L6561D

Overview

The L6561D is a transition mode power factor corrector (PFC) controller manufactured by STMicroelectronics. It serves as an improved version of the L6560, featuring a superior multiplier for excellent total harmonic distortion (THD) in wide input voltage applications ranging from 85V to 265V AC. The device operates with micro-power start-up current and very low quiescent supply current to minimize power dissipation. It includes a disable function on the ZCD pin for lower standby consumption and offers precise adjustable output overvoltage protection without requiring external low-pass filters on the current sense.

Feature Summary

• Transition mode operation optimized for electronic lamp ballasts, AC-DC adaptors, and SMPS
• Totem pole output stage capable of driving Power MOS or IGBT with ±400mA source and sink currents
• Integrated on-chip filter eliminates the need for external low-pass filtering on the current sense path
• Disable function implemented on the ZCD pin to guarantee lower current consumption in stand-by mode

Applications

• Electronic lamp ballasts
• AC-DC adaptors
• Switched-mode power supplies (SMPS)

Procurement Notes

Verify component status before procurement as the L6561D is classified as NRND (Not Recommended for New Designs). Confirm package availability in SOIC-8 format and ensure design compatibility with existing infrastructure given the discontinuation recommendation. Review latest datasheet revisions for any specific handling or testing requirements associated with end-of-life management.

Selection Notes

Select this component for designs requiring transition mode PFC control with wide input voltage range capabilities. Consider its compatibility with the standard L6560 if migration is needed, noting the enhanced multiplier performance and reduced start-up current. Ensure the application benefits from the integrated current sense filter and the specific drive capability of the totem pole output stage for the intended power switch.

Part Context

The L6561D belongs to the L6561 series of power factor correctors from STMicroelectronics. It is realized in mixed BCD technology, providing benefits such as a 1% precision internal reference voltage and soft output overvoltage protection. This series represents an evolution from the earlier L6560, offering improved performance metrics while maintaining functional compatibility for broader application support.

Replacement Considerations

The L6561D is explicitly noted as Not Recommended for New Design (NRND). While the L6562 is described as pin-to-pin compatible with improved performance, official substitution data must be verified against current manufacturer recommendations. No other public confirmed substitute part numbers are available in the provided documentation.