FAN7528MX

Overview

The FAN7528MX is a dual-output critical conduction mode (CRM) power factor correction controller manufactured by Fairchild Semiconductor. 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 an 8-pin SOP package and includes integrated protections such as under-voltage lockout with 3.5V hysteresis, MOSFET over-current protection, and precise adjustable output over-voltage protection.

Feature Summary

• Supports dual-output voltage control for simultaneous regulation
• Operates in critical conduction mode using voltage-mode PWM
• Integrates zero current detection for efficient switching
• Includes open-feedback protection and disable function

Applications

• Power adapters
• Dual-output power supplies
• Active power factor correction circuits

Procurement Notes

Verify the component authenticity through official Fairchild Semiconductor channels or authorized distributors. Confirm that the specific suffix 'MX' corresponds to the 8-pin SOP package variant. Ensure compliance with RoHS standards and lead-free requirements as specified in the manufacturer's documentation before integration into production systems.

Selection Notes

Select this controller for applications requiring high power factor and low total harmonic distortion without the complexity of current-mode sensing networks. It is suitable for designs needing independent dual-output regulation. Consider the internal start-up timer and gate drive capabilities when designing the external MOSFET driver stage.

Part Context

The FAN7528MX belongs to the FAN7528 series of active PFC controllers. Variants include FAN7528M, FAN7528N, and FAN7528, differing primarily in package types such as DIP or SOP. These components are designed to replace older CRM PFC solutions by simplifying the circuit topology while maintaining performance standards for consumer electronics power supplies.

Replacement Considerations

Direct substitutes within the same family include FAN7528M and FAN7528N. Verify pin compatibility and thermal characteristics when replacing with other manufacturers' CRM PFC controllers.