le with the current require- z Adaptor and Battery Charger ATX Standby Power Set-Top Box (STB) DVD and CD(R) TV/Monitor Standby Power PC Peripherals ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. Marking Information R7731AGE IDP=W IDP= : Product Code W : Date Code R7731AGE RichTek R7731A GNYMDNN R7731A-10 August 2011 R7731AGN : Product Number YMDNN : Date Code www.richtek.com 1 R7731A Pin Configurations (TOP VIEW) GND COMP NC 8 GATE VDD CS 6 5 4 2 3 GND COMP RT 7 6 5 2 3 4 NC CS GATE VDD SOT-23-6 RT DIP-8 Typical Application Circuit VO+ AC Mains (90V to 265V) VO- RT VDD * R7731A COMP GATE GND CS * : See Application Information Functional Pin Description Pin No. Pin Name Pin Function SOT-23-6 DIP8 1 8 GND Ground. 2 7 COMP Comparator Input. By connecting an opto-coupler to this pin, the peak current set point is adjusted accordingly to the output power requirement. 3 5 RT Set the switching frequency by connecting a resistor to GND. 4 4 CS Primary