DAK-85: 2W, 6V @ 330mA, 90 ~ 265 VAC

This document describes a universal input charger power supply designed to replace linear transformer based chargers/adapters in low power applications. The power supply utilizes a LinkSwitch-LP IC, LNK564P. The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.

The LinkSwitch-LP IC has been developed to replace linear transformers in low power charger applications. The integrated 700 V switching MOSFET and ON/OFF control function achieve very high efficiency operation under all load conditions with simple bias winding voltage feedback. No-load and operating efficiency performance exceeds all international energy efficiency standards either present or proposed in the future.

Thermal shutdown is included as a minimum requirement to match the safety thermal cut out (thermal fuse) in linear transformers. The IC’s intelligent thermal shutdown feature is specified with a very tight tolerance (142 °C +/-5%) and includes a hysteretic auto recovery feature to automatically restart the power supply while maintaining the average pcb temperature at safe levels under all conditions. This auto-recovery is designed to eliminate the potential for field returns since the power supply automatically recovers when ambient temperatures return to the normal operating range.