UC3845BD1R2G

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: Regulating and controlling the pulse width modulation (PWM) signal
• 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
• Maximum Duty Cycle: 100%
• Oscillator Frequency Range: 50kHz to 500kHz
• Maximum Output Current: ±1A

Detailed Pin Configuration

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

Functional Features

• Current Mode Control: Provides excellent line and load regulation
• Pulse-by-Pulse Current Limiting: Protects against overcurrent conditions
• Soft Start: Prevents excessive inrush current during startup
• Under-Voltage Lockout (UVLO): Ensures proper operation under low voltage conditions
• Error Amplifier: Compares feedback voltage with reference voltage to regulate output

Advantages

• Wide input voltage range allows for versatile applications
• High-performance current mode control ensures accurate regulation
• Comprehensive protection features enhance system reliability
• Compact SOIC-8 package enables space-efficient designs
• Cost-effective solution for PWM control applications

Disadvantages

• Limited output current capability may not be suitable for high-power applications
• Requires external timing components for frequency adjustment
• Not compatible with all types of power supply topologies

Working Principles

The UC3845BD1R2G is a current mode controller that regulates the pulse width modulation (PWM) signal. It operates by comparing the feedback voltage from the FB pin with the reference voltage from the VREF pin. The error amplifier amplifies the difference between these voltages and drives the COMP pin accordingly. This drives the output through the OUT pin, controlling the duty cycle of the PWM signal. The UC3845BD1R2G also incorporates various protection features to ensure safe operation.

Detailed Application Field Plans

The UC3845BD1R2G is widely used in off-line and DC-to-DC converter applications. Some specific application areas include: - Switching Power Supplies - Battery Chargers - LED Drivers - Motor Control Circuits - Solar Power Systems

Detailed and Complete Alternative Models

• UC3843A: Similar functionality but with different package options
• UC3844B: Improved performance and additional features
• UC3846: Higher output current capability and wider input voltage range
• UC2845: Lower cost alternative with slightly reduced specifications

Note: These alternative models provide similar functionality but may have variations in performance, package, or other features.

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