ON Semiconductor UC3843BNG High-Performance Current Mode PWM Controller

The UC3843BNG from ON Semiconductor is a highly versatile and robust current mode pulse width modulation (PWM) controller designed for high-performance power supply applications. This integrated circuit is engineered to provide efficient, reliable control for a wide range of power conversion technologies, including DC-DC converters, switch mode power supplies, and power factor correction circuits.

Key Features:

• Optimized for Off-Line and DC-to-DC Converters: The UC3843BNG is tailored for various applications including off-line and DC-to-DC converters, ensuring flexibility across different power management scenarios.
• Low Startup and Operating Current: This device boasts a low startup current of 0.5 mA (typical) and an operating current of 8.5 mA (typical), contributing to the overall efficiency of the power supply design.
• High Current Totem Pole Output: The totem pole output stage is capable of swinging 500 mA source and 500 mA sink current, making it suitable for driving power MOSFETs or IGBTs directly.
• Automatic Feed Forward Compensation: The UC3843BNG includes feed forward compensation to help maintain stable operation over a wide range of input voltages and output loads.
• Pulse-by-Pulse Current Limiting: Enhanced protection is provided through its pulse-by-pulse current limiting feature, which safeguards the controller and the power supply from short-circuit conditions.
• Under-Voltage Lockout with Hysteresis: The built-in under-voltage lockout (UVLO) with hysteresis ensures that the device operates only when the supply voltage is within an acceptable range.
• Trimmed Oscillator for Precise Frequency Control: The internal oscillator is trimmed to achieve precise frequency control, which is essential for reliable and predictable power supply performance.

Applications:

• Switch Mode Power Supplies (SMPS)
• DC-to-DC Converters
• Power Factor Correction (PFC) Modules
• Battery Chargers
• LED Drivers
• Telecom Power Supplies
• Industrial Power Systems

The UC3843BNG is presented in a standard 8-pin DIP package, making it easy to integrate into a variety of circuit boards. Its combination of features and performance makes it an excellent choice for designers seeking a reliable and efficient solution for their power management needs.