TOP247FN

AC DC Converters, Offline Switchers Overview

The TOP247FN is a high-voltage power switch from the TOPSwitch-FX family, integrating a 700V MOSFET with a current-mode controller. It operates in fixed frequency mode at 132 kHz and supports primary-side regulation for isolated flyback converters. The device includes an internal high-voltage startup circuit, eliminating the need for auxiliary winding biasing during initial operation. Key electrical parameters include a drain-source breakdown voltage of 700 V, a continuous drain current capability of 2.5 A, and a maximum input voltage range up to 265 V AC. It features programmable cycle-by-cycle current limiting and adjustable output voltage via the control pin.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700 V power MOSFET with a high-performance current-mode controller on a single chip
• Enables primary-side regulation through integrated feedback sensing, removing the requirement for optocouplers and auxiliary windings
• Incorporates a built-in high-voltage startup circuit that powers the IC directly from the DC bus voltage
• Provides comprehensive protection mechanisms including overvoltage lockout, thermal shutdown, and cycle-by-cycle current limiting

AC DC Converters, Offline Switchers Applications

• Universal input offline flyback power supplies
• Battery chargers for consumer electronics and mobile devices
• Standby power supplies for televisions and monitors
• Adapters for set-top boxes and peripheral equipment

AC DC Converters, Offline Switchers Procurement Notes

Verify the suffix 'FN' indicates the specific package configuration and tape-and-reel packaging option. Confirm the manufacturer date code and lot traceability requirements against your quality standards. Ensure the ordering part number matches the exact switching frequency and current limit settings defined in the design specifications. Check for RoHS compliance status if required by regional regulations.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring high integration and reduced bill-of-materials count by eliminating optocouplers. The fixed 132 kHz switching frequency offers a balance between efficiency and EMI performance for general-purpose applications. Consider the thermal dissipation capabilities of the DIP-7 package when determining heatsinking requirements for higher power levels within the family's range.

AC DC Converters, Offline Switchers Part Context

This device belongs to the TOPSwitch-FX family, which represents an evolution of the original TOPSwitch technology. The FX series introduces enhanced features such as programmable current limit and improved line regulation compared to earlier generations. It is designed to simplify the design of isolated power supplies while maintaining high reliability and cost-effectiveness for mass-produced consumer and industrial equipment.

AC DC Converters, Offline Switchers Replacement Considerations

Compatible replacements within the same family include TOP244FN, TOP245FN, and TOP246FN, which share identical pinouts and package styles but differ in current limit thresholds and maximum output power capabilities. Ensure the substitute part meets or exceeds the required peak drain current and power handling specifications for the specific application load.