TNY278GN-TL

AC DC Converters, Offline Switchers Overview

The TNY278GN-TL is an integrated offline switcher from the TinySwitch-III family, featuring a built-in 700V power MOSFET and flyback controller. It operates at a switching frequency of 132 kHz with a maximum duty cycle of 65%. The device supports an input voltage range of 85 VAC to 265 VAC. It delivers up to 21.5 W in open-frame applications and 28 W at 230 VAC. The package is SMD-8C (SOP-8B).

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V power MOSFET with on-chip oscillator, high-voltage current source, and thermal shutdown.
• Utilizes simple on/off control architecture that eliminates the need for error amplifier compensation.
• Features user-selectable current limit via BP/M pin capacitor to optimize peak or continuous power.
• Includes frequency jittering to reduce EMI filter requirements and cost.

AC DC Converters, Offline Switchers Applications

• Chargers and adapters for mobile phones, PDAs, and portable audio devices
• PC standby power supplies and auxiliary power sources
• Low-power set-top boxes and DVD/PVR decoders
• Power supplies for appliances, industrial systems, and meters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix TL against the manufacturer datasheet to confirm tape-and-reel packaging and moisture sensitivity level. Ensure the ordering part number matches the required SOP-8B footprint. Confirm RoHS compliance status for the specific batch before integration into final assemblies.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring simplified feedback loops without optocouplers. The adjustable current limit allows optimization for either higher peak power or improved efficiency in closed enclosures. Verify that the 132 kHz frequency aligns with transformer design constraints and EMI targets.

AC DC Converters, Offline Switchers Part Context

This part belongs to the TinySwitch-III series, which integrates primary-side regulation capabilities. It serves as a drop-in replacement for previous generations like the TNY178, allowing designers to increase output power without redesigning the magnetic components or circuit topology.

AC DC Converters, Offline Switchers Replacement Considerations

TNY278PN offers identical electrical performance in a DIP-8 through-hole package. TNY277GN-TL provides similar functionality with different power ratings within the same family.