UCC28C45DGKR

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics:
  • High-performance controller for power supply applications
  • Designed for offline and DC-to-DC converters
  • Provides precise regulation of output voltage
• Package: VSSOP-8
• Essence: Control and regulation of power supply voltage
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 7.6V to 30V
• Output Voltage Range: 0.9V to 15V
• Operating Temperature Range: -40°C to 125°C
• Switching Frequency: 100kHz to 1MHz
• Duty Cycle Range: 0% to 100%
• Maximum Duty Cycle Limit: 90%

Detailed Pin Configuration

The UCC28C45DGKR has the following pin configuration:

1. COMP: Compensation Pin
2. FB: Feedback Pin
3. CS: Current Sense Pin
4. GND: Ground Pin
5. RT/CT: Timing Resistor/Capacitor Pin
6. VREF: Reference Voltage Pin
7. VCC: Supply Voltage Pin
8. OUT: Output Pin

Functional Features

• Voltage mode control with adjustable duty cycle
• Internal oscillator with frequency adjustment capability
• Soft-start function for controlled startup
• Overvoltage protection
• Undervoltage lockout
• Error amplifier for precise regulation
• Current sense input for current limiting

Advantages and Disadvantages

Advantages: - Precise regulation of output voltage - Wide input voltage range - Adjustable switching frequency - Comprehensive protection features - Compact package size

Disadvantages: - Limited maximum duty cycle - Requires external components for operation

Working Principles

The UCC28C45DGKR is a voltage mode PWM controller that regulates the output voltage of power supplies. It operates by comparing the feedback voltage (FB) with a reference voltage (VREF) and adjusts the duty cycle of the output waveform accordingly. The control loop continuously monitors the output voltage and adjusts the duty cycle to maintain the desired voltage level.

The device uses an internal oscillator to generate a sawtooth waveform, which is compared with the feedback voltage to determine the required duty cycle. The timing resistor (RT) and timing capacitor (CT) connected to the RT/CT pin set the switching frequency of the controller.

The UCC28C45DGKR also incorporates various protection features such as overvoltage protection and undervoltage lockout to ensure safe operation of the power supply.

Detailed Application Field Plans

The UCC28C45DGKR is commonly used in various power supply applications, including:

1. Offline Power Supplies: Used in AC-to-DC converters for appliances, industrial equipment, and consumer electronics.
2. DC-to-DC Converters: Employed in voltage step-up or step-down applications, such as battery chargers, LED drivers, and automotive power systems.
3. Switching Power Supplies: Utilized in high-efficiency power supplies for computers, servers, telecommunications equipment, and other electronic devices.

Detailed and Complete Alternative Models

1. UCC28C44DGKR: Similar functionality with minor differences in specifications.
2. UCC28C46DGKR: Enhanced version with additional features and improved performance.
3. UCC28C48DGKR: Higher voltage range and increased current handling capability.

These alternative models provide similar functionality and can be considered as substitutes based on specific requirements and application needs.

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