L6563S

Overview

The L6563S 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 extremely low Total Harmonic Distortion (THD). The device includes an accurate internal voltage reference with 1% tolerance at 25 °C. Voltage feedforward function optimizes loop stability and improves line transient response during mains drops or surges. It supports tracking boost operation where output voltage tracks mains voltage.

Feature Summary

• Transition mode PFC control with enhanced THD performance
• Voltage feedforward for improved line transient response
• Tracking boost capability for variable output voltage
• Integrated protection against feedback loop failures

Applications

• Desktop PC power supplies
• Industrial Switching Mode Power Supplies (SMPS)
• Flat screen display pre-regulators
• ATX PSU PFC stages

Procurement Notes

Verify the specific suffix of the part number to confirm package type and reel specifications. Confirm that the selected variant matches the required operating temperature range and pin configuration for the target design. Ensure compatibility with the intended PWM controller interface if used in a cascaded system.

Selection Notes

Select this component for designs requiring low THD across a wide load range without complex control architectures. It is suitable for applications needing bidirectional line transient response and remote ON/OFF control capabilities. Consider its interface with downstream DC-DC converters for light-load energy saving compliance.

Part Context

The L6563S is an enhanced version of the L6563, maintaining the same pin-out while offering improved performance and additional functions. It belongs to the L6563S/L6563H/L6564D family of PFC controllers from STMicroelectronics. It is designed to replace older models in existing designs while providing better efficiency and harmonic reduction.

Replacement Considerations

The L6563 serves as the direct predecessor with identical pin-out. Verify functional equivalence regarding the enhanced features such as the specific THD correction circuit and voltage feedforward techniques before substitution.

FAQ

How does the L6563S handle line transients?

It utilizes a voltage feedforward function (1/V2 correction) that significantly improves line transient response during both mains drops and surges.

What protection features are included?

The IC provides overvoltage protection, protection against feedback loop failures, brownout handling, and detection of boost inductor saturation.