UC3843BNG

The UC3843BNG is a high performance current mode PWM controller designed for use in switching power supplies and other power control applications. It provides all 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.)

• VCC: Supply voltage pin
• COMP: Compensation pin for control loop
• FB: Feedback pin for regulation
• RT/CT: Timing resistor/capacitor pin for oscillator frequency setting
• GND: Ground connection
• OUTPUT: PWM output pin
• CS: Current Sense input for current mode control
• SENSE: Voltage sense for control and fault protection
• VREF: Reference voltage for internal error amplifier

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the UC3843BNG for a visual representation.

Key Features

• Current Mode Operation: High performance current mode operation for superior control of power supplies.
• Wide Operating Voltage Range: Operates from a single +8V to +35V supply, providing flexibility in various power system designs.
• Adjustable Frequency: External timing resistor and capacitor allow adjustable frequency operation.
• Overvoltage Protection: Integrates features for overvoltage protection and fault protection, ensuring safe and reliable operation.
• Low Startup and Operating Current: Low startup and operating currents make it suitable for low power and energy-efficient applications.

Note: For detailed technical specifications, please refer to the UC3843BNG datasheet.

Application

• Switching Power Supplies: Ideal for use in designing high-performance switching power supplies for various electronic systems.
• LED Drivers: Suitable for LED driver applications requiring efficient and precise current control.
• Voltage Regulators: Used in designing voltage regulators and DC-DC converters for stable power delivery.

Functionality

The UC3843BNG is a high performance current mode PWM controller that provides precise control and regulation in switching power supplies, LED drivers, and voltage regulator designs.

Usage Guide

• Power Supply: Connect VCC (Pin 1) to the supply voltage within the specified operating range.
• Feedback and Compensation: Properly configure the FB (Pin 3) and COMP (Pin 2) pins for stable regulation.
• Oscillator Frequency: Set the timing resistor and capacitor on the RT/CT (Pin 4) pin for the desired frequency of operation.

Frequently Asked Questions

Q: What is the operating voltage range of the UC3843BNG?
A: The UC3843BNG operates within a voltage range of +8V to +35V, providing flexibility in power supply designs.

Q: Is the UC3843BNG suitable for LED driver applications?
A: Yes, the UC3843BNG is suitable for LED driver applications requiring precise current control and efficiency.