LNK305P

AC DC Converters, Offline Switchers Overview

The LNK305P is a LinkSwitch-TN family offline converter designed for cost-effective AC/DC conversion. It integrates a 700V power switch and controller in an 8-pin DIP package. The device supports universal input voltages from 85 VAC to 265 VAC. It delivers up to 175 mA in MDCM or 280 mA in CCM modes. The internal switch operates at a fixed frequency of 66 kHz with a maximum duty cycle of 72%. Operating junction temperature ranges from -40°C to +150°C, with a quiescent supply current of 220 µA.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V power MOSFET and control logic for minimal external component count
• Provides fully integrated auto-restart protection against short-circuit and open-loop faults
• Supports buck, buck-boost, and flyback topologies for versatile design applications

AC DC Converters, Offline Switchers Applications

• Cost-effective linear or capacitor dropper replacements
• Low-power adapter designs requiring high efficiency
• General-purpose off-line power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'P' indicates the PDIP-8 through-hole package variant. Confirm RoHS compliance status via the manufacturer datasheet. Ensure the application circuit matches the required topology (buck/flyback) as the device supports multiple configurations. Check thermal requirements against the specified junction temperature range during integration.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs prioritizing low bill-of-materials cost and simplified assembly. It is suitable for applications requiring isolation or non-isolated outputs within its current limits. Consider the 66 kHz switching frequency when selecting magnetic components. Evaluate the need for auto-restart features versus simpler controllers if system cost is the primary constraint.

AC DC Converters, Offline Switchers Part Context

The LNK305P belongs to the LinkSwitch-TN series by Power Integrations. This family targets ultra-low-cost AC/DC converters. The 'TN' designation signifies a single-chip solution combining power and control. The P suffix typically denotes the plastic dual in-line package format used in this specific part number.

AC DC Converters, Offline Switchers Replacement Considerations

LNK305PN serves as the direct pin-compatible alternative within the same series. Other LinkSwitch-TN variants like LNK302 or LNK304 offer different current capabilities but may require circuit adjustments. Surface-mount equivalents such as LNK305DG-TL provide the same functionality in SO-8C packages.