UCC3817DTRG4 - English Editing Encyclopedia Entry

Product Overview

Category

UCC3817DTRG4 belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in power management applications.

Characteristics

• UCC3817DTRG4 is a high-performance voltage mode PWM controller.
• It operates with a wide input voltage range and provides precise regulation for various power supply designs.
• The IC offers excellent line and load regulation, making it suitable for demanding applications.
• It features a built-in error amplifier, oscillator, and soft-start circuitry, simplifying system design.

Package

UCC3817DTRG4 is available in a small outline package (SOT-23) which allows for compact circuit designs.

Essence

The essence of UCC3817DTRG4 lies in its ability to regulate voltage efficiently and reliably in power management systems.

Packaging/Quantity

This IC is typically packaged in reels containing 3000 units per reel.

Specifications

• Input Voltage Range: 3V to 40V
• Output Voltage Range: 1.25V to 37V
• Maximum Duty Cycle: 100%
• Operating Temperature Range: -40°C to 125°C
• Switching Frequency: Adjustable up to 1MHz
• Error Amplifier Gain Bandwidth: 10MHz

Detailed Pin Configuration

UCC3817DTRG4 has the following pin configuration:

1. COMP: Compensation pin for external frequency compensation components.
2. FB: Feedback pin for regulating the output voltage.
3. RT/CT: Timing resistor/capacitor connection pins for setting the oscillator frequency.
4. GND: Ground reference pin.
5. VREF: Reference voltage output pin.
6. VCC: Power supply input pin.
7. CS: Current sense pin for monitoring the output current.
8. OUT: Output pin for connecting to the power stage.

Functional Features

• Voltage mode PWM control with adjustable frequency and duty cycle.
• Built-in error amplifier with high gain and bandwidth for precise regulation.
• Soft-start circuitry for controlled startup and reduced inrush current.
• Overcurrent protection with adjustable current limit.
• Undervoltage lockout (UVLO) for reliable operation under low input voltage conditions.
• Power-saving shutdown mode for reduced power consumption during standby.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile application scenarios.
• Excellent line and load regulation ensure stable output voltage.
• Compact SOT-23 package enables space-efficient designs.
• Adjustable switching frequency provides flexibility in system optimization.
• Integrated features simplify circuit design and reduce external component count.

Disadvantages

• Limited maximum output voltage may not be suitable for certain high-voltage applications.
• Requires external frequency compensation components for stability in some cases.
• Not suitable for applications requiring synchronous rectification or advanced control features.

Working Principles

UCC3817DTRG4 operates based on the voltage mode PWM control principle. It compares the feedback voltage from the FB pin with a reference voltage (VREF) to generate an error signal. This error signal is amplified by the internal error amplifier and used to adjust the duty cycle of the PWM signal. By modulating the duty cycle, the IC regulates the output voltage according to the desired setpoint. The soft-start circuitry ensures a controlled startup, while the overcurrent protection and UVLO features enhance system reliability.

Detailed Application Field Plans

UCC3817DTRG4 finds applications in various power management systems, including but not limited to: - DC-DC converters - AC-DC power supplies - Battery chargers - LED drivers - Industrial automation equipment - Automotive electronics

Detailed and Complete Alternative Models

Some alternative models to UCC3817DTRG4 that offer similar functionality are: - LM5035 from Texas Instruments - LT1241 from Analog Devices - MAX5069 from Maxim Integrated - NCP1200 from ON Semiconductor

These alternatives can be considered based on specific application requirements, availability, and cost considerations.

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