Fairchild FSB-Series Design Guidelines Application Note AN-9752

About this manual

This application note provides design considerations for the Fairchild FSB-series next-generation Green-Mode Power Switch (FPS™). It focuses on two unique functions: AX-CAP™ discharge and adjustable peak current limit. The document explains how to achieve constant power limits and designs the IPK pin level for appropriate Over-Power Protection (OPP) levels.

What's inside

• Introduction
• AX-CAP Technology
• Worst-Case Analysis
• Adjustable Peak Current Limit
• Constant Power Limit
• Over-Power Protection Level
• Design Example

Frequently asked questions

What is the function of AX-CAP technology?

AX-CAP™ discharge eliminates X-cap discharge resistors while meeting safety requirements by intelligently discharging the filter capacitor only when the power supply is unplugged.

What are the upper and lower clamping voltages of the IPK pin?

The upper and lower clamping voltages of the IPK pin are 3V and 1.5V, respectively.