TOP243FN

AC DC Converters, Offline Switchers Overview

The TOP243FN is a high-voltage integrated switch from the PowerIntegrator family, combining a 725 V MOSFET with a PWM controller and oscillator. It operates in DPAK-5 packages. Key electrical parameters include a drain-source breakdown voltage of 725 V, an operating frequency range of 66 to 132 kHz, and a maximum peak current limit of 3.0 A. The device features fixed ON-time control for line regulation and includes comprehensive protection mechanisms such as cycle-by-cycle current limiting, thermal shutdown, and open-loop protection.

AC DC Converters, Offline Switchers Feature Summary

• Integrated high-voltage MOSFET and PWM controller for compact design
• Fixed ON-time architecture ensures stable line regulation
• Built-in thermal shutdown protects against overheating
• Open-loop detection prevents unsafe operation under fault conditions

AC DC Converters, Offline Switchers Applications

• Offline flyback converters
• Universal AC/DC power supplies
• Battery chargers
• Standby power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the suffix 'FN' indicates the specific tape-and-reel packaging variant. Confirm the manufacturer is Power Integrations. Check for RoHS compliance status if required by your assembly process. Ensure the component matches the DPAK-5 physical footprint specifications before integration into your PCB layout.

AC DC Converters, Offline Switchers Selection Notes

Select this component when designing flyback converters requiring high input voltage tolerance up to 725 V. The fixed ON-time feature simplifies compensation network design compared to variable frequency controllers. Consider the 3.0 A current limit for determining transformer turns ratio and output power capabilities within the specified operating temperature range.

AC DC Converters, Offline Switchers Part Context

This part belongs to the TOPSwitch-JX family, which integrates power switching and control logic into a single monolithic IC. This family targets cost-sensitive applications by reducing external component count. The TOP243FN specifically offers a higher current limit than lower-numbered variants in the series, allowing for greater power density in similar form factors.

AC DC Converters, Offline Switchers Replacement Considerations

Compatible substitutes include other TOPSwitch-JX variants like TOP244FN or TOP245FN, provided the current limit and power requirements align. Verify pinout compatibility and thermal characteristics when swapping between different current-rated devices within the same package type.