UCC3817PW

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics: High-performance, versatile, and efficient
• Package: PowerSO-20
• Essence: Control and regulation of voltage in power supply applications
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 16V
• Output Voltage Range: 0.8V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• Switching Frequency: Up to 1MHz
• Duty Cycle Range: 0% to 100%
• Output Current: Up to 1A

Detailed Pin Configuration

The UCC3817PW has a total of 20 pins. The 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. SS/TR: Soft-Start/Tracking Pin
8. GND: Ground Pin
9. SYNC: Synchronization Pin
10. EN: Enable Pin
11. VCC: Supply Voltage Pin
12. NC: No Connect Pin
13. NC: No Connect Pin
14. NC: No Connect Pin
15. NC: No Connect Pin
16. NC: No Connect Pin
17. NC: No Connect Pin
18. NC: No Connect Pin
19. NC: No Connect Pin
20. NC: No Connect Pin

Functional Features

• Voltage mode control for precise regulation
• Adjustable frequency and duty cycle for flexibility
• Soft-start function for smooth startup
• Synchronization capability for multi-phase operation
• Overcurrent protection for enhanced reliability
• Under-voltage lockout for system safety

Advantages and Disadvantages

Advantages: - High-performance and efficient voltage regulation - Versatile and flexible in various power supply applications - Comprehensive protection features ensure system reliability - Synchronization capability allows for multi-phase operation

Disadvantages: - Limited output current capacity (up to 1A) - Requires external timing components for operation

Working Principles

The UCC3817PW is a voltage mode PWM controller that regulates the output voltage of a power supply. It operates by comparing the feedback voltage (FB) with a reference voltage (VREF) and adjusting the duty cycle of the output waveform accordingly. This control mechanism ensures precise voltage regulation.

The device utilizes an internal oscillator to generate a sawtooth waveform, which is compared with the feedback voltage. The resulting error signal is then processed and used to modulate the duty cycle of the output waveform. By adjusting the duty cycle, the UCC3817PW controls the average output voltage.

Detailed Application Field Plans

The UCC3817PW finds extensive application in various power supply systems, including but not limited to:

1. Switching Power Supplies: Used in AC/DC converters, DC/DC converters, and other switching power supply topologies.
2. Battery Chargers: Employed in battery charging circuits for precise voltage control and efficient charging.
3. LED Lighting: Enables dimming and constant current control in LED lighting applications.
4. Motor Drives: Utilized in motor drive circuits for controlling the speed and direction of motors.
5. Audio Amplifiers: Integrated into audio amplifier designs to regulate the power supply voltage.

Detailed and Complete Alternative Models

1. UCC3813PW: Similar functionality with reduced pin count (16 pins).
2. UCC3818PW: Enhanced output current capacity (up to 2A) with similar features.
3. UCC3819PW: Extended operating temperature range (-40°C to 125°C) for harsh environments.

These alternative models provide options based on specific requirements and constraints, ensuring compatibility and flexibility in various applications.

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