UCC28517DWR - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - High-performance synchronous rectifier controller - Designed for use in offline flyback converters - Provides high efficiency and low standby power consumption

Package: SOIC-16

Essence: The UCC28517DWR is a power management IC that serves as a synchronous rectifier controller. It is primarily used in offline flyback converters to improve efficiency and reduce standby power consumption.

Packaging/Quantity: The UCC28517DWR is available in a SOIC-16 package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 4.5V to 30V
• Output Voltage Range: 0V to 30V
• Maximum Switching Frequency: 1MHz
• Operating Temperature Range: -40°C to 125°C
• Quiescent Current: 100µA (typical)
• Gate Drive Voltage: 9V (typical)

Pin Configuration

The UCC28517DWR has the following pin configuration:

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| | --| VDD GND |-- Pin 1: Ground (GND) --| FB COMP |-- Pin 2: Compensation Node (COMP) --| CS SS |-- Pin 3: Current Sense Input (CS) --| DRVH DRVL |-- Pins 4 and 5: Synchronous Rectifier Drive Outputs (DRVH, DRVL) --| VREF REF |-- Pin 6: Reference Voltage Output (REF) --| EN RT |-- Pin 7: Enable Input (EN) and Soft-Start Timing Capacitor (RT) --| UVLO VDD |-- Pin 8: Undervoltage Lockout Input (UVLO) --| NC |-- Pin 9: No Connection (NC) --| NC |-- Pin 10: No Connection (NC) --| NC |-- Pin 11: No Connection (NC) --| NC |-- Pin 12: No Connection (NC) --| NC |-- Pin 13: No Connection (NC) --| NC |-- Pin 14: No Connection (NC) --| NC |-- Pin 15: No Connection (NC) --| NC |-- Pin 16: No Connection (NC) |___________| ```

Functional Features

• Synchronous rectifier control for improved efficiency
• Adaptive dead-time control to minimize power losses
• Programmable soft-start function for controlled startup
• Overvoltage protection and undervoltage lockout for system safety
• Current sense input for accurate current monitoring
• Reference voltage output for external circuitry

Advantages and Disadvantages

Advantages: - High efficiency due to synchronous rectification - Low standby power consumption - Adaptive dead-time control reduces power losses - Wide input voltage range allows for versatile applications

Disadvantages: - Limited maximum switching frequency of 1MHz - Requires external compensation components for stability

Working Principles

The UCC28517DWR operates as a synchronous rectifier controller in offline flyback converters. It controls the operation of the synchronous rectifier MOSFETs, which replace traditional diodes to improve efficiency. The IC utilizes adaptive dead-time control to minimize power losses during switching transitions. It also incorporates overvoltage protection and undervoltage lockout features to ensure safe operation.

Detailed Application Field Plans

The UCC28517DWR is commonly used in various power management applications, including: - AC/DC power supplies - LED lighting systems - Battery chargers - Industrial equipment - Telecom infrastructure

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to the UCC28517DWR are: - UCC24610: Synchronous rectifier controller with integrated driver - UCC28950: High-performance synchronous rectifier controller with advanced features - UCC28600: Primary-side regulated flyback controller with synchronous rectification

These alternative models offer similar functionality and can be suitable replacements depending on specific application requirements.

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