L6564H

Overview

The L6564H is a current-mode Power Factor Correction (PFC) controller operating in Transition Mode (TM). It integrates a high-voltage startup source, enabling efficient operation in applications where the PFC pre-regulator serves as the master stage. The device features a highly linear multiplier and a correction circuit to reduce mains current crossover distortion, ensuring wide-range mains operation with extremely low Total Harmonic Distortion (THD) across large load ranges. Output voltage regulation utilizes a voltage-mode error amplifier with an accurate internal reference. Loop stability is optimized via voltage feedforward (1/V2 correction), improving line transient response during mains drops and surges.

Feature Summary

• Integrated onboard 700 V startup source for simplified design
• Fast bi-directional input voltage feedforward (1/V2 correction)
• Accurate adjustable output overvoltage protection
• Protection against feedback loop disconnection with latched shutdown

Applications

• Ballasts
• Adapters
• Flat screen displays
• Switched-mode power supplies (SMPS)

Procurement Notes

Verify the specific package variant required, as the L6564 family includes both SSOP and SOIC options. Confirm that the high-voltage startup feature aligns with the system architecture, as this distinguishes the L6564H from standard versions. Ensure compliance with EN61000-3-2 or JEITA-MITI standards is a primary design goal, as these are key drivers for selecting this component.

Selection Notes

Select the L6564H when a transition-mode PFC controller with integrated high-voltage startup is necessary. It is suitable for SMPS up to 400 W requiring strict harmonic compliance. Consider its capability to drive high-power MOSFETs or IGBTs via the totem pole output stage. Evaluate if the fast bi-directional feedforward and brownout protections meet the specific transient and safety requirements of the target application.

Part Context

The L6564H belongs to STMicroelectronics' L6564 series of PFC controllers. It shares core functionalities with the base L6564 model but adds a high-voltage startup source. This addition makes it particularly suitable for energy-saving regulations and systems where the PFC preregulator acts as the master stage. The series supports compliance with EN61000-3-2 and JEITA-MITI standards.

Replacement Considerations

The L6564H is functionally compatible with the L6564, differing primarily by the inclusion of the high-voltage startup source. Verify pin compatibility and startup requirements before substituting. Other variants like L6564D or L6564T may lack the high-voltage startup feature.