UCC3817DWTRG4

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: SOIC-16

Essence: UCC3817DWTRG4 is a voltage mode PWM controller that is widely used in switch-mode power supplies to regulate the output voltage with high precision. It offers various protection features and is packaged in a SOIC-16 package.

Packaging/Quantity: UCC3817DWTRG4 is available in tape and reel packaging, with 2500 units per reel.

Specifications

• Input Voltage Range: 8V to 18V
• Output Voltage Range: 0V to 5V
• Operating Temperature Range: -40°C to 85°C
• Switching Frequency: 100kHz to 1MHz
• Maximum Duty Cycle: 90%
• Quiescent Current: 10mA

Pin Configuration

UCC3817DWTRG4 has a total of 16 pins arranged as follows:

___________ | | NC |1 16| VCC NC |2 15| COMP NC |3 14| FB NC |4 13| CS NC |5 12| GND NC |6 11| RT/CT NC |7 10| SS/TR NC |8 9| SYNC |___________|

Functional Features

1. Voltage Mode Control: UCC3817DWTRG4 utilizes voltage mode control to regulate the output voltage of switch-mode power supplies accurately.

2. Protection Features: The IC incorporates overvoltage and undervoltage lockout protection, soft start functionality, and current limiting to ensure safe and reliable operation.

3. Wide Input Voltage Range: With an input voltage range of 8V to 18V, the controller can be used in various applications with different input voltage levels.

4. High Switching Frequency: The device supports a wide switching frequency range from 100kHz to 1MHz, allowing for efficient power conversion.

Advantages

• Precise regulation of output voltage
• Comprehensive protection features enhance system reliability
• Wide input voltage range accommodates diverse applications
• High switching frequency enables efficient power conversion

Disadvantages

• Limited maximum duty cycle of 90%
• Requires external components for proper operation

Working Principles

UCC3817DWTRG4 operates based on the voltage mode control technique. It compares the feedback voltage (FB) with a reference voltage to generate an error signal. This error signal is then amplified and used to control the duty cycle of the PWM signal, which drives the power switches in the switch-mode power supply. By adjusting the duty cycle, the controller regulates the output voltage to match the desired value.

Application Field Plans

UCC3817DWTRG4 finds extensive application in various switch-mode power supply designs, including:

1. DC-DC Converters: The controller can be used in buck, boost, or buck-boost converters to efficiently step down or step up the input voltage.

2. LED Drivers: UCC3817DWTRG4 can be employed in LED driver circuits to provide precise current regulation and dimming control.

3. Battery Chargers: The IC can be utilized in battery charger circuits to regulate the charging voltage and current accurately.

4. Power Adapters: UCC3817DWTRG4 is suitable for power adapter designs, ensuring stable and regulated output voltage for electronic devices.

Alternative Models

1. UCC3817D: Similar to UCC3817DWTRG4 but available in a different package (PDIP-16).
2. UCC3817ADR: Another variant of UCC3817DWTRG4 with a different package (SOIC-8).
3. UCC3817AN: Pin-compatible alternative with minor differences in electrical specifications.

These alternative models provide similar functionality and can be used as substitutes for UCC3817DWTRG4 depending on specific requirements.

In conclusion, UCC3817DWTRG4 is a high-performance voltage mode PWM controller designed for switch-mode power supplies. It offers precise regulation, protection features, and wide application possibilities.