FAN7528M

Overview

The FAN7528M is a dual-output, critical conduction mode (CRM) power factor correction controller designed for boost PFC applications. It utilizes voltage-mode PWM to generate MOSFET turn-off signals without requiring rectified AC line voltage information, thereby reducing input sensing network power loss. The device features low total harmonic distortion and supports two independent output voltage controls. Key protections include adjustable over-voltage protection, open-feedback disable, zero current detection, and MOSFET over-current protection. It operates with a low start-up current of 40µA and includes an internal 160µs start-up timer.

Feature Summary

• Dual-output voltage control capability for independent regulation
• Voltage-mode CRM operation eliminates need for AC line sensing
• Integrated open-feedback protection and disable function
• Totem-pole gate drive output with high state clamp

Applications

• Power adapters
• Switching mode power supplies
• Battery chargers

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to potential availability constraints. Confirm RoHS compliance status and specific package variant (SOP-8) against the official datasheet before integration. Ensure design compatibility with the specified operating temperature range and electrical parameters defined in the product specification document.

Selection Notes

Select this component for designs requiring dual-output PFC with simplified input sensing architecture. The voltage-mode control strategy reduces external component count compared to current-mode alternatives. Verify that the application requires critical conduction mode operation and can accommodate the specific protection thresholds provided by the integrated circuit features.

Part Context

The FAN7528M belongs to the Fairchild Semiconductor FAN7528 family of active PFC controllers. This series focuses on boundary mode control for efficiency optimization in medium-power applications. The MX suffix indicates the SOP-8 surface-mount package variant, distinguishing it from DIP or other package options within the same functional family.

Replacement Considerations

L6561D is listed as a similar alternative part number.