UC3842N - Texas Instruments

Manufacturer Part Number

UC3842N

Manufacturer

onsemi

Introduction

The UC3842N is a high-performance, monolithic control circuit for use in fixed-frequency, current-mode controlled, boost, flyback, and forward power converter topologies. It features voltage error amplifier, oscillator, pulse-width modulator, and current-sense comparator. The UC3842N is designed to provide reliable, cost-effective control of switching power supplies.

Product Features and Performance

Operates over a wide input voltage range of 10V to 30V

Switching frequency up to 500kHz

Maximum duty cycle of 97%

Current-mode control for excellent line and load regulation

Voltage error amplifier with high DC gain and wide gain-bandwidth

Precision reference and oscillator

Undervoltage lockout and thermal shutdown protection

Single-ended control with current sense input

Product Advantages

Versatile power conversion topology support (boost, flyback, forward)

High switching frequency enables smaller magnetic components

Excellent regulation and stability across wide input and load ranges

Robust protection features for reliable operation

Key Reasons to Choose This Product

Proven performance and reliability in power supply designs

Cost-effective solution for high-frequency, high-efficiency power conversion

Comprehensive feature set reduces external component count

Ease of use with simple single-ended control

Quality and Safety Features

Robust thermal shutdown protection

Undervoltage lockout prevents improper operation

Thorough quality and reliability testing

Compatibility

The UC3842N is a standalone power management IC and can be used in a variety of power supply designs. It is compatible with a wide range of other electronic components and systems.

Application Areas

Boost, flyback, and forward power converters

Switch-mode power supplies

Battery chargers

Industrial control and automation systems

Telecommunications equipment

Consumer electronics

Product Lifecycle

The UC3842N is an obsolete product, meaning it is no longer in active production. However, there are several comparable and alternative models available from onsemi, including the UC3843, UC3844, and UC3845 series. Customers are advised to contact our website's sales team for more information on available options and recommended replacement parts.