UCC2809PW-1

Product Overview

Category

UCC2809PW-1 belongs to the category of integrated circuits (ICs) specifically designed for power management applications.

Use

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

Characteristics

• UCC2809PW-1 is a high-performance voltage mode PWM controller.
• It operates with a wide input voltage range, making it suitable for different power supply designs.
• The device offers excellent line and load regulation, ensuring stable output voltages.
• It incorporates various protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.
• UCC2809PW-1 provides precise control over switching frequency and duty cycle, enabling efficient power conversion.

Package and Quantity

UCC2809PW-1 is available in a standard 8-pin SOIC (Small Outline Integrated Circuit) package. It is typically sold in reels containing a quantity of 250 units.

Specifications

• Input Voltage Range: 7V to 25V
• Output Voltage Range: 0V to VCC - 2V
• Operating Temperature Range: -40°C to 125°C
• Switching Frequency: Up to 1MHz
• Maximum Duty Cycle: 100%
• Quiescent Current: 3mA

Pin Configuration

The UCC2809PW-1 IC has the following pin configuration:

1. COMP: Compensation pin for loop stability.
2. FB: Feedback pin for regulating the output voltage.
3. CS: Current sense pin for current limit protection.
4. GND: Ground reference for the IC.
5. RT/CT: Timing resistor/capacitor connection for setting the oscillator frequency.
6. VREF: Reference voltage output for external components.
7. VCC: Power supply voltage input.
8. OUT: Output pin for driving external power devices.

Functional Features

1. Voltage Mode Control: UCC2809PW-1 utilizes voltage mode control to regulate the output voltage accurately.
2. Adjustable Frequency: The switching frequency can be adjusted using an external timing resistor and capacitor, allowing flexibility in design.
3. Protection Mechanisms: The IC incorporates various protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown to ensure safe operation.
4. Soft Start: UCC2809PW-1 includes a soft start function to prevent excessive inrush current during startup, enhancing system reliability.
5. Error Amplifier: The built-in error amplifier provides precise regulation by comparing the feedback voltage with the reference voltage.

Advantages and Disadvantages

Advantages

• Wide input voltage range enables versatile application possibilities.
• Excellent line and load regulation ensure stable output voltages.
• Protection features enhance system safety and reliability.
• Adjustable frequency allows optimization for different power supply designs.
• Soft start function prevents excessive inrush current, extending component lifespan.

Disadvantages

• Limited maximum duty cycle may restrict certain applications requiring higher duty cycles.
• Availability in only one package option might limit compatibility with specific board layouts.

Working Principles

UCC2809PW-1 operates based on the voltage mode control technique. It compares the feedback voltage from the output with the reference voltage and adjusts the duty cycle of the PWM signal accordingly. By modulating the duty cycle, the IC regulates the output voltage to maintain it at the desired level. The adjustable frequency feature allows designers to optimize the trade-off between efficiency and size.

Detailed Application Field Plans

UCC2809PW-1 finds extensive use in various power management applications, including: 1. Switch-mode power supplies (SMPS) for computers, telecommunication equipment, and industrial machinery. 2. Battery chargers for electric vehicles, portable electronics, and renewable energy systems. 3. LED drivers for lighting applications, both residential and commercial.

Detailed and Complete Alternative Models

1. UCC2809PW: Similar to UCC2809PW-1 but without the overvoltage protection feature.
2. UCC2809: A lower-cost version with reduced functionality and a narrower input voltage range.
3. UCC3809: A higher-performance variant with additional features such as adjustable slope compensation.

These alternative models provide options for different cost, performance, and application requirements.

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