FAN7528N

Overview

The FAN7528N 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 power loss. The device features low total harmonic distortion, precise adjustable output over-voltage protection, and open-feedback protection. Key electrical characteristics include a low start-up current of 40µA, operating current of 1.5mA, and a peak gate drive current of ±400mA. It operates within a supply voltage range of 9.5V to 25V and supports an operating temperature range from -25°C to +125°C.

Feature Summary

• Dual-output voltage control capability for multi-rail power supplies
• Voltage mode CRM operation eliminates the need for AC line voltage sensing networks
• Integrated protection mechanisms including open-feedback disable and adjustable over-voltage protection
• Totem-pole output stage with high state clamp for robust MOSFET driving

Applications

• Adapter power supplies
• Switching mode power supplies (SMPS)
• Ballast circuits
• LCD TV and LCD display power systems

Procurement Notes

Verify component authenticity through authorized onsemi or Fairchild channels due to discontinuation status. Confirm package integrity as SOP-8 variants may have specific handling requirements. Cross-reference availability with equivalent CRM controllers if original stock is exhausted. Ensure design compatibility with existing thermal management solutions given the 125°C maximum junction temperature rating.

Selection Notes

Select this controller for designs requiring dual-output PFC regulation with simplified input sensing. The voltage mode architecture reduces external component count compared to current mode alternatives. Consider the ±400mA gate drive capability when selecting external MOSFETs. Verify that the system meets THD specifications under varying load conditions, as the device optimizes performance at light loads.

Part Context

The FAN7528N belongs to the FAN752x series of CRM PFC controllers developed by Fairchild Semiconductor, now part of onsemi. This family targets high-efficiency power conversion in consumer electronics and lighting applications. The N suffix denotes the SOP-8 package variant, distinguishing it from DIP or other package options within the same functional family.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should evaluate generic CRM PFC controllers with similar voltage mode architectures and dual-output capabilities. Verify pinout compatibility and gate drive strength before implementing any alternative components.