UCC3817APWRG4

Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode controller - Designed for use in switch-mode power supplies - Provides precise regulation of output voltage - Offers protection features such as overvoltage and undervoltage lockout, soft start, and current limiting

Package: TSSOP-14

Essence: The UCC3817APWRG4 is a voltage mode PWM controller that is widely used in switch-mode power supplies. It provides accurate regulation of the output voltage and offers various protection features to ensure safe operation.

Packaging/Quantity: The UCC3817APWRG4 is available in a TSSOP-14 package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 8V to 18V
• Output Voltage Range: 0V to 5V
• Operating Temperature Range: -40°C to 85°C
• Maximum Duty Cycle: 100%
• Switching Frequency: 100kHz to 1MHz
• Quiescent Current: 2mA

Pin Configuration

The UCC3817APWRG4 has the following pin configuration:

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| | --| VREF | --| COMP | --| FB | --| CS | --| GND | --| RT/CT | --| CT/RT | --| SYNC | --| SS/TR | --| VCC | --| OUT | --| INV | --| NC | |___________| ```

Functional Features

1. Voltage Mode Control: The UCC3817APWRG4 utilizes voltage mode control to regulate the output voltage of a switch-mode power supply. This ensures stable and accurate voltage regulation.

2. Protection Features: The controller incorporates various protection features, including overvoltage and undervoltage lockout, soft start, and current limiting. These features enhance the reliability and safety of the power supply.

3. Wide Input Voltage Range: The UCC3817APWRG4 can operate with an input voltage range of 8V to 18V, making it suitable for a wide range of applications.

4. High Switching Frequency: With a switching frequency ranging from 100kHz to 1MHz, the controller enables efficient power conversion while minimizing the size of external components.

Advantages

• Precise voltage regulation
• Comprehensive protection features
• Wide input voltage range
• High switching frequency for efficient power conversion

Disadvantages

• Limited pin configuration options
• Relatively high quiescent current compared to some alternative models

Working Principles

The UCC3817APWRG4 operates on the principle of voltage mode control. 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 adjust the duty cycle of the PWM signal, which controls the power switch in the switch-mode power supply. By continuously monitoring and adjusting the duty cycle, the controller maintains a stable output voltage.

Application Field Plans

The UCC3817APWRG4 is commonly used in various applications, including:

1. Power Supplies: It is widely employed in switch-mode power supplies used in computer systems, telecommunication equipment, industrial machinery, and consumer electronics.

2. LED Lighting: The controller is suitable for driving LED lighting systems, providing efficient and reliable power conversion for LED lamps and fixtures.

3. Motor Control: It can be utilized in motor control circuits to regulate the voltage supplied to motors, ensuring smooth and precise operation.

4. Battery Charging: The UCC3817APWRG4 is also used in battery charging circuits, enabling efficient and controlled charging of batteries in portable devices and electric vehicles.

Alternative Models

1. UCC3813: This model offers similar functionality but with a lower quiescent current, making it more suitable for low-power applications.

2. UCC3818: With additional features such as adjustable soft start and programmable maximum duty cycle, this model provides enhanced flexibility in power supply design.

3. UCC3819: Designed for high-frequency applications, this model offers a higher switching frequency range and improved efficiency.

4. UCC3810: This model is optimized for offline power supplies, providing isolation between the control circuitry and high-voltage sections.

These alternative models can be considered based on specific application requirements and desired performance characteristics.

In conclusion, the UCC3817APWRG4 is a high-performance voltage mode PWM controller used in switch-mode power supplies. It offers precise voltage regulation, comprehensive protection features, and a wide input voltage range