TOP257EN

AC DC Converters, Offline Switchers Overview

The TOP257EN is an integrated offline switcher from the TOPSwitch-HX family, manufactured by Power Integrations. It combines a 700 V power MOSFET with high-voltage switching current sources, PWM control, and thermal shutdown circuits in a single monolithic device. The component operates at a switching frequency of 132 kHz with a maximum duty cycle of 83%. It supports universal input voltages ranging from 85 VAC to 265 VAC and delivers up to 119 W of output power. Designed for through-hole installation, it utilizes an eSIP-7C package. The device features EcoSmart technology for low standby power consumption and includes comprehensive fault protection mechanisms.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700 V power MOSFET with advanced PWM controller and protection circuits on a single chip
• Features EcoSmart technology to achieve ultra-low standby and no-load power consumption
• Includes built-in thermal shutdown and multiple fault protection capabilities for enhanced reliability

AC DC Converters, Offline Switchers Applications

• Universal input AC/DC converters
• Offline power supplies for consumer electronics
• Battery chargers and adapters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'EN' corresponds to the eSIP-7C through-hole package when sourcing. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer. Ensure design compatibility with the specified 132 kHz switching frequency and thermal requirements for the target application environment.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring high power density and robust protection in through-hole applications. The eSIP-7C package offers low thermal impedance suitable for heatsink mounting without additional clips. Consider the 119 W power capability and 132 kHz frequency for optimizing transformer size and system efficiency compared to lower-frequency alternatives.

AC DC Converters, Offline Switchers Part Context

The TOP257EN belongs to the TOPSwitch-HX family, which provides enhanced feature sets and extended power ranges. This series is designed to lower system costs and increase design flexibility through multi-mode operation that maximizes efficiency across all load conditions. The family supports various packages including eSIP-7F and eSIP-7C to accommodate different height and thermal constraints.

AC DC Converters, Offline Switchers Replacement Considerations

TOP257PN (DIP-8 package)

AC DC Converters, Offline Switchers FAQ

What is the breakdown voltage of the internal MOSFET?

The internal power MOSFET has a breakdown voltage of 700 V.

Does the TOP257EN support universal input voltage ranges?

Yes, it supports an input voltage range from 85 VAC to 265 VAC.