L4986BTR

Overview

The L4986BTR 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 operates at a fixed switching frequency of 130 kHz, distinguishing it from the 65 kHz variant. Key features include an 800 V high-voltage startup block with X-capacitor discharge circuitry, enabling compliance with safety regulations without external discharge resistors. It supports power ranges from hundreds of watts to several kilowatts.

Feature Summary

• Proprietary off-time modulator ensures quasi-fixed frequency operation in all conditions
• Integrated 800 V high voltage startup with automatic X-capacitor discharge capability
• Advanced protection mechanisms including overvoltage, brownout, feedback failure, and inductor saturation detection
• Adjustable power good comparator for monitoring PFC output voltage status

Applications

• Compliance with EN61000-3-2 and JEIDA-MITI harmonic standards
• Medical equipment requiring IEC 60601-1-2 mains dip regulation
• Systems adhering to Energy Star and DoE energy saving requirements
• Safety-critical applications meeting IEC 61010-1 or IEC 62368-1 standards

Procurement Notes

Verify the specific suffix 'BTR' corresponds to the 130 kHz frequency variant and SO-8 tape-and-reel packaging configuration. Confirm that the high-voltage startup and X-capacitor discharge features align with your safety design requirements. Ensure compatibility with CCM boost converter topologies within the intended power range. Cross-reference the datasheet for pinout and thermal characteristics before finalizing procurement.

Selection Notes

Select this component when designing CCM PFC pre-regulators requiring low THD performance and high efficiency. The 130 kHz frequency offers a balance between component size and switching losses compared to lower frequencies. The integrated X-capacitor discharge simplifies design by removing the need for parallel discharge resistors. Consider the 800 V startup feature for systems lacking auxiliary power supplies during standby.

Part Context

The L4986 series belongs to STMicroelectronics' portfolio of PMICs focused on power factor correction. It utilizes BCD technology to integrate high-voltage capabilities with precise analog control circuits. The device is part of a family offering different frequency options to suit various application constraints, specifically targeting high-performance AC-DC conversion stages.

Replacement Considerations

The L4986A serves as a functional alternative but operates at 65 kHz instead of 130 kHz. Verify if the switching frequency difference impacts transformer or inductor design. No other direct substitutes are confirmed in public documentation.