FSDM311A

AC DC Converters, Offline Switchers Overview

The FSDM311A is a 650 V integrated power switch regulator designed for offline switching mode power supplies (SMPS). It combines a SenseFET with a voltage-mode PWM controller, featuring a fixed operating frequency of 67 kHz. The device supports a maximum duty cycle of 74% and delivers an output current of 500 mA. It operates within a temperature range of -25°C to +85°C and utilizes silicon technology in a DIP-8 through-hole package.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a high-voltage VDMOS SenseFET with a voltage-mode PWM control module to minimize external component count.
• Includes advanced protection mechanisms such as overvoltage protection (OVP), overload protection (OLP), and thermal shutdown (TSD) with auto-restart.
• Features a precise fixed operating frequency of 67 kHz and optimized gate drive circuitry for efficient performance.
• Incorporates internal startup circuitry, leading-edge blanking (LEB), and a temperature-compensated precision current source.

AC DC Converters, Offline Switchers Applications

• Offline flyback converters
• Switching mode power supplies (SMPS)
• AC/DC converters

AC DC Converters, Offline Switchers Procurement Notes

Verify the End-of-Life (EOL) status before procurement, as the manufacturer has issued discontinuance notifications indicating the product will be phased out. Confirm availability constraints and lead times with authorized distributors, as supply may be restricted or limited in certain regions. Ensure compliance with RoHS standards and check for any recent process change notifications (PCN) that might affect specifications or packaging.

AC DC Converters, Offline Switchers Selection Notes

Select the FSDM311A for designs requiring a simplified bill of materials and reduced system weight compared to discrete MOSFET solutions. Its integrated nature makes it suitable for cost-effective flyback converter architectures where space efficiency is critical. Consider its 650 V rating and 500 mA current capability against specific load requirements. Evaluate the need for its built-in protections like TSD and OVP to enhance system reliability without additional external components.

AC DC Converters, Offline Switchers Part Context

The FSDM311A belongs to onsemi's family of integrated power switches, which merge power transistors with control logic. This integration strategy aims to improve efficiency and reduce design complexity in power management applications. As part of the PMIC category, it serves as a complete solution for basic AC/DC conversion tasks, replacing traditional separate controller and MOSFET setups.

AC DC Converters, Offline Switchers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Due to the EOL status, alternative sourcing should focus on verifying compatible integrated power switches from other manufacturers or checking for updated series replacements directly from onsemi.