UCC38083D - English Editing Encyclopedia Entry

Product Overview

Category

UCC38083D belongs to the category of integrated circuits (ICs) specifically designed for power management applications.

Use

This IC is commonly used in various power supply systems, including switch-mode power supplies (SMPS), battery chargers, and LED drivers.

Characteristics

• UCC38083D is a high-performance current mode PWM controller.
• It operates with a wide input voltage range, making it suitable for different power supply designs.
• The IC offers excellent line and load regulation, ensuring stable output voltages.
• It provides protection features such as overvoltage, undervoltage, and overcurrent protection.
• UCC38083D has a low startup current requirement, enabling efficient power management.

Package and Quantity

The UCC38083D IC is available in a small outline package (SOP) with 8 pins. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 9V to 20V
• Output Voltage Range: Adjustable, depending on the application
• Maximum Switching Frequency: 500 kHz
• Operating Temperature Range: -40°C to 125°C
• Supply Current: Typically 2 mA

Pin Configuration

The UCC38083D IC has the following pin configuration:

1. VREF: Reference voltage input pin.
2. COMP: Compensation pin for loop stability.
3. CS: Current sense input pin for current mode control.
4. RT/CT: Timing resistor/capacitor connection pin.
5. GND: Ground reference pin.
6. FB: Feedback pin for voltage regulation.
7. VCC: Power supply input pin.
8. OUT: Output pin for driving external power devices.

Functional Features

1. Current Mode Control: UCC38083D utilizes current mode control, which provides better stability and transient response compared to voltage mode control.
2. Adjustable Output Voltage: The IC allows for adjustable output voltage, making it versatile for different power supply requirements.
3. Protection Mechanisms: UCC38083D incorporates various protection features like overvoltage, undervoltage, and overcurrent protection, ensuring the safety of the power supply system.
4. Efficient Power Management: With its low startup current requirement, UCC38083D enables efficient power management by minimizing power losses during startup.

Advantages and Disadvantages

Advantages

• Excellent line and load regulation for stable output voltages.
• Wide input voltage range for versatile applications.
• Compact SOP package for space-constrained designs.
• Protection features enhance the reliability of the power supply system.
• Low startup current requirement improves overall power efficiency.

Disadvantages

• Limited maximum switching frequency compared to some other ICs in the same category.
• Requires external components for proper operation, increasing the complexity of the circuit design.

Working Principles

UCC38083D operates based on the current mode control principle. It compares the sensed current through the power devices with a reference signal to regulate the output voltage. By adjusting the duty cycle of the PWM signal, the IC maintains the desired output voltage despite variations in input voltage and load conditions. The feedback loop ensures stability and accurate voltage regulation.

Application Field Plans

UCC38083D finds extensive application in various power supply systems, including: 1. Switch-mode power supplies (SMPS) for computers, telecommunication equipment, and industrial machinery. 2. Battery chargers for portable electronic devices, electric vehicles, and renewable energy systems. 3. LED drivers for lighting applications, such as streetlights, automotive lighting, and display panels.

Alternative Models

For similar power management applications, alternative models to UCC38083D include: 1. UC3843: A widely used PWM controller with similar features and pin configuration. 2. TL494: Another popular PWM controller offering additional features like soft-start and shutdown functions. 3. SG3525: A versatile PWM controller suitable for high-power applications.

These alternative models provide comparable functionality and can be considered as substitutes based on specific application requirements.

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