LNK304DG-TL

AC DC Converters, Offline Switchers Overview

The LNK304DG-TL is a LinkSwitch-TN series offline switcher IC designed for non-isolated AC-DC power supplies. It integrates a 700V power MOSFET, oscillator, and control circuitry into an SOIC-8 package. The device operates at a switching frequency of 66 kHz with a maximum duty cycle of 69%. It supports an AC input voltage range from 85 V to 265 V. Output current capabilities are 120 mA in discontinuous mode and 170 mA in continuous mode at 230 VAC input. The component functions within a junction temperature range of -40°C to 150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V power MOSFET with high-voltage startup circuitry and simple on/off control logic.
• Includes automatic restart protection that limits output power during short-circuit or open-loop fault conditions.
• Features frequency jittering to reduce electromagnetic interference emissions without requiring external filters.

AC DC Converters, Offline Switchers Applications

• LED lighting drivers
• Non-isolated AC-DC power supplies
• Replacement for linear and capacitive dropper power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'TL' indicates tape and reel packaging when sourcing. Confirm the manufacturer is Power Integrations to ensure genuine components. Check RoHS compliance status against current regulatory requirements. Validate the SOIC-8 package dimensions against PCB footprint specifications before finalizing procurement orders.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring simplified bill of materials and reduced external component count. It is suitable for applications where non-isolated topologies such as buck converters are acceptable. Consider the thermal performance and heat dissipation requirements due to the integrated MOSFET design. Ensure the load current does not exceed the specified 170 mA limit in continuous mode operation.

AC DC Converters, Offline Switchers Part Context

The LNK304DG-TL belongs to the LinkSwitch-TN family, which targets low-power offline applications. This series aims to replace traditional linear regulators and capacitive dropper circuits with higher efficiency solutions. The DG variant specifically denotes the surface-mount SOIC-8 package option, providing flexibility for automated assembly processes compared to through-hole alternatives.

AC DC Converters, Offline Switchers Replacement Considerations

Direct pin-compatible replacements within the same family include LNK304DN-TL and LNK304GN-TL. These variants offer identical electrical characteristics but differ in package type. Verify that any substitute maintains the 700V breakdown voltage and 66 kHz switching frequency specifications required by the original design.

AC DC Converters, Offline Switchers FAQ

How does the LNK304DG-TL regulate output voltage?

It uses a skip-cycle (on/off) control method where the feedback pin current determines whether switching cycles are enabled or inhibited to maintain stable output voltage.

What protection features are included in the LNK304DG-TL?

The device includes over-current protection, thermal shutdown, and an automatic restart circuit that limits power during faults such as short circuits or open loops.