UCC2802D

Product Overview

Category

UCC2802D belongs to the category of integrated circuits (ICs) specifically designed for power management applications.

Use

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

Characteristics

• UCC2802D is a high-performance voltage mode pulse width modulation (PWM) controller.
• It operates with a wide input voltage range, making it suitable for different power supply designs.
• The IC offers precise control over the output voltage and current, ensuring stable and efficient power delivery.
• It incorporates various protection features such as overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown.

Package and Quantity

UCC2802D is available in a standard 8-pin SOIC (Small Outline Integrated Circuit) package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 10V to 30V
• Output Voltage Range: 0V to 5V
• Operating Temperature Range: -40°C to 85°C
• Maximum Switching Frequency: 500kHz
• Supply Current: 3mA (typical)

Pin Configuration

The UCC2802D IC has the following pin configuration:

1. VREF: Reference voltage input
2. COMP: Error amplifier output
3. FB: Feedback voltage input
4. CS: Current sense input
5. GND: Ground reference
6. RT/CT: Timing resistor/capacitor connection
7. OUT: PWM output
8. VCC: Power supply voltage input

Functional Features

1. Voltage Mode Control: UCC2802D utilizes voltage mode control to regulate the output voltage by adjusting the duty cycle of the PWM signal.
2. Error Amplifier: The built-in error amplifier compares the feedback voltage with the reference voltage to generate an error signal, which is used to adjust the duty cycle and maintain output regulation.
3. Current Sensing: The IC incorporates a current sense input that allows precise monitoring of the load current, enabling accurate control and protection against overcurrent conditions.
4. Soft Start: UCC2802D includes a soft start feature that gradually ramps up the output voltage during startup, reducing stress on components and preventing excessive inrush current.
5. Protection Mechanisms: The IC offers various protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown, ensuring safe operation and preventing damage to the power supply system.

Advantages and Disadvantages

Advantages

• Wide input voltage range enables versatile application possibilities.
• Precise control over output voltage and current ensures stable and efficient power delivery.
• Incorporation of protection features enhances system reliability and safety.
• Soft start feature reduces stress on components during startup.

Disadvantages

• Limited maximum switching frequency may not be suitable for high-frequency applications.
• Availability in only one package option may limit flexibility in certain designs.

Working Principles

UCC2802D operates based on the voltage mode control technique. It compares the feedback voltage from the output with the reference voltage and generates an error signal. This error signal is then amplified and used to adjust the duty cycle of the PWM signal. By modulating the duty cycle, the IC regulates the output voltage and maintains it at the desired level.

The current sense input allows the IC to monitor the load current accurately. If an overcurrent condition is detected, the IC can take appropriate actions to protect the system, such as reducing the duty cycle or shutting down the power supply.

Application Field Plans

UCC2802D finds extensive use in various power supply applications, including: - Switch-mode power supplies (SMPS) for computers, televisions, and industrial equipment. - Battery chargers for electric vehicles, mobile devices, and renewable energy systems. - LED drivers for lighting applications.

Alternative Models

For those seeking alternative options, the following ICs can be considered: - UCC2803D: Similar to UCC2802D but with additional features such as synchronization capability. - UC3842: A popular PWM controller with a higher maximum switching frequency. - TL494: Another widely used PWM controller suitable for various power supply designs.

These alternative models offer similar functionality and can be used as substitutes depending on specific requirements.

In conclusion, UCC2802D is a versatile voltage mode PWM controller designed for power management applications. Its precise control, protection features, and wide input voltage range make it suitable for various power supply designs. However, its limited switching frequency and package options should be considered when selecting alternatives.