UCC2804DTR/81260G4

Overview

Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - High-performance current mode PWM controller - Designed for off-line and DC-to-DC converter applications - Provides necessary features to implement a complete power supply control system - Offers protection features such as overvoltage, undervoltage, and overcurrent protection

Package: SOIC-8

Essence: The UCC2804DTR/81260G4 is an integrated circuit that serves as a high-performance current mode PWM controller. It is commonly used in power management applications to regulate and control power supplies.

Packaging/Quantity: The UCC2804DTR/81260G4 is available in a small outline integrated circuit (SOIC) package with 8 pins. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 7V to 25V
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Switching Frequency Range: 50kHz to 1MHz
• Maximum Duty Cycle: 100%
• Supply Current: 5mA (typical)
• Output Current: ±200mA

Pin Configuration

The UCC2804DTR/81260G4 has the following pin configuration:

```

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| | --| 1 2 3 |-- VCC --| 4 5 6 |-- GND --| 7 8 9 |-- COMP |___________| ```

Pin Description: - Pin 1: VCC - Positive supply voltage input - Pin 2: GND - Ground reference - Pin 3: COMP - Compensation pin for feedback control

Functional Features

1. Current Mode Control: The UCC2804DTR/81260G4 utilizes current mode control to regulate the output voltage of power supplies. This control method provides improved stability and transient response.

2. Protection Features: The IC incorporates various protection features to ensure safe operation. These include overvoltage protection, undervoltage lockout, and overcurrent protection.

3. Soft Start Function: The soft start function gradually ramps up the output voltage during startup, reducing stress on components and preventing excessive inrush current.

4. Error Amplifier: The built-in error amplifier allows precise regulation of the output voltage by comparing it with a reference voltage.

Advantages

• High-performance PWM controller suitable for a wide range of power management applications.
• Provides comprehensive protection features for enhanced system reliability.
• Compact SOIC package allows for easy integration into circuit designs.
• Current mode control offers improved stability and transient response.

Disadvantages

• Limited output current capability (±200mA).
• Requires external components for complete power supply control system implementation.
• May not be suitable for high-power applications due to its current limitations.

Working Principles

The UCC2804DTR/81260G4 operates based on the principle of current mode control. It regulates the output voltage by continuously monitoring the current flowing through the power supply and adjusting the duty cycle of the PWM signal accordingly. By maintaining a stable current flow, it ensures a consistent output voltage.

The error amplifier compares the output voltage with a reference voltage and generates an error signal. This signal is then fed into the PWM comparator, which controls the switching of the power MOSFET or transistor. The switching frequency and duty cycle are adjusted dynamically to maintain the desired output voltage.

Application Field Plans

The UCC2804DTR/81260G4 is commonly used in various power management applications, including:

1. Switching Power Supplies: It is widely employed in the design of switching power supplies for computers, telecommunication equipment, industrial machinery, and consumer electronics.

2. LED Lighting: The IC can be utilized in LED lighting systems to regulate the current and ensure stable illumination.

3. Battery Chargers: It finds application in battery chargers, both for portable devices and electric vehicles, providing efficient and controlled charging.

4. Motor Control: The UCC2804DTR/81260G4 can be integrated into motor control circuits to regulate the power supply for motors, ensuring smooth operation and protection against overvoltage or overcurrent conditions.

Alternative Models

1. UCC2804N: Similar to UCC2804DTR/81260G4 but available in a DIP-8 package.
2. UC3842: A higher-power alternative with a wider input voltage range and higher output current capability.
3. TL494: Another popular PWM controller with similar features and functionality.

These alternative models offer similar functionalities and can be considered