The UCC3801N is a versatile and robust PWM (Pulse Width Modulation) controller designed by Texas Instruments, aimed at delivering high performance for power supply applications. This controller is part of the UCC3800 family and is crafted using BiCMOS technology, which combines the speed of bipolar transistors with the low power consumption of CMOS technology, making it an ideal choice for energy-efficient power systems.

Key Features

• Low Start-Up and Operating Current: The UCC3801N boasts an impressively low start-up current of 150 µA and an operating current of 2.5 mA, which enhances the overall efficiency of the power supply system by reducing power loss during operation.
• Trimmed Oscillator Discharge Current: This feature ensures consistent and reliable operation of the oscillator, which is crucial for maintaining stable frequency and duty cycle control in the PWM process.
• Current Sense Discharge Transistor: A built-in discharge transistor provides a rapid discharge path for the current sense capacitor, which helps to improve response time and accuracy in current sensing applications.
• Automatic Feed Forward Compensation: This function compensates for input voltage variations without the need for external components, simplifying the design and enhancing performance.
• Pulse-by-Pulse Current Limiting: The UCC3801N offers excellent protection against overcurrent conditions by limiting the current on a pulse-by-pulse basis, which helps to prevent damage to the controller and other circuit components.
• Under-Voltage Lockout (UVLO): The integrated UVLO feature ensures that the controller operates only when the supply voltage is within the acceptable range, thereby safeguarding the system against low-voltage scenarios.

Applications

The UCC3801N is suitable for a wide range of applications, including:

• Off-line power supplies
• DC-DC converters
• Power supplies for communication equipment
• Industrial power systems
• Portable electronics

With its combination of low power operation, high integration, and robust protection features, the UCC3801N is a reliable and efficient solution for designers looking to optimize their power supply designs. Texas Instruments' commitment to quality ensures that this PWM controller will deliver consistent performance and durability for a variety of power management applications.