GENERAL DESCRIPTION
SF6771  is a high performance,  highly integrated  QR
(Quasi Resonant  Mode) and Primary Side Regulation 
(PSR)  controller  for  offline  small  power  converter 
applications.
SF6771  has  proprietary  super-QR/PSR
TM
control 
for  high  efficiency  and  low  EMI.  The  IC  can  meet 
EPS  Level  6  energy  standard  easily.  The  IC  can 
support  “No-snubber  &  No-Y”  design  in  5W  charger 
applications.  The  IC  also  has  built-in  cable  drop 
compensation  function,  which  can  provide  excellent
CV performance. 
SF6771 integrates functions and protections of Under 
Voltage  Lockout  (UVLO),  VDD  Over  Voltage 
Protection  (VDD  OVP),  Output  Over  Voltage 
Protection  (Output  OVP),  Soft  Start,  Cycle-by-cycle 
Current Limiting (OCP), Pin  Floating Protection, Gate 
Clamping, VDD Clamping. 
SF6771 is available in SOT23-6 package.
      FEATURES
◆  Easily Meet EPS Level 6

◆  Proprietary  super-QR/PSRTM(QuasiResonant &  Primary Side Regulation) 

    Control for High Efficiency and Low EMI

◆  Support  “No-Snubber  &  “No-Y”  Design  in 5W
     (5V/1A) Charger Applications
◆  Less than 70mW Standby Power
◆  ±5% CC and CV Precision
◆  Proprietary Cable Drop Compensation
◆  Cycle-by-Cycle Current Limiting
◆  Built-in Leading Edge Blanking (LEB)
◆  Pin Floating Protection
◆  Built-in Soft Start
◆  Output Over Voltage Protection
◆  VDD OVP & Clamp
◆  VDD Under Voltage Lockout (UVLO)
     APPLICATIONS
◆  Battery chargers for cellular phones, cordless 
     phones, PDA, digital cameras, etc
◆  Replaces linear transformer and RCC SMPS
◆  AC/DC LED lighting