TOP256MG

AC DC Converters, Offline Switchers Overview

The TOP256MG is a high-voltage integrated circuit from the Power Integrations TOPSwitch-FX family, designed for offline AC-DC conversion. It integrates a 700 V power MOSFET with a current-mode controller and high-voltage startup circuitry within an eSIP-7C package. The device supports universal input voltages ranging from 85 V to 265 V AC. It operates at a fixed switching frequency of 66 kHz or 132 kHz, enabling efficient power delivery up to 119 W depending on the application design. The component features comprehensive protection mechanisms including cycle-by-cycle current limiting, overvoltage protection, and thermal shutdown.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700 V power MOSFET with a high-voltage startup circuit and current-mode controller in a single compact package.
• Provides robust protection through cycle-by-cycle current limiting, overvoltage protection, and thermal shutdown capabilities.
• Supports universal AC input voltage ranges from 85 V to 265 V for global compatibility.

AC DC Converters, Offline Switchers Applications

• Offline AC-DC power supplies
• Battery chargers
• Consumer electronics adapters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'MG' against official Power Integrations documentation to confirm the exact package type and tape-and-reel specifications. Ensure that the ordering information matches the required lead times and availability status for this specific variant. Cross-reference the datasheet revision date to confirm compliance with current RoHS standards and material declarations before finalizing procurement orders.

AC DC Converters, Offline Switchers Selection Notes

Select the TOP256MG when designing isolated flyback converters requiring high integration and reliability. Consider the eSIP-7C package for applications needing enhanced thermal performance and reduced footprint compared to traditional DIP packages. Evaluate the fixed frequency operation for EMI filter sizing and ensure the 700 V breakdown voltage aligns with the transformer primary side requirements of the target power supply topology.

AC DC Converters, Offline Switchers Part Context

The TOP256MG belongs to the TOPSwitch-FX family, which represents a generation of highly integrated power switches. This family is characterized by its ability to simplify design through the inclusion of auxiliary winding regulation and advanced protection features. The MG suffix typically denotes a specific packaging configuration, often related to the eSIP form factor, distinguishing it from other variants like the PN or EN series within the same electrical family.

AC DC Converters, Offline Switchers Replacement Considerations

Direct replacements include the TOP256PN and TOP256EN, provided the PCB layout accommodates the respective DIP-8 or eSIP-7C package differences. Verify pinout compatibility and thermal dissipation characteristics when substituting between these variants. Ensure that any alternative component meets the same 700 V rating and control logic specifications to maintain system stability.