UC3845BVDR2G

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: PWM Controller
• Characteristics:
  • High-performance current mode controller
  • Wide input voltage range
  • Adjustable frequency and duty cycle
  • Protection features for overvoltage, undervoltage, and overcurrent
• Package: SOIC-14
• Essence: Regulating and controlling the output voltage of power supplies efficiently
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 7V to 30V
• Output Voltage Range: 0V to 5.1V
• Frequency Range: 50kHz to 500kHz
• Duty Cycle Range: 0% to 100%
• 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. RT/CT: Timing resistor/capacitor connection
5. CT: Timing capacitor connection
6. GND: Ground
7. DRAIN: Power MOSFET drain connection
8. SYNC: Synchronization input
9. VCC: Supply voltage input
10. UVLO: Undervoltage lockout input
11. CS: Current sense input
12. SS/TR: Soft-start/Shutdown control pin
13. VSENSE: Voltage sense input
14. VDD: Internal bias voltage supply

Functional Features

• Current Mode Control: Provides stable and accurate regulation of output voltage by sensing the current flowing through the power MOSFET.
• Adjustable Frequency and Duty Cycle: Allows flexibility in designing power supplies for various applications.
• Protection Features: Incorporates overvoltage, undervoltage, and overcurrent protection to safeguard the power supply and connected devices.
• Soft-start/Shutdown Control: Enables smooth startup and shutdown of the power supply, reducing stress on components.

Advantages and Disadvantages

Advantages

• High-performance controller for efficient power supply regulation
• Wide input voltage range allows compatibility with different power sources
• Adjustable frequency and duty cycle provide flexibility in design
• Protection features enhance reliability and safety of the power supply

Disadvantages

• Limited output voltage range (up to 5.1V)
• Requires external timing resistor and capacitor for operation
• Not suitable for applications requiring higher output voltages or frequencies

Working Principles

The UC3845BVDR2G is a current mode controller that regulates the output voltage of power supplies. It operates by sensing the current flowing through the power MOSFET and adjusting the duty cycle of the PWM signal accordingly. The error amplifier compares the feedback voltage with the reference voltage to maintain the desired output voltage. By adjusting the timing resistor and capacitor, the frequency and duty cycle can be set according to the application requirements. The controller also incorporates protection features to prevent overvoltage, undervoltage, and overcurrent conditions.

Detailed Application Field Plans

The UC3845BVDR2G is widely used in various power supply applications, including:

1. Switching Power Supplies: Used in computer power supplies, telecommunication equipment, industrial control systems, and consumer electronics.
2. LED Lighting: Provides efficient control of LED drivers for lighting applications.
3. Battery Chargers: Regulates the charging process of batteries in automotive, industrial, and portable devices.
4. Motor Control: Enables precise control of motor speed and torque in industrial automation and robotics.
5. Audio Amplifiers: Used in high-power audio amplifiers to regulate the power supply voltage.

Detailed and Complete Alternative Models

1. UC3842B: Similar functionality with a lower output voltage range (up to 4.0V).
2. UC3843B: Similar functionality with a higher output voltage range (up to 8.0V).
3. UC3844B: Similar functionality with additional features for improved protection and control.
4. UC3846B: Similar functionality with integrated power factor correction (PFC) capability.

These alternative models provide options for different output voltage requirements and additional features based on specific application needs.

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