TOP245YN

AC DC Converters, Offline Switchers Overview

The TOP245YN is an integrated off-line switcher from the TOPSwitch-GX family, combining a high-voltage power MOSFET with a PWM controller and protection circuitry. It supports flyback topologies with a switching frequency of 132 kHz and a maximum duty cycle of 83%. The device operates within an input voltage range of 85 VAC to 265 VAC, delivering up to 60 W in universal input or 85 W at 230 VAC. Key electrical parameters include a supply current of 1.6 mA, a breakdown voltage of 700 V, and an operating temperature range from -40°C to +150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates soft-start functionality to minimize stress and output voltage overshoot during startup.
• Features externally programmable accurate current limit for precise power management.
• Includes line overvoltage shutdown to extend surge limits and improve reliability.
• Provides hysteretic thermal shutdown for automatic fault recovery without manual reset.

AC DC Converters, Offline Switchers Applications

• Universal input AC/DC adapters
• Open-frame power supplies
• Battery chargers
• Industrial control systems

AC DC Converters, Offline Switchers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for specific marking changes documented in Product Change Notices. Ensure the TO-220-7C package matches design requirements. Review datasheet revisions for any updates to electrical characteristics or recommended operating conditions prior to final procurement.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring extended power capabilities up to 85 W with minimal external components. The integrated features reduce system cost by eliminating the need for separate controllers or complex protection circuits. Consider the TO-220-7C package for through-hole mounting applications where thermal dissipation is managed via heatsinking or board layout.

AC DC Converters, Offline Switchers Part Context

The TOP245YN belongs to the TOPSwitch-GX series, which extends the power range of previous generations while maintaining low standby power consumption. This series integrates advanced control algorithms to optimize efficiency across varying load conditions. The Y suffix denotes the TO-220 package variant, providing robust mechanical stability for industrial and high-power consumer applications.

AC DC Converters, Offline Switchers Replacement Considerations

TOP245Y

AC DC Converters, Offline Switchers FAQ

How does the TOP245YN handle thermal faults?

It utilizes hysteretic thermal shutdown, which automatically recovers operation once the junction temperature decreases, preventing PC board overheating.

What is the purpose of the line feed-forward feature?

Line feed-forward reduces the maximum duty cycle (DC MAX) at high line voltages, rejecting line ripple and improving regulation stability.