KA5M0365RTU

AC DC Converters, Offline Switchers Overview

The KA5M0365RTU is a Fairchild Power Switch (FPS) integrated circuit designed for offline switch-mode power supplies. It integrates a high-voltage power SenseFET with a current-mode PWM controller. The device operates at a fixed frequency of 67 kHz and supports flyback and forward topologies. It functions within a supply voltage range of 9V to 30V, featuring internal thermal shutdown, overcurrent limiting, and overvoltage protection.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a high-voltage power SenseFET with a current-mode PWM controller for minimal external component requirements.
• Includes built-in protection mechanisms such as pulse-by-pulse overcurrent limiting, overload protection, and internal thermal shutdown.
• Features an auto-restart function and an internal high-voltage sense FET for simplified design.

AC DC Converters, Offline Switchers Applications

• Offline switch-mode power supplies
• Flyback converter designs
• Forward converter applications

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix RTU against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status directly from the datasheet, as legacy parts may have varying environmental declarations. Ensure the source document explicitly lists this part number to avoid confusion with similar FPS family members.

AC DC Converters, Offline Switchers Selection Notes

Select this component for cost-effective offline power supply designs requiring integrated protection. The fixed 67 kHz switching frequency suits applications where electromagnetic interference filtering is manageable. Verify that the TO-220-4 FP package meets the thermal dissipation requirements of the target application without excessive heatsinking.

AC DC Converters, Offline Switchers Part Context

This part belongs to the Fairchild Power Switch (FPS) family, which was acquired by onsemi. The FPS series combines a high-voltage MOSFET with control logic to reduce bill-of-materials count in AC-DC conversion circuits. This specific model represents the 67 kHz variant within the broader KA5x03xx series lineup.

AC DC Converters, Offline Switchers Replacement Considerations

Compatible substitutes include KA1M0365R and KA5L0365RN, provided the switching frequency difference is acceptable. Verify pinout compatibility and thermal performance before substitution. Check for updated manufacturing sources due to potential obsolescence or acquisition transitions.