UC3842BD1R2G

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: PWM Controller
• Characteristics:
  • High-performance current mode controller
  • Designed for off-line and DC-to-DC converter applications
  • Provides necessary functions to implement single-ended or push-pull topology
• Package: SOIC-8
• Essence: Regulates the output voltage of power supplies
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 7.6V to 30V
• Output Voltage Range: 5V to 20V
• Maximum Duty Cycle: 50%
• Oscillator Frequency Range: 100kHz to 500kHz
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

1. VREF: Reference voltage input
2. COMP: Error amplifier output
3. FB: Feedback pin for regulating output voltage
4. GND: Ground reference
5. CS: Current sense input
6. RT/CT: Timing components connection
7. OUT: Output pin
8. VCC: Power supply input

Functional Features

• Current Mode Control: Provides stable regulation by sensing inductor current
• Pulse Width Modulation (PWM): Adjusts duty cycle to regulate output voltage
• Error Amplifier: Compares feedback voltage with reference voltage to control output
• Soft Start: Gradually increases duty cycle during startup to prevent overshoot
• Overcurrent Protection: Detects excessive current and shuts down the controller

Advantages

• Wide input voltage range allows for versatile applications
• High-performance current mode control ensures stable operation
• Compact SOIC-8 package enables space-saving designs
• Suitable for both off-line and DC-to-DC converter applications

Disadvantages

• Limited maximum duty cycle may restrict certain applications
• Requires external timing components for frequency adjustment

Working Principles

The UC3842BD1R2G is a current mode controller that regulates the output voltage of power supplies. It operates by sensing the inductor current and adjusting the duty cycle of the PWM signal to maintain a stable output voltage. The error amplifier compares the feedback voltage with the reference voltage, and any difference is amplified to control the output. During startup, the soft start feature gradually increases the duty cycle to prevent overshoot. The controller also incorporates overcurrent protection to ensure safe operation.

Detailed Application Field Plans

The UC3842BD1R2G is commonly used in various power supply applications, including: - Switching Power Supplies - Battery Chargers - LED Drivers - DC-to-DC Converters - Offline Power Adapters

Detailed and Complete Alternative Models

• UC3843BD1R2G
• UC3844BD1R2G
• UC3845BD1R2G
• UC3846BD1R2G
• UC3847BD1R2G

These alternative models offer similar functionality and characteristics, providing flexibility in design choices.

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