UCC28221PWR

Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode controller - Designed for offline flyback converters - Provides precise regulation of output voltage and current - Offers protection features such as overvoltage, undervoltage, and overcurrent protection

Package: TSSOP (Thin Shrink Small Outline Package)

Essence: The UCC28221PWR is an integrated circuit that serves as a voltage mode PWM controller. It is primarily used in offline flyback converters to regulate the output voltage and current with high precision.

Packaging/Quantity: The UCC28221PWR is available in a TSSOP package. It is typically sold in reels or tubes containing multiple units.

Specifications

The UCC28221PWR has the following specifications:

• Input Voltage Range: 8V to 20V
• Output Voltage Range: 0V to 30V
• Maximum Duty Cycle: 100%
• Operating Temperature Range: -40°C to 125°C
• Switching Frequency Range: 50kHz to 1MHz
• Maximum Output Current: 2A

Pin Configuration

The UCC28221PWR has a total of 16 pins. The pin configuration is as follows:

1. COMP
2. FB
3. CS
4. SS/TR
5. RT/CT
6. VREF
7. GND
8. VDD
9. SYNC
10. DRAIN
11. SOURCE
12. NC
13. NC
14. NC
15. NC
16. NC

Functional Features

The UCC28221PWR offers the following functional features:

1. Voltage Mode Control: Provides precise regulation of output voltage and current in flyback converters.
2. Protection Features: Includes overvoltage, undervoltage, and overcurrent protection to ensure the safety and reliability of the system.
3. Wide Input Voltage Range: Supports input voltages ranging from 8V to 20V, making it suitable for various applications.
4. High Switching Frequency: Allows for efficient power conversion and reduces the size of external components.

Advantages and Disadvantages

Advantages: - Precise regulation of output voltage and current - Protection features enhance system safety - Wide input voltage range allows for versatile applications - High switching frequency enables efficient power conversion

Disadvantages: - Limited maximum output current (2A) - Requires additional external components for a complete power supply solution

Working Principles

The UCC28221PWR operates based on the voltage mode control technique. It compares the feedback voltage (FB) with a reference voltage (VREF) to generate an error signal. This error signal is then amplified and used to control the duty cycle of the PWM signal. By adjusting the duty cycle, the controller regulates the output voltage and current.

The device also incorporates protection features such as overvoltage, undervoltage, and overcurrent protection. These features monitor the system conditions and take appropriate actions to prevent damage to the circuitry or connected devices.

Detailed Application Field Plans

The UCC28221PWR is commonly used in the following application fields:

1. Power Supplies: Offline flyback converters in various power supply applications, including consumer electronics, industrial equipment, and telecommunications.
2. LED Lighting: LED drivers for lighting applications, providing efficient and reliable power conversion for LED lighting systems.
3. Battery Chargers: Voltage mode control for battery charging circuits, ensuring accurate and safe charging of batteries in portable devices.

Alternative Models

Here are some alternative models that can be considered as alternatives to the UCC28221PWR:

1. UCC28950: Voltage mode PWM controller with integrated protection features and a wide input voltage range.
2. LM5035: High-performance voltage mode controller designed for offline flyback converters, offering precise regulation and protection features.
3. LT1249: PWM controller with current mode control and built-in protection features, suitable for offline flyback converter applications.

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

In conclusion, the UCC28221PWR is a high-performance voltage mode PWM controller primarily used in offline flyback converters. It offers precise regulation of output voltage and current, along with protection features for enhanced system safety. With its wide input voltage range and high switching frequency, it finds applications in power supplies, LED lighting, and battery chargers. Alternative models such as UCC28950, LM5035, and LT1249 can also be considered based on specific needs.