UC3854N

Overview

The UC3854N is a high power-factor preregulator controller from Texas Instruments, designed for average current mode control in power factor correction applications. It operates within a supply voltage range of 14.5V to 30V and supports switching frequencies up to 200 kHz. The device features a 16-pin PDIP package with through-hole mounting. Key electrical parameters include a maximum operating temperature of +70°C and a minimum of 0°C. It integrates essential functions such as zero-power detection and soft-start capabilities.

Feature Summary

• Implements average current mode control for precise input current shaping
• Integrates dedicated multiplier/divider circuitry for sinusoidal line tracking
• Includes built-in zero-power detection logic for light-load efficiency
• Features internal soft-start mechanism to limit inrush current during startup

Applications

• Active power factor correction stages in AC-DC power supplies
• High power-factor preregulators for offline converters
• Compliance circuits for harmonic emission standards
• Boost converter topologies requiring sinusoidal input current

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm package type and temperature grade. Ensure the ordering part number matches the required industrial specifications. Cross-reference datasheet revisions to validate pinout compatibility and functional parameters before integration into designs.

Selection Notes

Select this component for designs requiring average current mode PFC control with through-hole packaging. Consider the 200 kHz switching frequency capability and 30V maximum supply voltage limits. Evaluate thermal management requirements for the PDIP package within the specified operating temperature range.

Part Context

This component belongs to the UC3854 family of power factor correction controllers manufactured by Texas Instruments. It serves as a specialized integrated circuit for managing input current waveforms in switch-mode power supplies. The N suffix denotes the standard commercial temperature grade and PDIP physical package configuration.

Replacement Considerations

UC3854AN: Commercial grade variant with identical functionality but potentially different manufacturing lot specifications.

FAQ

What control topology does the UC3854N utilize?

It utilizes average current mode control to shape the input current waveform.

Is zero-power detection included in this IC?

Yes, the UC3854N includes integrated zero-power detection logic.