L4986ATR

Overview

The L4986ATR is a peak current-mode Power Factor Correction (PFC) controller designed for Continuous Conduction Mode (CCM) boost converters. It integrates a proprietary multiplier emulator and THD optimizers to ensure low Total Harmonic Distortion across all operating conditions. The device features an 800 V high-voltage startup block with X-capacitor discharge circuitry, eliminating the need for external discharge resistors. It operates in quasi-fixed frequency mode at 65 kHz for the 'A' variant. The IC includes comprehensive protection mechanisms such as overvoltage, feedback loop failure detection, boost inductor saturation protection, brownout protection, and soft-start functionality.

Feature Summary

• Proprietary multiplier emulator and THD optimizers for low harmonic distortion
• Integrated 800 V high-voltage startup with X-capacitor discharge capability
• Quasi-fixed frequency operation via proprietary off-time modulator
• Comprehensive protection suite including OVP, brownout, and saturation detection

Applications

• CCM-operated boost PFC pre-regulators compliant with EN61000-3-2
• Power supplies adhering to JEIDA-MITI standards
• Medical equipment requiring compliance with IEC 60601-1-2 regulations
• Applications meeting Energy Star and DoE energy saving requirements

Procurement Notes

Verify the specific suffix 'ATR' against the manufacturer's official datasheet to confirm tape-and-reel packaging and exact frequency variant. Ensure compatibility with the required switching frequency and package type for your design. Cross-reference the ordering part number with STMicroelectronics documentation to avoid confusion with other variants in the L4986 series.

Selection Notes

Select this component for designs requiring high-performance PFC with minimal external component count. The integrated high-voltage startup simplifies EMI filter design by removing discharge resistors. Consider the 65 kHz operating frequency for the 'A' variant when designing magnetic components. Ensure the application benefits from the built-in protections for robustness in varying mains conditions.

Part Context

The L4986 belongs to STMicroelectronics' PMIC portfolio, specifically within the power factor correction controllers category. It is part of the L4986 series, which offers solutions for power ranges spanning from hundreds of watts to several kilowatts. The device is designed to replace discrete solutions, offering a high-performance alternative for AC-DC front-end applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult STMicroelectronics documentation for potential cross-references or newer generations within the same product family.