TOP254EN

AC DC Converters, Offline Switchers Overview

The TOP254EN is an integrated off-line switcher from the TOPSwitch-HX family, manufactured by Power Integrations. It combines a 700 V power MOSFET with high-voltage switching current source, PWM controller, oscillator, thermal shutdown circuit, and fault protection on a single monolithic chip. The device operates in flyback topology with selectable switching frequencies of 66 kHz and 132 kHz. It supports universal input voltages ranging from 85 VAC to 265 VAC. The component delivers up to 62 W of output power and features a maximum duty cycle of 78%. It includes user-programmable output overvoltage protection (OVP) for latching or non-latching shutdown with fast AC reset, line undervoltage detection, and line overvoltage shutdown. The operating junction temperature range spans from -40 °C to +150 °C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700 V power MOSFET with advanced control circuits including PWM controller and oscillator on a single monolithic chip.
• Features user-programmable output overvoltage protection allowing configurable latching or non-latching shutdown modes with fast AC reset.
• Includes line undervoltage detection to prevent turn-off glitches and line overvoltage shutdown to extend surge limits.
• Supports multi-mode operation to maximize efficiency across all load conditions while maintaining low standby and no-load power consumption.

AC DC Converters, Offline Switchers Applications

• Universal input offline AC-DC converters
• Flyback power supply designs
• Adapters and chargers requiring compact form factors
• General purpose isolated power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific ordering suffix 'EN' corresponds to the eSIP-7C package configuration as documented in official datasheets. Confirm that the procurement channel provides genuine components from Power Integrations or authorized distributors. Check RoHS compliance status and manufacturing origin details against current product change notices. Ensure storage and handling procedures adhere to moisture sensitivity level requirements specified in the manufacturer's guidelines. Validate part authenticity through serial code verification if available.

AC DC Converters, Offline Switchers Selection Notes

Select the TOP254EN when designing flyback converters requiring up to 62 W output power with universal input voltage ranges. Consider this component for applications needing integrated thermal protection and programmable overvoltage safeguards. Evaluate the eSIP-7C package suitability for space-constrained designs where low thermal impedance is critical. Compare performance against other TOPSwitch-HX variants based on specific frequency selection needs between 66 kHz and 132 kHz. Assess system cost implications regarding the elimination of external heat sinks for lower power outputs.

AC DC Converters, Offline Switchers Part Context

The TOP254EN belongs to the TOPSwitch-HX family, which represents an enhanced version of Power Integrations' integrated switcher lineup. This family offers improved design flexibility and lower system costs compared to previous generations. The TOP254 variant specifically targets higher power applications within the HX series, providing extended power range capabilities. It shares architectural similarities with other TOPSwitch-HX devices but differs in power handling specifications and package options. The family emphasizes simplicity in mounting and reduced component count for efficient power supply designs.

AC DC Converters, Offline Switchers Replacement Considerations

Consult official cross-reference guides for compatible alternatives within the TOPSwitch-HX family. Verify pinout compatibility and electrical parameter alignment before substituting with similar models. Ensure any replacement maintains equivalent thermal characteristics and protection feature sets. Review manufacturer recommendations for direct replacements to guarantee functional equivalence in existing designs.