UCC3818NG4

Overview

The UCC3818NG4 is a BiCMOS power factor preregulator controller manufactured by Texas Instruments. It operates in average current mode to achieve high power factor correction. The device supports switching frequencies ranging from 6 kHz to 220 kHz and functions within a supply voltage range of 9.7 V to 18 V. It features a maximum duty cycle of 99% and includes integrated soft-start capabilities. The component is housed in a 16-pin PDIP package and is rated for operation between 0°C and 70°C.

Feature Summary

• Implements average current mode control for precise power factor correction
• Integrates a programmable oscillator with frequency range up to 220 kHz
• Includes internal soft-start circuitry to limit inrush current during startup

Applications

• Power factor correction preregulators for AC-DC converters
• Universal input power supplies
• Telecommunications power systems

Procurement Notes

Verify the specific suffix 'NG4' indicates lead-free construction and RoHS compliance as per Texas Instruments documentation. Confirm the package type matches the required through-hole mounting configuration for the target design. Ensure the ordering information aligns with the manufacturer's current production status and availability guidelines.

Selection Notes

Select this component when average current mode PFC is required for universal line applications. The wide operating frequency range allows optimization for transformer size and efficiency. Verify that the through-hole packaging suits the assembly process and that the thermal characteristics meet the system requirements.

Part Context

This part belongs to the UCC3818 family of BiCMOS power factor preregulators. It serves as a specialized controller designed to improve the efficiency of AC-DC power conversion stages. The device integrates essential control loops and protection features into a single monolithic IC.

Replacement Considerations

Consult Texas Instruments documentation for direct replacements or pin-compatible alternatives. Verify functional equivalence regarding control topology and electrical specifications before substitution.