TOP257MG

AC DC Converters, Offline Switchers Overview

The TOP257MG is an integrated off-line switcher from the TOPSwitch-HX family, combining a high-voltage power MOSFET with PWM control and protection circuits. It operates at a switching frequency of 66 kHz with a maximum duty cycle of 78%. The device supports output powers up to 41 W and features a 700 V breakdown voltage. It is housed in a 10-lead SDIP package and functions within a junction temperature range of -40°C to 150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700 V power MOSFET with advanced fault protection and thermal shutdown.
• Utilizes frequency jittering to reduce electromagnetic interference (EMI).
• Achieves low standby and no-load power consumption through EcoSmart technology.

AC DC Converters, Offline Switchers Applications

• General purpose AC/DC converters
• Battery chargers
• Offline switch-mode power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout and feature variations. Ensure the component matches the required package type and electrical ratings for the target design. Cross-reference manufacturer part numbers to avoid counterfeit or obsolete stock.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring high integration and robust protection in compact form factors. Consider the 700 V rating for mains-connected applications. Evaluate thermal management requirements given the 150°C junction limit and the specific power output capabilities of the TOP257 variant.

AC DC Converters, Offline Switchers Part Context

This part belongs to the TOPSwitch-HX series, designed for cost-effective and reliable offline power conversion. The series integrates multiple functions into a single monolithic chip, simplifying design and reducing component count compared to discrete solutions.

AC DC Converters, Offline Switchers Replacement Considerations

Check for direct substitutes within the same TOPSwitch-HX family with compatible pinouts and electrical specifications. Verify that any alternative offers equivalent protection features and thermal performance.

AC DC Converters, Offline Switchers FAQ

What is the switching frequency of the TOP257MG?

The TOP257MG operates at a fixed switching frequency of 66 kHz.

Does the TOP257MG include overvoltage protection?

Yes, the device includes programmable overvoltage protection (OVP) as part of its integrated control circuitry.