UCC3817DWTR

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics: High-performance, low-power, wide input voltage range
• Package: SOIC-16
• Essence: Control and regulation of power supply systems
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 75V
• Output Voltage Range: 0.8V to 60V
• Operating Temperature Range: -40°C to 125°C
• Switching Frequency: Up to 1MHz
• Duty Cycle Range: 0% to 100%
• Error Amplifier Bandwidth: 10MHz

Detailed Pin Configuration

1. COMP: Compensation pin for error amplifier
2. FB: Feedback pin for output voltage regulation
3. CS: Current sense pin for current limit protection
4. RT/CT: Timing components connection pins
5. VREF: Reference voltage output pin
6. GND: Ground pin
7. SS/TR: Soft-start and tracking control pin
8. SYNC: Synchronization input pin
9. VCC: Power supply input pin
10. DRVH: High-side gate driver output pin
11. DRVL: Low-side gate driver output pin
12. BOOT: Bootstrap capacitor connection pin
13. HO: High-side MOSFET gate drive output pin
14. LO: Low-side MOSFET gate drive output pin
15. NC: No Connection
16. NC: No Connection

Functional Features

• Voltage mode control with adjustable duty cycle
• Programmable soft-start and tracking function
• Overcurrent protection with adjustable current limit
• Synchronization capability for multi-phase operation
• Error amplifier with high bandwidth for fast response
• Wide input voltage range for versatile applications

Advantages and Disadvantages

Advantages

• High-performance PWM controller for power supply systems
• Wide input voltage range allows flexibility in design
• Adjustable duty cycle and soft-start function for precise control
• Overcurrent protection enhances system reliability
• Synchronization capability enables multi-phase operation

Disadvantages

• Limited output voltage range compared to some other controllers
• Requires external timing components for operation
• Higher cost compared to basic PWM controllers

Working Principles

The UCC3817DWTR is a voltage mode PWM controller that regulates the output voltage of power supply systems. It operates by comparing the feedback voltage (FB) with a reference voltage (VREF) and adjusting the duty cycle of the output waveform accordingly. The error amplifier (COMP) compares the two voltages and generates an error signal, which is then used to control the switching of the power MOSFETs.

By adjusting the duty cycle, the controller regulates the output voltage within a specified range. The soft-start and tracking function gradually ramps up the output voltage during startup to prevent excessive inrush current. The overcurrent protection feature limits the current flowing through the power MOSFETs, protecting them from damage.

The UCC3817DWTR can be synchronized with other controllers to achieve multi-phase operation, improving overall system performance. Its high bandwidth error amplifier ensures fast response to load changes, maintaining stable output voltage.

Detailed Application Field Plans

The UCC3817DWTR is widely used in various applications including:

1. Switching Power Supplies: It is commonly employed in AC/DC and DC/DC converters, providing efficient and regulated power conversion.
2. LED Lighting: The controller is utilized in LED drivers to maintain constant current or voltage for optimal lighting performance.
3. Industrial Automation: It finds application in motor drives, robotics, and control systems, ensuring reliable and precise power delivery.
4. Telecommunications: The UCC3817DWTR is used in telecom power supplies, ensuring stable and efficient power distribution.
5. Automotive Electronics: It is employed in automotive power systems, providing regulated power for various electronic components.

Detailed and Complete Alternative Models

1. UCC3813DWTR: Similar functionality with fewer pins (SOIC-14 package)
2. UCC3818DWTR: Higher switching frequency capability (SOIC-16 package)
3. UCC3819DWTR: Enhanced features such as adjustable slope compensation (SOIC-16 package)
4. UCC3810DWTR: Lower cost alternative with basic functionality (SOIC-16 package)

These alternative models offer different features and specifications to cater to specific application requirements.

In conclusion, the UCC3817DWTR is a high-performance voltage mode PWM controller that provides precise control and regulation of power supply systems. With its wide input voltage range, adjustable duty cycle, and various protection features, it finds extensive use in diverse applications ranging from power supplies to automotive electronics.