UCC3946PWTR

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics: High efficiency, precise voltage regulation, compact size
• Package: TSSOP-16
• Essence: Control and regulate voltage in electronic circuits
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 15V
• Output Voltage Range: 0.8V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• Switching Frequency: 500kHz
• Duty Cycle Range: 0% to 100%
• Output Current: Up to 1A

Detailed Pin Configuration

1. COMP: Compensation pin for loop stability
2. FB: Feedback pin for output voltage regulation
3. CS: Current sense pin for current limit protection
4. GND: Ground reference pin
5. VCC: Power supply input pin
6. RT/CT: Timing resistor/capacitor connection pin
7. SS/TR: Soft-start/Tracking pin for controlled startup and tracking functions
8. SYNC: Synchronization pin for external clock synchronization
9. EN: Enable pin for device activation
10. NC: No Connection
11. NC: No Connection
12. NC: No Connection
13. NC: No Connection
14. NC: No Connection
15. NC: No Connection
16. VIN: Input voltage pin

Functional Features

• Voltage mode control with adjustable feedback loop compensation
• Precision voltage regulation with low output voltage ripple
• Overcurrent protection with adjustable current limit threshold
• Soft-start function for controlled startup and reduced inrush current
• External clock synchronization capability for system integration
• Enable pin for device activation and power saving mode

Advantages and Disadvantages

Advantages: - High efficiency operation for energy-saving applications - Compact size and low profile package for space-constrained designs - Wide input voltage range allows flexibility in power supply selection - Precise voltage regulation ensures stable performance of downstream components

Disadvantages: - Limited output current capability may not be suitable for high-power applications - Lack of built-in protection features such as overvoltage or undervoltage protection

Working Principles

The UCC3946PWTR is a voltage mode PWM controller that regulates the output voltage of a power supply circuit. It operates by comparing the feedback voltage from the FB pin with a reference voltage to generate an error signal. This error signal is then amplified and used to control the duty cycle of the internal power switch, which in turn adjusts the output voltage. The COMP pin provides compensation to stabilize the feedback loop and ensure proper voltage regulation. The CS pin monitors the output current and triggers current limit protection if the current exceeds a set threshold.

Detailed Application Field Plans

The UCC3946PWTR is commonly used in various electronic devices and systems where precise voltage regulation is required. Some typical application fields include: 1. Power supplies for computer peripherals and consumer electronics 2. Battery chargers and adapters 3. LED lighting systems 4. Industrial automation equipment 5. Automotive electronics

Detailed and Complete Alternative Models

1. UCC3842: Voltage Mode PWM Controller, DIP-8 package
2. UC3843: Current Mode PWM Controller, SOIC-8 package
3. TL494: Pulse Width Modulation Control Circuit, SOP-16 package
4. SG3525: Voltage Mode PWM Controller, DIP-16 package
5. LT1241: High Voltage Off-Line PWM Controller, PDIP-8 package

(Note: These alternative models are provided for reference purposes and may have different specifications and pin configurations. It is recommended to consult the respective datasheets for detailed information.)

This entry provides an overview of the UCC3946PWTR, a voltage mode PWM controller used for precise voltage regulation in various electronic applications. Its specifications, pin configuration, functional features, advantages, disadvantages, working principles, application field plans, and alternative models are discussed.