LNK501PN

AC DC Converters, Offline Switchers Overview

The LNK501PN is a LinkSwitch family AC/DC converter IC designed for low-cost chargers and adapters. It integrates a 700V power switch, oscillator, high-voltage current source, thermal shutdown, and control logic in an 8-pin DIP-B package. The device supports primary-side regulation with CV/CC output characteristics. It operates from an input voltage range of 85 VAC to 265 VAC. The maximum continuous output power is rated at 3 W under typical conditions. The switching frequency is fixed at 42 kHz. The component functions within a temperature range of -40°C to +150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700V power MOSFET and control circuitry for a compact single-chip solution
• Provides constant voltage and constant current regulation via primary-side sensing
• Includes built-in thermal shutdown and cycle-by-cycle current limiting for system protection

AC DC Converters, Offline Switchers Applications

• Mobile phone and wireless telephone chargers
• PDA and digital camera battery chargers
• MP3 player and portable audio equipment power supplies
• Razor and small appliance adapters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'PN' corresponds to the through-hole DIP-B package variant rather than surface-mount options. Confirm that the manufacturer's datasheet explicitly lists this part number as suitable for new designs, as some older LinkSwitch models may be deprecated. Ensure compliance requirements match the target market regulations.

AC DC Converters, Offline Switchers Selection Notes

Select this component for applications requiring a cost-effective replacement for linear transformers where space and weight reduction are priorities. It is suitable for systems already equipped with EMI filters due to its fixed frequency operation. Consider the 42 kHz switching rate when designing transformer specifications to balance size and efficiency constraints.

AC DC Converters, Offline Switchers Part Context

This device belongs to the LinkSwitch family, which consolidates offline switcher functionality into a single monolithic package. The series targets very low-cost AC-DC conversion needs by eliminating secondary side components. The LNK501 variant specifically offers tighter CC tolerance compared to other family members, optimizing it for precise charging applications.

AC DC Converters, Offline Switchers Replacement Considerations

The LNK500PN serves as a similar alternative within the same family but lacks constant current regulation capabilities. Designers should verify pinout compatibility and thermal performance when substituting between different LinkSwitch variants.