UCC28521DW

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-performance synchronous rectifier controller
• Package: SOIC-8 (Small Outline Integrated Circuit)
• Essence: Efficient power conversion and control
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 28V
• Output Voltage Range: 0V to 28V
• Maximum Switching Frequency: 1MHz
• Operating Temperature Range: -40°C to 125°C
• Features: Adjustable dead-time control, adaptive shoot-through protection, programmable soft-start, cycle-by-cycle current limit, thermal shutdown protection

Detailed Pin Configuration

The UCC28521DW IC has the following pin configuration:

1. VDD: Power supply input
2. GND: Ground reference
3. FB: Feedback voltage input
4. COMP: Compensation node for error amplifier
5. CS: Current sense input
6. RT/CT: Timing resistor/capacitor connection
7. SD: Shutdown control input
8. OUT: Output voltage

Functional Features

• Adjustable Dead-Time Control: Allows precise control over the timing between high-side and low-side MOSFETs to prevent shoot-through current.
• Adaptive Shoot-Through Protection: Detects and prevents shoot-through current during switching transitions.
• Programmable Soft-Start: Enables gradual ramp-up of the output voltage during startup to minimize inrush current.
• Cycle-by-Cycle Current Limit: Protects the circuit by limiting the maximum current through the power switches.
• Thermal Shutdown Protection: Automatically shuts down the IC when the temperature exceeds a safe threshold.

Advantages and Disadvantages

Advantages: - High-performance synchronous rectifier controller - Wide input and output voltage range - Adjustable dead-time control for precise timing - Adaptive shoot-through protection for enhanced safety - Programmable soft-start for controlled startup - Cycle-by-cycle current limit for circuit protection - Thermal shutdown protection for overtemperature conditions

Disadvantages: - Limited to SOIC-8 package, which may not be suitable for all applications - Requires external components for complete power management solution

Working Principles

The UCC28521DW is a high-performance synchronous rectifier controller IC used in power management applications. It operates by controlling the timing and switching of high-side and low-side MOSFETs to efficiently convert and regulate power. The adjustable dead-time control ensures that there is no overlap between the high-side and low-side switches, preventing shoot-through current. The adaptive shoot-through protection further enhances safety by detecting and preventing any potential shoot-through current during switching transitions. The IC also features programmable soft-start, cycle-by-cycle current limit, and thermal shutdown protection to provide comprehensive power management capabilities.

Detailed Application Field Plans

The UCC28521DW can be used in various power management applications, including:

1. DC-DC Converters: The IC can be employed in buck, boost, or buck-boost converters to efficiently step down or step up the input voltage to the desired output voltage.
2. Power Supplies: It can be utilized in AC-DC power supplies to regulate the output voltage and ensure stable power delivery.
3. LED Lighting: The IC can be integrated into LED drivers to control the current and voltage supplied to the LEDs, ensuring optimal performance and efficiency.
4. Battery Charging: It can be used in battery charging circuits to regulate the charging voltage and current, protecting the battery from overcharging or damage.

Detailed and Complete Alternative Models

Some alternative models to the UCC28521DW include:

1. UCC28528D: Similar functionality with additional features such as adjustable frequency and synchronization capability.
2. UCC28517D: Lower input voltage range but offers higher switching frequency and integrated bootstrap diode.
3. UCC28510DW: Lower output voltage range but provides higher maximum switching frequency and integrated gate drivers.

These alternative models offer different specifications and features, allowing designers to choose the most suitable option for their specific application requirements.

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