ON Semiconductor UC3843BDR2G High Performance Current Mode Controller

The UC3843BDR2G is a versatile and robust current mode pulse width modulation (PWM) controller manufactured by ON Semiconductor, designed for high-performance power supply applications. This integrated circuit is part of the UC3843 series, which is well-known for its reliability and efficiency in controlling switch-mode power supplies.

Key Features:

• Optimized for Off-line and DC-to-DC Converters: The UC3843BDR2G is designed to facilitate the design of low-cost, efficient power supplies, making it ideal for a variety of applications such as off-line converters and DC-to-DC converters.
• Low Start-Up Current: With a start-up current of just 0.5mA, this controller helps to reduce the overall power consumption during the initial power-up phase.
• Automatic Feed Forward Compensation: This feature enhances the performance of the controller by compensating for varying input voltages without the need for additional external components.
• Pulse-by-Pulse Current Limiting: The UC3843BDR2G provides excellent protection for the power supply by implementing pulse-by-pulse current limiting, which helps to prevent damage due to overcurrent conditions.
• Under-Voltage Lockout (UVLO) with Hysteresis: The built-in UVLO function ensures that the device operates only when the input voltage is within the specified range, thereby enhancing the safety and reliability of the system.
• High Current Totem Pole Output: The totem pole output is capable of handling high current, allowing for direct driving of the power MOSFET or IGBT in the power supply design.
• Trimmed Oscillator Discharge Current: The oscillator discharge current is accurately trimmed to ensure stable frequency operation across different temperature and supply variations.

Applications:

• Switching Power Supplies
• Power Supply Overcurrent Protection
• DC-DC Converters
• Battery Chargers
• Power Supply Supervisory Circuits

The UC3843BDR2G comes in a compact 8-pin SOIC package, making it suitable for space-constrained applications. Its robust design and comprehensive features make it an excellent choice for designers looking to create reliable and efficient power management systems. ON Semiconductor's commitment to quality ensures that the UC3843BDR2G meets the stringent requirements of modern electronic devices.