TNY277GN

AC DC Converters, Offline Switchers Overview

The TNY277GN is an energy-efficient, off-line switcher from the TinySwitch-III family by Power Integrations. It integrates a 700 V power MOSFET, oscillator, high voltage switched current source, user-selectable current limit, and thermal shutdown circuitry into a single package. The device utilizes an ON/OFF control scheme to provide design flexibility with low system costs and extended power capability. Key electrical parameters include a switching frequency of 132 kHz, a maximum duty cycle of 65%, and a supply current of 365 µA. It supports input voltages from 85 VAC to 265 VAC, delivering up to 18 W output power at 85-265 VAC and 23.5 W peak power at 230 VAC.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700 V power MOSFET with oscillator, high voltage switched current source, and thermal shutdown circuitry for compact design.
• Utilizes ON/OFF control scheme to maintain constant efficiency at extremely light loads without requiring loop compensation.
• Features self-biasing operation that eliminates the need for bias windings or bias components, reducing EMI filter costs through frequency jittering.
• Includes accurate hysteresis thermal shutdown protection with auto-recovery functionality and improved auto-restart for short-circuit conditions.

AC DC Converters, Offline Switchers Applications

• Chargers and adapters for mobile phones, cordless phones, PDAs, digital cameras, and MP3 players.
• PC standby power supplies and auxiliary power sources.
• Power supplies for DVD players, PVRs, and low-power set-top decoders.
• Power systems for household appliances, industrial systems, and metering equipment.

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix (e.g., GN vs PN) against official datasheets to confirm package type and pin configuration. Ensure the selected variant matches the required mounting style and thermal dissipation needs. Cross-reference manufacturer part numbers with distributor catalogs to avoid confusion between similar TinySwitch-III models. Confirm RoHS compliance status if required for specific regional regulations.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring high integration and minimal external component count. It is suitable for designs needing to meet strict global energy efficiency regulations such as CEC and 1W PC standby requirements. Consider the 132 kHz switching frequency and 65% max duty cycle when designing transformer specifications. Evaluate the 700 V breakdown voltage for appropriate isolation requirements in the target application.

AC DC Converters, Offline Switchers Part Context

The TNY277GN belongs to the TinySwitch-III series, which offers enhanced flexibility and extended power range compared to previous generations. This series is designed to reduce system costs while providing robust performance. It competes in the market for highly integrated AC/DC converters where board space and component count are critical constraints.

AC DC Converters, Offline Switchers Replacement Considerations

Direct substitutes within the same family include TNY274, TNY275, and TNY279, depending on the specific power and current limit requirements. Verify pin compatibility and thermal characteristics when swapping between DIP and SMD packages within the series.