UCC3818DWTRG4

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: 3V to 40V
• Output Voltage Range: 0.8V to 7.5V
• Operating Temperature Range: -40°C to 125°C
• Switching Frequency: Up to 1MHz
• Duty Cycle Range: 0% to 100%
• Output Current: Up to 1A
• Error Amplifier Gain Bandwidth Product: 10MHz
• Soft Start Time: Adjustable

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 resistor/capacitor connection for frequency control
5. SS/TR: Soft start/timing capacitor connection
6. GND: Ground reference
7. VREF: Reference voltage output
8. VDD: Power supply input
9. SYNC: Synchronization input for multiple ICs
10. EN/UVLO: Enable/Undervoltage lockout control
11. OSC: Oscillator timing capacitor connection
12. CT/RT: Timing capacitor/resistor connection for frequency control
13. DRVH: High-side gate driver output
14. DRVL: Low-side gate driver output
15. VSENSE: Voltage sense input for current limit protection
16. VIN: Input voltage

Functional Features

• Voltage mode control with adjustable duty cycle
• Adaptive gate drive for enhanced efficiency
• Cycle-by-cycle current limit protection
• Soft start and adjustable soft start time
• Synchronization capability for multiple ICs
• Enable and undervoltage lockout control
• Error amplifier with high gain bandwidth product

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications - High-performance design ensures efficient power regulation - Adaptive gate drive improves overall system efficiency - Cycle-by-cycle current limit protection enhances system safety - Synchronization capability enables multi-IC operation

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

Working Principles

The UCC3818DWTRG4 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) amplifies the difference between FB and VREF, providing the control signal for the duty cycle adjustment.

The IC features adaptive gate drive, which optimizes the switching characteristics of the power MOSFETs in the system, resulting in improved efficiency. It also incorporates cycle-by-cycle current limit protection, preventing excessive current flow and enhancing system safety.

The soft start function gradually ramps up the duty cycle during startup, reducing stress on the components and minimizing inrush current. The soft start time can be adjusted using an external capacitor connected to the SS/TR pin.

Detailed Application Field Plans

The UCC3818DWTRG4 is commonly used in various power supply applications, including:

1. DC-DC converters: Provides voltage regulation in step-down or step-up converter topologies.
2. AC-DC power supplies: Controls the output voltage of rectified AC power for electronic devices.
3. LED lighting: Regulates the voltage for LED drivers, ensuring stable and efficient illumination.
4. Battery chargers: Controls the charging process of batteries, maintaining optimal charging voltage.

Detailed and Complete Alternative Models

1. UCC3818DW: Similar specifications and features, but in a different package (SOIC-20).
2. UCC3818N: DIP-16 package variant with comparable performance characteristics.
3. UCC3818P: PDIP-16 package option with similar functionality and specifications.

These alternative models offer flexibility in terms of package options while providing similar performance and functionality to the UCC3818DWTRG4.

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