Product Overview: Texas Instruments UCC2813D-3

The UCC2813D-3 is a high-performance, fixed-frequency current-mode PWM controller from Texas Instruments. This device is a part of the UCC28C series, which is designed to offer a variety of improvements over similar devices, including lower startup current, improved frequency stability, and enhanced features for power supply design. The UCC2813D-3 is particularly well-suited for applications requiring a fixed 3.3V output voltage.

Key Features

• Low Startup and Operating Current: The UCC2813D-3 boasts a startup current of typically 0.5µA and an operating current of typically 2.5mA, ensuring energy-efficient operation.
• Trimmed Oscillator Discharge Current: This feature helps in maintaining the frequency stability over the entire duty cycle range.
• Current Mode Control: Provides improved transient response and simplified loop compensation over voltage mode control.
• 100% Duty Cycle Capability: Allows for maximum output voltage in dropout conditions.
• High Current Totem Pole Output: Capable of driving the gate of a power MOSFET directly, this output is both sink and source capable.
• Internal Soft Start: Minimizes stress on the input power source by gradually increasing the duty cycle during startup.
• Automatic Feed Forward Compensation: Helps to maintain stability over a wide range of input voltages.

Applications

The UCC2813D-3 is ideal for a broad range of applications, including:

• DC to DC converters
• Off-line power supplies
• AC-DC adaptors/chargers
• Telecommunication equipment
• Industrial power systems

Technical Specifications

The UCC2813D-3 operates at a fixed frequency of 100kHz and can handle a wide input voltage range. It is offered in a 14-pin SOIC (Small Outline Integrated Circuit) package, which is well-suited for space-constrained applications. The operating temperature range of this device spans from -40°C to +85°C, allowing for reliable performance in a variety of environmental conditions.

Conclusion

The UCC2813D-3 PWM controller from Texas Instruments is an efficient, reliable solution for power management in electronic systems. Its robust feature set and wide range of applications make it a versatile choice for designers looking to optimize their power supply designs.