UC3842BD1

Description

The STMicroelectronics UC3842BD1 is a high-performance current-mode PWM controller designed for power supply applications, such as offline and DC-DC converters, battery chargers, and LED drivers. Its output driver features voltage feedback for precise duty cycle control, allowing it to operate with fixed or variable frequencies based on input voltage. The IC also boasts an internal soft-start function to mitigate start-up stresses, as well as overvoltage protection and high-accuracy current sensing. Due to its versatility and reliable performance, the UC3842BD1 is suitable for a wide range of applications, including motor control, industrial controls, and solar inverters. This controller offers a dependable and efficient solution for designers seeking to design robust power supply systems with minimal component count.

Features

The UC3842BD1 features include:

• High-performance current mode PWM controller
• Output driver with voltage feedback for precise duty cycle control
• Can operate with fixed frequency or frequency that varies with input voltage
• Internal soft-start function to reduce start-up stresses
• Overvoltage protection and current sensing with high accuracy

Package

The package type of UC3842BD1 is SOIC-8 (Small Outline Integrated Circuit - 8 lead).

Pinout

The UC3842BD1 has an 8-pin SOIC package. The pin functions are:

• Pin 1: VCC (Positive supply voltage)
• Pin 2: GND (Ground)
• Pin 3: OUT (Output driver)
• Pin 4: COMP (Comparator input)
• Pin 5: FB (Feedback input)
• Pin 6: RST (Reset input)
• Pin 7: CT (Current sense input)
• Pin 8: NC (No connection)

This IC is a current-mode PWM controller, and these pins allow for the control of the output driver, comparator, feedback, reset, and current sensing functions.

Manufacturer

The manufacturer of the UC3842BD1 is STMicroelectronics, a Swiss-based multinational semiconductor company that specializes in designing and manufacturing microchips for various industries.

Applications

According to the product information, the application areas of UC3842BD1 are:

• Power supply applications (offline and DC-DC converters, battery chargers, LED drivers)
• Motor control
• Industrial controls
• Solar inverters

Equivalent

Based on STMicroelectronics' product family and market trends, some equivalent products to UC3842BD1 are:

• UC3843BD1
• UC3844BD1
• UC3845BD1
• NCP3801L
• NCP3802L

These devices share similar features and applications as the UC3842BD1, such as current-mode PWM control, soft-start, and overvoltage protection. However, please note that equivalent products may have slight variations in specifications or performance.