UC2843BD1R2G

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Mode PWM Controller
• Characteristics:
  • High-performance current mode PWM controller
  • Designed for low-power offline flyback converters
  • Provides precise control of output voltage and current
• Package: SOIC-8 (Small Outline Integrated Circuit)
• Essence: Regulates power supply output in various applications
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 7.6V to 30V
• Output Voltage Range: 0V to 5.1V
• Operating Temperature Range: -40°C to +85°C
• Frequency Range: 50kHz to 500kHz
• Duty Cycle Range: 0% to 100%
• Maximum Output Current: 1A

Detailed Pin Configuration

1. VREF: Reference Voltage Input
2. COMP: Error Amplifier Output
3. FB: Feedback Input
4. GND: Ground
5. CS: Current Sense Input
6. RT/CT: Timing Components Connection
7. OUT: Output
8. VCC: Supply Voltage Input

Functional Features

• Precise regulation of output voltage and current
• Overvoltage protection
• Undervoltage lockout
• Soft-start capability
• Adjustable frequency and duty cycle
• Error amplifier for feedback control
• Current sensing for accurate current limit

Advantages

• High-performance and reliable operation
• Wide input voltage range allows flexibility in various applications
• Compact SOIC-8 package for space-constrained designs
• Comprehensive protection features enhance system reliability
• Adjustable frequency and duty cycle provide versatility in power conversion

Disadvantages

• Limited maximum output current of 1A may not be suitable for high-power applications
• Requires external timing components for frequency and duty cycle control

Working Principles

The UC2843BD1R2G is a voltage mode PWM controller that regulates the output voltage of a power supply. It operates by comparing the feedback voltage (FB) with a reference voltage (VREF) to generate an error signal. This error signal is then amplified by the error amplifier (COMP) and used to control the duty cycle of the output waveform.

By adjusting the timing components (RT/CT), the frequency and duty cycle of the output waveform can be set according to the desired application requirements. The current sense input (CS) monitors the current flowing through the power supply, enabling accurate current limit protection.

Detailed Application Field Plans

The UC2843BD1R2G is commonly used in low-power offline flyback converters. It finds applications in various fields, including: - Consumer electronics - LED lighting - Battery chargers - Industrial controls - Telecommunications equipment

Detailed and Complete Alternative Models

• UC3843A: Higher maximum output current of 2A
• UC3844B: Enhanced features for improved performance
• UC3845C: Wide input voltage range up to 40V
• UC2853D: Dual-channel version for multi-output power supplies
• UC2863D: Higher frequency range for compact designs

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