UCC3921DTR - English Editing Encyclopedia Entry

Product Overview

Category

UCC3921DTR belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in electronic devices for voltage regulation and power management.

Characteristics

• UCC3921DTR is a high-performance voltage mode controller.
• It operates with a wide input voltage range, making it suitable for various applications.
• The IC offers excellent line and load regulation, ensuring stable output voltages.
• It provides protection features such as overvoltage and overcurrent protection.

Package

UCC3921DTR is available in a small outline package (SOP) with 8 pins.

Essence

The essence of UCC3921DTR lies in its ability to regulate and control voltage efficiently, ensuring reliable power management in electronic devices.

Packaging/Quantity

This IC is typically packaged in reels containing a specific quantity, usually around 2500 units per reel.

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: Adjustable from 1.23V to 37V
• Maximum Output Current: 1.5A
• Switching Frequency: Up to 500kHz
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

1. VIN: Input voltage pin
2. GND: Ground reference pin
3. FB: Feedback pin for output voltage regulation
4. COMP: Compensation pin for stability control
5. CS: Current sense pin for overcurrent protection
6. SS/TR: Soft-start/Tracking pin for controlled startup
7. VREF: Reference voltage pin
8. VOUT: Output voltage pin

Functional Features

• Voltage Mode Control: UCC3921DTR utilizes voltage mode control to regulate the output voltage accurately.
• Wide Input Voltage Range: The IC can operate with input voltages ranging from 4.5V to 40V, providing flexibility in various applications.
• Excellent Line and Load Regulation: UCC3921DTR ensures stable output voltages even under varying line and load conditions.
• Protection Features: This IC incorporates overvoltage and overcurrent protection mechanisms, safeguarding the connected devices.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile application usage.
• Excellent line and load regulation ensure stable output voltages.
• Protection features provide added safety for connected devices.

Disadvantages

• Limited maximum output current of 1.5A may not be suitable for high-power applications.
• Requires external components for proper operation, increasing overall system complexity.

Working Principles

UCC3921DTR operates based on the voltage mode control technique. It compares the feedback voltage (FB) with a reference voltage (VREF) to regulate the output voltage. By adjusting the duty cycle of the internal oscillator, the IC controls the power switch to maintain the desired output voltage. The compensation pin (COMP) is used to stabilize the control loop and prevent oscillations.

Detailed Application Field Plans

UCC3921DTR finds applications in various electronic devices that require voltage regulation and power management. Some common application fields include:

1. Power Supplies: Used in AC/DC converters, DC/DC converters, and battery chargers.
2. Industrial Control Systems: Employed in motor drives, robotics, and automation systems.
3. Automotive Electronics: Utilized in automotive power modules, LED lighting, and infotainment systems.
4. Telecommunications: Applied in telecom power supplies, base stations, and network equipment.

Detailed and Complete Alternative Models

1. LM2576-ADJ: A similar voltage mode controller with adjustable output voltage and higher maximum output current.
2. LT1084: A linear voltage regulator with adjustable output voltage and higher output current capability.
3. TPS5430: A synchronous buck converter with adjustable output voltage and integrated protection features.

These alternative models offer similar functionality to UCC3921DTR and can be considered based on specific application requirements.

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