UC3845AD8

The UC3845AD8 is a high performance current mode PWM controller specifically designed for off-line and DC-to-DC converter applications. It provides the necessary functions to implement off-line or DC-to-DC fixed frequency current mode control schemes with a minimum number of external components.

Pinout

(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

• RT/CT: Timing resistor/ capacitor pin
• EA: Error amplifier inverting input
• COMP: Output of the error amplifier
• FB: Feedback input for the error amplifier
• VCC: Supply voltage pin
• SD: Shutdown pin
• VREF: Reference voltage output
• OSC: Oscillator timing capacitor pin
• UVLO: Under voltage lockout
• OUT: Output transistor collector of the output stage
• CS: Current sense input pin
• GND: Ground pin

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the UC3845AD8 for a visual representation.

Key Features

• High Performance: The UC3845AD8 delivers high performance current mode control for efficient power conversion.
• Wide Operating Voltage Range: Supports a wide input voltage range, making it suitable for various power supply applications.
• Programmable Oscillator: The oscillator frequency can be programmed externally over a wide range to optimize efficiency and size.
• Output Drive Capability: The output stage is capable of sourcing and sinking 1A of current.
• Protection Features: Includes features such as under-voltage lockout, soft start, and shutdown for enhanced system protection.

Note: For detailed technical specifications, please refer to the UC3845AD8 datasheet.

Application

• Off-Line Power Supplies: Ideal for off-line power supply applications requiring high performance current mode control.
• DC-to-DC Converters: Suitable for use in DC-to-DC converter applications with fixed frequency current mode control schemes.
• LED Drivers: Can be used in LED driver circuits for efficient and reliable power regulation.

Functionality

The UC3845AD8 is a high performance current mode PWM controller designed for off-line and DC-to-DC power conversion applications. It provides the necessary functions for efficient and precise power regulation.

Usage Guide

• Timing Components: Connect timing resistor (RT) and timing capacitor (CT) to set the oscillator frequency.
• Feedback Loop: Connect the feedback components to the FB pin for error amplification and regulation.
• Current Sensing: Connect the current sense components to the CS pin to monitor the output current.

Frequently Asked Questions

Q: What is the maximum output drive capability of the UC3845AD8?
A: The output stage is capable of sourcing and sinking 1A of current, providing robust drive capability.

Q: Can the UC3845AD8 be used in LED driver circuits?
A: Yes, the UC3845AD8 is suitable for use in LED driver circuits to achieve efficient and reliable power regulation in LED lighting applications.