Diodes Incorporated

AP4340 (Not Recommended for new design)

Contact Sales

Log in or register to manage email notifications about changes to datasheets or PCNs for this part.


The AP4340 is an output voltage detector for Primary Side Control System. It detects the output voltage and provides a periodical signal when the output voltage is lower than a certain threshold. The periodical signal can be coup°C by the transformer to the primary side and provided as an awakening signal for the main primary side controller. By fast response to secondary side voltage, the AP4340 can effectively improve the transient performance of Primary Side Control System.


  • Fast Detector of Supply Voltages
  • 37kHz Output Pulse
  • No External Components


  • Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3 and Other Portable Apparatus
  • Standby and Auxiliary Power Supplies

Product Specifications

Product Parameters

Related Content

Quality Documentation

Technical Documents

Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2366 2018-09-19 2018-12-19 Qualification of Additional Bill of Materials (BOM), Fab Source, A/T Site and Top Marking Change on Select Product