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UC3842B

Name: UC3842B
Rating: 4.7 (12 reviews)

SOP-8 AC-DC CONTROLLERS & REGULA

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Mfr。パート #UC3842B
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仕様

Part Status	Active
Output Type	PWM
Topology	Boost, Flyback
Voltage - Supply (Vcc/Vdd)	10V ~ 30V
Frequency - Switching	Up to 500kHz
Duty Cycle (Max)	50%
Control Features	Frequency Control, Soft Start
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package	8-SOP
Base Product Number	UC3842

概要

Description

The UC3842B is a high-performance, fixed-frequency, current-mode pulse-width modulation (PWM) controller primarily used in power supply applications. It facilitates the design of efficient switching power supplies, including DC-DC converters and isolated flyback converters.
Key features include a wide input voltage range (typically from 8V to 30V), a built-in oscillator for precise frequency control (typically around 100 kHz), and a current sensing input for improved regulation and protection. The controller includes features like soft start, undervoltage lockout, and thermal shutdown to enhance reliability and efficiency.
The UC3842B operates in a current-mode control scheme, which allows for fast transient response and inherent overcurrent protection. Its compact package and integration of essential functions make it suitable for space-constrained applications. Overall, it is a popular choice for designers seeking an efficient and robust solution for power management in various electronic devices.

Features

The UC3842B is a versatile voltage mode PWM controller commonly used in power supply applications. Key features include:
1. Wide Operating Voltage Range: Input voltage range of 8V to 40V, enabling flexibility in various applications.
2. Built-in 1.0A Output Driver: Capable of directly driving a power MOSFET, facilitating efficient power conversion.
3. High Switching Frequency: Supports switching frequencies up to 100 kHz, allowing for compact designs.
4. Current Limit and Soft Start: Integrated current limiting and soft start features help prevent overcurrent conditions and inrush current.
5. Error Amplifier: Includes a high-gain error amplifier for regulation and feedback control.
6. Temperature Stability: Designed for stable operation over a wide temperature range, ensuring reliability.
7. Pin-Compatible: Compatible with other members of the UC384x family for ease of design and substitution.
These features make the UC3842B suitable for a range of applications, including DC-DC converters and off-line power supplies.

Package

The UC3842B is typically available in a 8-pin DIP (Dual In-Line Package) or a 8-pin SOIC (Small Outline Integrated Circuit) package type.

Pinout

The UC3842B is a popular integrated circuit used in power supply applications, particularly for power factor correction and as a PWM controller. It features a total of 8 pins with the following functions:
1. Pin 1 (VCC): Supply voltage input.
2. Pin 2 (GND): Ground reference.
3. Pin 3 (COMP): Compensation node for error amplifier.
4. Pin 4 (VFB): Feedback voltage input, which compares with a reference voltage to control output.
5. Pin 5 (ISENSE): Current sense input for overcurrent protection.
6. Pin 6 (RT): Timing resistor connection for setting the switching frequency.
7. Pin 7 (CT): Timing capacitor connection, works with RT to set the frequency.
8. Pin 8 (OUT): Output drive for controlling the switching device (like a MOSFET).
The UC3842B operates in continuous conduction mode and is widely used in switch-mode power supplies.

Manufacturer

The UC3842B is manufactured by Texas Instruments (TI), a leading global semiconductor company. Texas Instruments specializes in designing and manufacturing a wide range of analog and embedded processing products. Founded in 1930, the company has a strong focus on innovation and technology development, serving various industries such as automotive, industrial, communications, and consumer electronics. TI is known for its high-performance integrated circuits, including power management solutions, data converters, and microcontrollers, making it a key player in the electronics industry.

Application

The UC3842B is commonly used in various applications such as switched-mode power supplies (SMPS), DC-DC converters, and battery chargers. Its features make it suitable for designing systems requiring current mode control, as well as for driving power transistor switches in high-efficiency voltage regulation. Additionally, it is utilized in low-power applications for delivering precise output voltage and current regulation in consumer electronics and industrial systems.

Equivalent

Equivalent products to the UC3842B chip include the TL3842, UC3843, UC3844, and the LM2842. These chips are similar in functionality, primarily used for voltage regulation and power supply applications. Always verify specifications to ensure compatibility for your specific application.