UCC3819N

Overview

The UCC3819N is a Power Factor Correction (PFC) controller utilizing average current mode control, designed for high-performance power supply applications. It operates with a fixed switching frequency of 250 kHz and supports a supply voltage range of 10.8 V to 17 V. The device features a low start-up current of 150 µA to minimize standby power consumption. It is housed in a 16-pin PDIP package and is rated for an operating temperature range of 0°C to 70°C.

Feature Summary

• Implements average current mode control for precise input current shaping and high power factor correction.
• Integrates a fixed 250 kHz oscillator to simplify external component selection and reduce electromagnetic interference.
• Features low start-up current capability to enhance efficiency in energy-saving designs.

Applications

• Offline power supplies requiring high power factor correction
• Computer peripheral power supplies
• Telecommunications equipment power systems

Procurement Notes

Verify the specific suffix 'N' confirms the PDIP package variant, as other suffixes may indicate different packaging or temperature ratings. Confirm availability status, as this component may be discontinued or subject to lifecycle changes. Ensure compliance with RoHS directives if required by your manufacturing standards. Cross-reference the datasheet for exact pinout compatibility before integration.

Selection Notes

Select the UCC3819N when average current mode control is preferred over peak current mode for superior line regulation and noise immunity. Consider the 250 kHz fixed frequency for standard EMI filter design. Evaluate the 16-pin PDIP package constraints against board space requirements. Compare against newer integrated PFC solutions if system size or complexity reduction is a priority.

Part Context

The UCC3819 belongs to Texas Instruments' legacy UC38xx series of power management controllers. This family established standards for offline switch-mode power supply design. The UCC3819 specifically targets PFC applications, complementing other members like the UCC3810 (multi-topology controller) and UCC3813 (DC-DC controller).

Replacement Considerations

Check for direct pin-compatible upgrades within the UCC38xx family. Verify if newer generations offer improved thermal performance or extended temperature ranges. Ensure substitute components maintain the 250 kHz switching frequency characteristic if EMI filtering cannot be modified.