage mode control. It compares the feedback voltage with a reference voltage to generate an error signal. This error signal is then amplified and used to adjust the duty cycle of the power switch, ensuring precise regulation of the output voltage.

Detailed Application Field Plans

UC3871Q finds applications in various power management systems, including: - DC-DC converters - Switching regulators - Power supplies - Battery chargers - LED drivers

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to UC3871Q are: - UC3872Q - UC3873Q - UC3874Q - UC3875Q

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

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Énumérez 10 questions et réponses courantes liées à l'application de UC3871Q dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of UC3871Q in technical solutions:

1. What is UC3871Q? UC3871Q is a high-performance synchronous rectifier controller IC that is commonly used in power supply applications.

2. What is the purpose of UC3871Q? The main purpose of UC3871Q is to control the synchronous rectification process in power supply circuits, improving efficiency and reducing power losses.

3. How does UC3871Q improve power supply efficiency? UC3871Q uses synchronous rectification to replace traditional diode rectifiers, which reduces power losses and improves overall efficiency.

4. Can UC3871Q be used in both AC-DC and DC-DC power supplies? Yes, UC3871Q can be used in both AC-DC and DC-DC power supply applications, making it versatile for various technical solutions.

5. What is the maximum input voltage that UC3871Q can handle? UC3871Q can handle input voltages up to 100V, making it suitable for a wide range of power supply designs.

6. Does UC3871Q require an external MOSFET for synchronous rectification? Yes, UC3871Q requires an external N-channel MOSFET to perform synchronous rectification.

7. Can UC3871Q operate at high switching frequencies? Yes, UC3871Q is designed to operate at high switching frequencies, typically ranging from a few hundred kilohertz to several megahertz.

8. Is UC3871Q suitable for low-power applications? UC3871Q is more commonly used in medium to high-power applications due to its features and capabilities.

9. Does UC3871Q have built-in protection features? Yes, UC3871Q has built-in protection features such as overcurrent protection, undervoltage lockout, and thermal shutdown.

10. Are there any application notes or reference designs available for UC3871Q? Yes, the manufacturer of UC3871Q provides application notes and reference designs that can help engineers in implementing the IC in their technical solutions.