UCC3801N

Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode controller - Designed for use in offline and DC-to-DC power supplies - Provides precise control of output voltage and current - Offers protection features such as overvoltage and undervoltage lockout, cycle-by-cycle current limiting, and soft start - Suitable for various applications including industrial, consumer, and automotive electronics

Package: PDIP-8 (Plastic Dual In-Line Package)

Essence: UCC3801N is a voltage mode PWM controller IC that enables efficient and reliable control of power supplies.

Packaging/Quantity: UCC3801N is typically sold in reels or tubes containing 250 units per package.

Specifications

• Supply Voltage Range: 7V to 20V
• Operating Temperature Range: -40°C to 85°C
• Maximum Duty Cycle: 100%
• Oscillator Frequency Range: 50kHz to 500kHz
• Output Current: ±1A
• Error Amplifier Gain Bandwidth Product: 2.5MHz
• Soft Start Time: Adjustable

Pin Configuration

UCC3801N features an 8-pin PDIP package with the following pin configuration:

____ VREF| |VIN FB | |COMP CS | |RT/CT GND | |OUT RT | |SYNC VCC | |UVLO ----

Functional Features

1. Voltage Mode Control: UCC3801N utilizes voltage mode control to regulate the output voltage of power supplies accurately.
2. Protection Features: The IC incorporates overvoltage and undervoltage lockout, cycle-by-cycle current limiting, and soft start to ensure safe operation and protect the system from faults.
3. Wide Operating Range: With a supply voltage range of 7V to 20V, UCC3801N can be used in various power supply applications.
4. Adjustable Soft Start: The soft start time can be adjusted to control the rate at which the output voltage ramps up during startup, preventing excessive inrush current.

Advantages

• Precise control of output voltage and current
• Protection features enhance system reliability
• Wide operating voltage range allows for versatile applications
• Adjustable soft start prevents excessive inrush current

Disadvantages

• Limited output current capability (±1A)
• Requires external components for complete power supply implementation

Working Principles

UCC3801N operates by comparing the feedback voltage (FB) with a reference voltage (VREF) to generate an error signal. This error signal is then amplified and used to control the duty cycle of the PWM signal, which regulates the output voltage. By adjusting the duty cycle, the IC maintains the desired output voltage despite variations in input voltage or load conditions.

Detailed Application Field Plans

UCC3801N finds application in various fields, including:

1. Industrial Electronics: Power supplies for industrial equipment, motor drives, and control systems.
2. Consumer Electronics: AC-DC adapters, battery chargers, LED lighting drivers, and audio amplifiers.
3. Automotive Electronics: DC-DC converters, battery management systems, and automotive lighting.

Alternative Models

Here are some alternative models that offer similar functionality to UCC3801N:

1. UC3842: Voltage mode PWM controller with higher output current capability.
2. TL494: PWM controller with additional features like adjustable dead time and shutdown function.
3. SG3525: PWM controller designed for high-frequency applications.

These alternative models can be considered based on specific requirements and application needs.

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