L6563A

Overview

The L6563A is a current-mode Power Factor Correction (PFC) controller operating in Transition Mode (TM). It features a highly linear multiplier and crossover distortion correction for low THD across wide mains ranges. Key electrical parameters include a supply voltage range of 10.3V to 22V, a switching frequency of 70 kHz, and a maximum reverse current of 4500µA. The device operates within a temperature range of -25°C to +150°C and consumes ≤90 µA before start-up. It utilizes a 14-pin SOIC package.

Feature Summary

• Integrated internal multiplier significantly reduces total harmonic distortion (THD) for regulatory compliance.
• Voltage feedforward function improves loop stability and transient response to mains voltage changes.
• Comprehensive protection suite includes output overvoltage, brown-out, feedback disconnection, and boost inductor saturation detection.
• Supports tracking boost operation where output voltage tracks the mains voltage.

Applications

• High-end portable computer power supplies
• AC/DC adapters up to 240W
• LED drivers and luminaires
• Medical switched-mode power supplies

Procurement Notes

Verify the specific suffix against official STMicroelectronics documentation to confirm pinout and feature set. The L6563A lacks the boost inductor saturation protection found in the standard L6563 variant. Ensure compatibility with system standby requirements and thermal constraints during sourcing.

Selection Notes

Select the L6563A when cost-effective transition mode operation is required without the need for inductor saturation protection. It is suitable for designs where the DC-DC converter manages fault conditions or where simplified protection architecture is preferred. Compare against L6563 if saturation monitoring is mandatory.

Part Context

The L6563A belongs to the L6563 family of STMicroelectronics PFC controllers. It shares the core TM architecture with the L6563 but omits the boost inductor saturation protection circuit. This distinction allows for design flexibility in systems where alternative protection methods are employed or where component count minimization is prioritized.

Replacement Considerations

The L6563 serves as a functional substitute but includes additional boost inductor saturation protection not present in the L6563A. Verify that the target application does not rely on this specific protection mechanism before substituting.

FAQ

Does the L6563A include boost inductor saturation protection?

No, the L6563A does not include boost inductor saturation protection. This feature is exclusive to the standard L6563 part number.

What is the purpose of the voltage feedforward function?

The voltage feedforward function improves the stability of the control loop and enhances the transient response to sudden changes in mains voltage.