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UC3842AD8TR

Name: UC3842AD8TR
Rating: 4.7 (12 reviews)

IC REG CTRLR PWM CM 8SOIC

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規格

Series	UCx84xA
Part Status	Active
Applications	PWM Controller
Voltage - Input	-0.3V ~ 6.3V
Voltage - Supply	10V ~ 30V
Current - Supply	11 mA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package	8-SOIC
Base Product Number	UC3842

概述

Description

The UC3842AD8TR is a voltage mode PWM (Pulse Width Modulation) controller designed for use in DC-DC converter applications, particularly in off-line and isolated power supplies. It operates with a wide input voltage range and features a fixed frequency operation, typically around 100 kHz. This IC integrates essential functions such as an oscillator, a voltage reference, and a current limit circuit, making it ideal for power management in various electronic devices.
Key features include a high-speed comparator, programmable dead time, and the ability to drive external MOSFETs directly. The UC3842AD8TR is known for its efficiency and reliability, contributing to lower power consumption and thermal management in power supply designs. Its package type, D8, indicates a compact surface-mount design suitable for modern PCB layouts.
Overall, the UC3842AD8TR is widely used in applications ranging from telecom to industrial power supplies, where efficient voltage regulation and power conversion are critical.

Features

The UC3842AD8TR is a high-performance current mode PWM controller designed for switch-mode power supply applications. Key features include:
1. Voltage Range: Operates with a wide input voltage range (typically 8 to 40 V).
2. Oscillator: Integrated oscillator with adjustable frequency (typically 100 kHz to 500 kHz).
3. Current Mode Control: Provides improved transient response and simplified compensation.
4. Duty Cycle Control: Maximum duty cycle is typically 50% for optimized performance.
5. Built-in Protection: Features include undervoltage lockout (UVLO), overcurrent protection, and soft start to prevent output overshoot.
6. Output Stage: Capable of driving external power MOSFETs with totem pole output configuration.
7. Thermal Protection: Enhanced thermal performance and stability.
8. Package: Available in an 8-pin DIP or SOIC package for easy integration.
The UC3842AD8TR is widely used in power converters, battery chargers, and other applications requiring efficient power management.

Package

The UC3842AD8TR is typically packaged in an 8-pin SOIC (Small Outline Integrated Circuit) package. This surface-mount package is designed for efficient use of space on a circuit board.

Pinout

The UC3842AD8TR is a voltage-mode PWM (Pulse Width Modulation) controller commonly used in power supply applications. It comes in an 8-pin DIP (Dual In-line Package) configuration.
Pin Count and Functions:
1. Pin 1 (GND): Ground reference.
2. Pin 2 (VFB): Inverting input of the error amplifier.
3. Pin 3 (COMP): Compensation network connection for stability.
4. Pin 4 (VCC): Supply voltage input, typically 8 to 30V.
5. Pin 5 (ISENSE): Current sense input for current limiting.
6. Pin 6 (CT): Timing capacitor connection for oscillator frequency.
7. Pin 7 (DISCH): Discharge connection for timing capacitor.
8. Pin 8 (SW): Output drive for switching transistor.
This IC is widely used for applications like flyback converters and other switching power supplies due to its ease of use and integrated features.

Manufacturer

The UC3842AD8TR is manufactured by Texas Instruments (TI), a leading global semiconductor company. Texas Instruments designs and produces a wide range of semiconductor and integrated circuit products, including analog and digital signal processing devices, microcontrollers, and embedded processors. The company serves various industries, including automotive, industrial, communications, and consumer electronics. TI is known for its innovation, emphasis on research and development, and commitment to providing high-performance electronic solutions.

Application

The UC3842AD8TR is a PWM controller used primarily in switch-mode power supplies (SMPS). Its application areas include DC-DC converters, battery chargers, and low to medium power applications requiring efficient voltage regulation. It is commonly employed in computer power supplies, LED drivers, and industrial power systems, enabling efficient energy conversion and regulation in various electronic devices.

Equivalent

The UC3842AD8TR is a PWM controller commonly used in power supply applications. Equivalent products include the TL3842, SG3525, and LM3478. These alternatives may vary slightly in features and specifications, so it's important to review the datasheets to ensure compatibility with your specific application requirements.