L6566BTR

AC DC Converters, Offline Switchers Overview

The L6566BTR is a current-mode primary controller IC designed for high-performance offline flyback converters and single-stage PFC applications. It supports both fixed-frequency (FF) and quasi-resonant (QR) operation modes, with an externally programmable oscillator defining the switching frequency. The device features a maximum duty cycle of 75%, a switching frequency of 107 kHz, and operates within a temperature range of -40°C to +150°C. It includes a non-dissipative high-voltage start-up circuit, adaptive UVLO, and comprehensive protection functions such as output OVP and input brownout detection.

AC DC Converters, Offline Switchers Feature Summary

• Supports both fixed-frequency and quasi-resonant operation modes for optimized performance across load ranges.
• Integrates an innovative adaptive UVLO to manage self-supply voltage fluctuations caused by transformer parasitics.
• Includes a built-in non-dissipative high-voltage start-up circuit to minimize mains consumption at light loads.
• Provides valley skipping functionality at medium and light loads to maintain operation close to zero-voltage switching.

AC DC Converters, Offline Switchers Applications

• High-performance offline flyback converters
• Single-stage single-switch input-current-shaping converters (single-stage PFC)
• Applications requiring compliance with EN61000-3-2 regulations

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific ordering suffix to ensure the correct package type and tape/reel configuration match the assembly requirements. Confirm that the component meets RoHS standards if environmental compliance is mandatory for the final product. Check the latest datasheet revision to ensure all electrical characteristics and pin definitions align with the design specifications before integration.

AC DC Converters, Offline Switchers Selection Notes

Select this controller when designing flyback converters that require flexibility between fixed-frequency and quasi-resonant modes. It is suitable for applications needing low quiescent current and efficient light-load performance through burst-mode operation. Consider its current-mode control architecture for robust transient response and its integrated protections for simplified design in safety-critical power supplies.

AC DC Converters, Offline Switchers Part Context

The L6566B is part of STMicroelectronics' L6566 series of primary side controllers. It is specifically engineered for offline AC-DC conversion, offering enhanced efficiency and EMI mitigation compared to standard controllers. The 'TR' suffix indicates it is supplied in a tape-and-reel format, facilitating automated surface-mount assembly processes.

AC DC Converters, Offline Switchers Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Designers should verify pin compatibility and electrical parameter equivalence if considering alternative components from other manufacturers or different series within the same family.