Overview of Texas Instruments UCC3802N Low-Power BiCMOS Current-Mode PWM Controller

The Texas Instruments UCC3802N is a versatile and efficient low-power BiCMOS current-mode pulse width modulation (PWM) controller designed for a wide range of power supply applications. This integrated circuit is part of the UCC3800 series, which are known for their improved performance features such as reduced system cost, minimal external components, and low power operation.

Key Features

• Current-Mode Control: The UCC3802N employs current-mode control which provides superior transient response and simplified loop compensation over voltage-mode control.
• Low Startup and Operating Current: This device boasts a very low startup current of 0.5 µA (typical) and an operating current of 2.5 mA (typical), making it an excellent choice for energy-efficient applications.
• Automatic Feed-Forward Compensation: The inclusion of automatic feed-forward compensation adjusts the duty cycle according to input voltage variations, enhancing the performance across different input conditions.
• Trimmed Oscillator Discharge Current: The oscillator discharge current is trimmed to ensure precise duty cycle clamping, which is critical for protecting the power supply and the load under various conditions.
• High Peak Current Drive: The UCC3802N is capable of delivering a peak current of 1A, which is suitable for driving a power MOSFET directly, thus eliminating the need for additional driver components.

Applications

The UCC3802N is designed for a multitude of applications, including but not limited to:

• Off-line power supplies
• DC-DC converters
• Battery-operated equipment
• Power supplies for communication systems
• Adapters and chargers

Package and Reliability

This PWM controller is available in an 8-pin PDIP (Plastic Dual In-line Package), which is suitable for through-hole mounting on printed circuit boards. Texas Instruments ensures high reliability and performance consistency, making the UCC3802N a trusted choice for designers and engineers seeking a robust power management solution.

Conclusion

The UCC3802N from Texas Instruments stands out as a low-power, current-mode PWM controller that offers a blend of features tailored for efficient power supply design. Its low operational costs, high integration, and advanced features make it an ideal choice for a wide range of applications, delivering both performance and value to any power management system.