L6563

Overview

The L6563 is a current-mode Power Factor Correction (PFC) controller operating in Transition Mode (TM). It features a highly linear multiplier and a special correction circuit to reduce mains current crossover distortion, enabling wide-range operation with low Total Harmonic Distortion (THD). The device includes a voltage feedforward function for improved stability and transient response. It provides an interface with downstream PWM controllers to manage PFC stage enable/disable functions based on load conditions or fault states.

Feature Summary

• Transition Mode (TM) current-mode control architecture
• Integrated voltage feedforward for enhanced loop stability
• Interface capability for downstream DC-DC converter synchronization
• Protection mechanisms including overvoltage and inductor saturation detection

Applications

• Desktop PC power supplies
• High-power laptop adapters
• Flat screen display power systems
• Compliance with Energy Star and Blue Angel efficiency standards

Procurement Notes

Verify the specific suffix against the official STMicroelectronics datasheet to confirm pinout compatibility and feature set variations. Ensure the selected variant matches the required protection functions, such as boost inductor saturation detection, which may differ between sub-models like the L6563 and L6563A.

Selection Notes

Select this component for designs requiring high efficiency at light loads and strict harmonic compliance. The integrated interface allows the PFC stage to be disabled during light load conditions by the secondary side controller, facilitating easier adherence to energy-saving norms without complex external logic.

Part Context

The L6563 belongs to STMicroelectronics' family of transition-mode PFC controllers. It serves as a pre-regulator stage in two-stage AC-DC conversion architectures, working in conjunction with downstream PWM controllers to deliver regulated DC output from universal AC mains input.

Replacement Considerations

L6563A: Similar functionality but lacks the boost inductor saturation protection feature found in the L6563.