UCC3818N

Overview

The UCC3818N is a BiCMOS power factor preregulator controller designed for average current mode control. It operates within a switching frequency range of 6 kHz to 220 kHz and accepts a supply voltage between 9.7 V and 18 V. The device features a maximum duty cycle of 99% and supports a startup current of 150 µA. It is housed in a 16-pin PDIP package and functions within an operating temperature range of 0°C to 70°C.

Feature Summary

• Implements average current mode control for high-performance power factor correction
• Integrates a complete power factor preregulator solution with internal bias regulation
• Supports variable frequency operation across a wide switching range

Applications

• Power factor correction stages in AC-DC power supplies
• Offline switch-mode power supply preregulators
• Universal input power conversion systems

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation, as it defines the package type and tape/reel specifications. Confirm that the component meets RoHS compliance requirements if applicable to your manufacturing process. Ensure the ordering part number matches the exact package variant required for your PCB layout.

Selection Notes

Select this component when average current mode control is required for superior line regulation and harmonic performance compared to peak current mode. Verify that the 16-pin PDIP package aligns with your assembly capabilities and thermal management strategy. Ensure the input voltage range covers your system's operational requirements.

Part Context

The UCC3818 belongs to the UCCx81xA family of BiCMOS power factor preregulators from Texas Instruments. This series provides integrated solutions for improving power quality in offline applications. The N suffix specifically denotes the plastic dual in-line package variant within this product line.

Replacement Considerations

UCC3818AD

FAQ

What control mode does the UCC3818 utilize?

The UCC3818 utilizes average current mode control to achieve high power factor and low total harmonic distortion.

Is the UCC3818 suitable for high-frequency operation?

Yes, the device supports switching frequencies ranging from 6 kHz to 220 kHz, allowing flexibility in magnetics design.