ON Semiconductor UC3843BVDR2 High-Performance Current Mode PWM Controller

The UC3843BVDR2 is a high-performance current mode pulse-width modulation (PWM) controller from ON Semiconductor, designed for a wide range of power supply applications. This versatile IC is tailored to manage and drive continuous mode power supplies offering superior performance through enhanced stability, reduced noise, and improved efficiency.

Key Features

• Optimized for Off-Line and DC-to-DC Converters: The UC3843BVDR2 is specifically designed to work effectively in off-line and DC-to-DC converter applications, making it a go-to solution for a variety of power management tasks.
• Low Startup and Operating Current: The device boasts a low startup current of less than 1mA and an operating current of 2.5mA, allowing for efficient power usage and helping to extend the life of battery-powered devices.
• Trimmed Oscillator Discharge Current: The oscillator discharge current is precisely trimmed to ensure a stable and accurate duty cycle control over the full range of input line voltages and output loads.
• Current Mode Operation: Current mode control provides inherent input voltage feed-forward compensation, cycle-by-cycle current limiting, and easy loop compensation.
• Automatic Feed Forward Compensation: The UC3843BVDR2 includes automatic feed-forward compensation, improving the response to large input voltage variations and load changes.
• Pulse-by-Pulse Current Limiting: Enhanced system reliability is achieved through the pulse-by-pulse current limiting feature, which protects the IC in the event of output overload or short-circuit conditions.
• Under-Voltage Lockout with Hysteresis: The under-voltage lockout ensures that the PWM controller is off unless there is a sufficient supply voltage. This feature, combined with built-in hysteresis, helps prevent erratic operation during power-up and power-down sequences.

Applications

The UC3843BVDR2 is ideal for a variety of applications, including:

• Switch Mode Power Supplies (SMPS)
• DC-DC Converters
• Battery Chargers
• Power Supply for LED Drivers
• Telecom Power Systems
• Industrial Power Systems

With its robust design and versatile features, the UC3843BVDR2 from ON Semiconductor is an excellent choice for designers looking to create reliable and efficient power supply solutions. Its industry-standard footprint ensures easy implementation into a wide range of power applications.