UCC3818PWTR

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics:
  • High-performance voltage mode controller
  • Wide input voltage range
  • Adjustable frequency and duty cycle
  • Overcurrent protection
  • Under-voltage lockout
• Package: TSSOP-20
• Essence: Control and regulate power supply voltages efficiently
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 75V
• Output Voltage Range: 0.8V to 60V
• Frequency Range: 100kHz to 1MHz
• Duty Cycle Range: 0% to 100%
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The UCC3818PWTR has the following pin configuration:

1. COMP: Compensation pin for external compensation network
2. FB: Feedback pin for regulating the output voltage
3. RT/CT: Timing resistor/capacitor connection pin for frequency and duty cycle control
4. VREF: Reference voltage output pin
5. SS/TR: Soft-start/Tracking pin for controlling the startup behavior
6. GND: Ground reference pin
7. VCC: Power supply voltage input pin
8. SYNC: Synchronization input pin for external clock synchronization
9. CS: Current sense input pin for overcurrent protection
10. INV: Inverting input pin for error amplifier
11. EAOUT: Error amplifier output pin
12. UVLO: Under-voltage lockout threshold pin
13. OVP: Over-voltage protection threshold pin
14. EN: Enable pin for turning on/off the controller
15. PGND: Power ground reference pin
16. ISENSE: Current sense input pin for overcurrent protection
17. VSENSE: Voltage sense input pin for output voltage regulation
18. SS/TR: Soft-start/Tracking pin for controlling the startup behavior
19. RT/CT: Timing resistor/capacitor connection pin for frequency and duty cycle control
20. COMP: Compensation pin for external compensation network

Functional Features

• Voltage mode control for precise regulation of power supply voltages
• Adjustable frequency and duty cycle for flexible operation
• Overcurrent protection to safeguard against excessive current flow
• Under-voltage lockout to prevent operation below a specified voltage threshold
• Soft-start function for controlled startup behavior
• Synchronization capability for external clock synchronization

Advantages and Disadvantages

Advantages: - High-performance controller for efficient power supply regulation - Wide input voltage range allows for versatile applications - Adjustable frequency and duty cycle provide flexibility in operation - Comprehensive protection features ensure system reliability

Disadvantages: - Limited output voltage range compared to some other controllers - Requires external compensation network for stability in certain applications

Working Principles

The UCC3818PWTR is a voltage mode PWM controller that regulates power supply voltages by comparing the feedback voltage with a reference voltage. It utilizes an error amplifier, a voltage reference, and a pulse-width modulator to achieve precise voltage regulation. The controller adjusts the duty cycle of the output waveform based on the error between the desired output voltage and the actual feedback voltage. This adjustment is done by controlling the timing of the switching transistor, which in turn controls the average output voltage.

Detailed Application Field Plans

The UCC3818PWTR is commonly used in various applications, including but not limited to:

1. Switching Power Supplies: Used in AC-DC and DC-DC converters for efficient power conversion.
2. LED Lighting: Enables dimming and control of LED brightness in lighting applications.
3. Motor Control: Provides control and regulation of motor speed and torque in motor drive systems.
4. Battery Charging: Facilitates efficient charging of batteries in portable devices and electric vehicles.
5. Telecom Power Systems: Used in power supplies for telecommunications equipment to ensure stable voltage output.

Detailed and Complete Alternative Models

1. UCC3817PWTR: Similar functionality with a different pin configuration (SOIC-20 package).
2. UCC3819PWTR: Enhanced version with additional features such as adjustable slope compensation (TSSOP-20 package).
3. UCC3813PWTR: Lower voltage range version suitable for low-power applications (TSSOP-20 package).
4. UCC3815PWTR: Higher voltage range version suitable for high-power applications (TSSOP-20 package).

(Note: This is not an exhaustive list, and there may be other alternative models available from different manufacturers.)

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