L6566BH

AC DC Converters, Offline Switchers Overview

The L6566BH is a current-mode primary controller IC designed for high-performance offline flyback converters and single-stage PFC applications. It features selectable multimode operation, supporting both fixed frequency and quasi-resonant modes. The device includes an on-board 840 V high voltage startup circuit and advanced light load management to minimize quiescent current below 3 mA. It provides line feedforward for constant power capability, pulse-by-pulse overcurrent protection, transformer saturation detection, and programmable frequency modulation for EMI reduction. The gate driver supports -600/+800 mA with active pull-down during UVLO.

AC DC Converters, Offline Switchers Feature Summary

• Selectable multimode operation allowing switching between fixed frequency and quasi-resonant modes
• Integrated 840 V high voltage startup circuit eliminating external startup resistors
• Advanced light load management ensuring low quiescent current consumption
• Line feedforward mechanism maintaining constant power capability across mains voltage variations

AC DC Converters, Offline Switchers Applications

• High-performance offline flyback converters running off rectified 3-phase input lines
• Single-stage, single-switch input-current-shaping converters (single-stage PFC)
• Hi-end portable computer power supplies requiring high average efficiency
• AC-DC adapters targeting universal input mains ranges

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix and package variant against the official STMicroelectronics datasheet to ensure compatibility with design requirements. Confirm RoHS compliance status and Ecopack2 packaging details. Check for any recent lifecycle notices or obsolescence warnings directly from the manufacturer before finalizing procurement plans.

AC DC Converters, Offline Switchers Selection Notes

Select this component when designing flyback converters that require flexible switching mode operation to optimize efficiency across varying load conditions. It is suitable for applications needing integrated high-voltage startup and precise light-load management. Ensure the design accommodates the SO16N package and utilizes the available protection features like OVP and brownout protection.

AC DC Converters, Offline Switchers Part Context

The L6566BH belongs to the L6566 series of multi-mode controllers for SMPS, positioned alongside variants like the L6566A and L6566B. It is part of STMicroelectronics' portfolio of power management ICs aimed at improving converter efficiency and reducing electromagnetic interference through advanced control algorithms and integrated protection mechanisms.

AC DC Converters, Offline Switchers Replacement Considerations

Consult official substitution lists for direct equivalents. Verify pin compatibility and electrical specifications if considering alternative controllers from other manufacturers.