UCC2817ANG4

Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode pulse width modulation (PWM) controller - Designed for use in switch-mode power supplies - Provides precise control of the output voltage and current

Package: DIP-16 (Dual In-Line Package with 16 pins)

Essence: UCC2817ANG4 is a voltage mode PWM controller that plays a crucial role in regulating the output voltage and current in switch-mode power supplies.

Packaging/Quantity: The UCC2817ANG4 is typically sold in reels or tubes, with each reel/tube containing a specific quantity of ICs. The exact packaging and quantity may vary depending on the supplier.

Specifications

The UCC2817ANG4 has the following specifications:

• Input Voltage Range: 8V to 35V
• Output Voltage Range: 0V to 5V
• Operating Temperature Range: -40°C to 85°C
• Maximum Duty Cycle: 100%
• Frequency Range: 50kHz to 1MHz
• Output Current: Up to 500mA

Pin Configuration

The UCC2817ANG4 has a total of 16 pins. The detailed pin configuration is as follows:

1. COMP: Compensation Pin
2. FB: Feedback Pin
3. VREF: Reference Voltage Pin
4. RT/CT: Timing Components Connection Pin
5. CT: Timing Capacitor Pin
6. RT: Timing Resistor Pin
7. GND: Ground Pin
8. VCC: Power Supply Pin
9. SYNC: Synchronization Pin
10. SS/TR: Soft Start/Tracking Pin
11. CS: Current Sense Pin
12. INV: Inverting Input Pin
13. EA: Error Amplifier Output Pin
14. SD: Shutdown Pin
15. OUT: Output Pin
16. NC: No Connection

Functional Features

The UCC2817ANG4 offers the following functional features:

1. Voltage Mode Control: Provides precise control of 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 regulate the output.
3. Soft Start/Tracking: Allows gradual startup and tracking of the output voltage, reducing stress on the power supply components.
4. Synchronization: Enables synchronization with an external clock signal for applications requiring multiple power supplies.
5. Current Sensing: Monitors the current flowing through the power supply to protect against overcurrent conditions.

Advantages and Disadvantages

Advantages: - High-performance controller for switch-mode power supplies - Precise voltage regulation - Wide input voltage range - Flexible frequency selection - Built-in protection features

Disadvantages: - Limited output current capacity (up to 500mA) - Requires additional external components for complete power supply implementation - Relatively high cost compared to simpler PWM controllers

Working Principles

The UCC2817ANG4 operates based on the voltage mode control technique. It compares the feedback voltage from the output with a reference voltage and adjusts the duty cycle of the PWM signal accordingly. By modulating the duty cycle, it regulates the output voltage and current of the power supply.

The error amplifier amplifies the difference between the feedback voltage and the reference voltage, generating an error signal. This error signal is then fed into the PWM comparator, which compares it with a sawtooth waveform generated by the internal oscillator. The result is a pulse width modulated signal that controls the switching of the power supply.

Detailed Application Field Plans

The UCC2817ANG4 finds extensive application in various switch-mode power supply designs, including:

1. AC-DC Power Supplies: Used in desktop computers, televisions, and other electronic devices that require efficient conversion of AC power to DC power.
2. DC-DC Converters: Employed in battery-powered devices, automotive electronics, and renewable energy systems for voltage step-up or step-down conversions.
3. LED Lighting: Enables precise control of the LED driver circuitry, ensuring stable and efficient operation of LED lighting systems.
4. Industrial Power Supplies: Utilized in industrial equipment and machinery to provide reliable and regulated power for critical operations.

Detailed and Complete Alternative Models

1. UCC2817A: Similar to UCC2817ANG4 but with a different package (SOIC-16).
2. UCC3817A: Enhanced version with additional features such as adjustable soft start and overvoltage protection.
3. UC3847: Voltage mode PWM controller with higher output current capability (up to 1A) and extended temperature range.

These alternative models offer similar functionality to the UCC2817ANG4 and can be considered based on specific application requirements.

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