This application note describes a constant current power module with high integration for full range input voltage  from 180VAC ~ 264VAC by adopting the SQ9920. Based  on buck topology, the SQ9920 is able to achieve high  current accuracy for lighting application. This application  provides multiple advanced fault protections to enhance  the systems safety, including natural open loop  protection, VDD under-voltage lockout and thermal shut  down. All protections have auto-restart mechanisms.  Schematics, PCB Gerber, BOM, as well as typical  performance are covered in details by this application  note. A complete application circuit is depicted in Figure 4, which can work on input voltage range from 180VAC ~  264VAC.  

Key Features 

 Input from 180VAC/50Hz to 264VAC/50Hz, LED DC 80V/30mA output 

 Fixed frequency 65kHz buck converter and maximum efficiency > 81%  

 Peak current mode control and LED output current variation within ±3%  

 Built-in EMI solution (optional) 

 Minimum Bill of Material (BOM) for as few as 7 or 9(with EMI) external components 

 Dimension : 26mm× 15mm× 10mm

 Typical application : GU10 lighting