UCC3818ANG4

Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode controller - Designed for use in switch-mode power supplies - Provides precise control of output voltage and current - Offers protection features such as overvoltage and overcurrent protection - Suitable for various applications including industrial, automotive, and consumer electronics

Package: PDIP-16 (Plastic Dual In-Line Package)

Essence: UCC3818ANG4 is a voltage mode PWM controller that enables efficient regulation of output voltage and current in switch-mode power supplies.

Packaging/Quantity: The UCC3818ANG4 is available in a PDIP-16 package. It is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 10V to 30V
• Output Voltage Range: 0V to 5V
• Operating Temperature Range: -40°C to 85°C
• Maximum Duty Cycle: 100%
• Switching Frequency Range: 50kHz to 1MHz
• Output Current: Up to 1A

Pin Configuration

The UCC3818ANG4 has the following pin configuration:

```

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| | --| VREF | --| COMP | --| FB | --| CS | --| GND | --| RT/CT | --| SYNC | --| SS/TR | --| UVLO | --| VDD | --| OUT | --| NC | --| NC | --| NC | --| NC | |___________| ```

Functional Features

1. Voltage Mode Control: Enables precise regulation of output voltage by comparing it with a reference voltage.
2. Current Limiting: Provides protection against overcurrent by limiting the output current.
3. Overvoltage Protection: Safeguards the circuit from excessive voltage levels that could damage components.
4. Soft-Start/Tracking: Allows gradual startup of the power supply to prevent inrush current and voltage spikes.
5. Under Voltage Lockout (UVLO): Ensures proper operation by disabling the controller when the input voltage falls below a specified threshold.
6. Synchronization: Enables synchronization with an external clock signal for multi-phase operation.

Advantages

• High-performance controller for efficient power supply regulation
• Offers protection features to safeguard the circuit and connected devices
• Wide operating temperature range suitable for various environments
• Versatile application possibilities in different industries

Disadvantages

• Limited output current capacity (up to 1A)
• Requires additional external components for complete power supply implementation

Working Principles

The UCC3818ANG4 operates based on the voltage mode control technique. It compares the output voltage with a reference voltage (VREF) and adjusts the duty cycle of the PWM signal accordingly. By modulating the duty cycle, the controller regulates the output voltage and current to maintain the desired levels.

The device incorporates various protection features such as overvoltage protection, current limiting, and under voltage lockout (UVLO). These features ensure the safe and reliable operation of the power supply by preventing damage due to excessive voltage or current.

Additionally, the UCC3818ANG4 offers soft-start functionality, which gradually ramps up the output voltage during startup to avoid sudden voltage spikes and inrush current. The synchronization capability allows multiple controllers to operate in sync, enabling multi-phase power supply designs.

Application Field Plans

The UCC3818ANG4 is widely used in switch-mode power supplies across various industries. Some specific application areas include:

1. Industrial Power Supplies: Used in industrial equipment and machinery to provide stable power for control systems, motor drives, and other components.
2. Automotive Electronics: Employed in automotive power supply modules for applications such as LED lighting, infotainment systems, and engine control units.
3. Consumer Electronics: Integrated into power supplies for consumer electronic devices like televisions, audio systems, and computer peripherals.

Alternative Models

1. UCC3818APW: Similar voltage mode PWM controller with a different package (TSSOP-16).
2. UC3842AN: Voltage mode PWM controller with higher output current capacity (up to 2A).
3. LM5035MY/NOPB: Current mode PWM controller suitable for high-power applications.

These alternative models offer similar functionality and can be considered as substitutes for the UCC3818ANG4 based on specific requirements.

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