TOP255LN

AC DC Converters, Offline Switchers Overview

The TOP255LN is an integrated off-line switcher from the TOPSwitch-HX family by Power Integrations. It incorporates a 700 V power MOSFET, high voltage switched current source, PWM control, oscillator, thermal shutdown circuit, and fault protection onto a monolithic device. The component supports universal AC input voltages ranging from 85 VAC to 265 VAC. It delivers up to 57 W of output power with universal input and up to 81 W at 230 VAC. The switching frequency operates at 66 kHz, with a maximum duty cycle of 83% and a breakdown voltage of 700 V.

AC DC Converters, Offline Switchers Feature Summary

• Multi-mode operation maximizes efficiency across all load conditions
• User programmable output overvoltage protection allows latching or non-latching shutdown
• Line undervoltage detection prevents turn-off glitches during input fluctuations
• Frequency jittering reduces electromagnetic interference filter costs

AC DC Converters, Offline Switchers Applications

• Universal input AC-DC converters
• Adapters where space is limited
• Monitor applications requiring low height profiles
• General purpose power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'LN' against official manufacturer documentation to confirm package type and pinout configuration. Ensure compatibility with the intended PCB layout and thermal management requirements. Confirm RoHS compliance status through current datasheets as manufacturing processes may evolve. Cross-reference ordering information directly with authorized distributors to avoid counterfeit components.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring high power density without external heat sinks for lower wattage outputs. Consider the extended creepage distance between the DRAIN pin and adjacent pins for improved field reliability in high voltage applications. Evaluate the system cost benefits derived from reduced transformer size and simplified mounting using clips for specific packages within the family.

AC DC Converters, Offline Switchers Part Context

This part belongs to the TOPSwitch-HX family, which represents enhanced EcoSmart technology. The series integrates advanced features such as optimized line feed-forward for ripple rejection and accurate hysteretic thermal shutdown. These devices are designed to lower system costs while providing higher design flexibility compared to previous generations of integrated switchers.

AC DC Converters, Offline Switchers Replacement Considerations

Compatible substitutes within the same family include TOP254LN and TOP256LN. Verify pin compatibility and power rating differences before substitution. TOP255EG and TOP255EN share similar functional characteristics but may differ in packaging specifications.