Highly Integrated Current Mode PWM Controller   with Latch

                                                             Product：SF1560

一、General Description

SF1560  is   a  high   performance,  highly   integrated current  mode  PWM  controller  for  medium  to  large offline flyback converter applications.  
In SF1560, the PWM switching is internally trimmed to tight range. To improve EMI performance, the IC integrates   frequency  shuffling   function   to   reduce conduction EMI emission of a power supply. The IC also  integrates   Constant  Power   Limiting  block   to achieve  constant  output  power  limit  from  90VAC  to 264VAC.  
Under  light  load  conditions,  a  green  mode  function can  continuously  decrease  the  switching  frequency. Under zero-load conditions, the power supply enters into  burst   mode  and  provides  excellent   efficiency without  audio   noise  generated.   This  green  mode function enables power supplies to meet international power conservation requirements.  
SF1560 integrates functions and protections of Under Voltage    Lockout    (UVLO),    VDD    Over    Voltage Protection (OVP), Soft Start, External Programmable Over  Temperature  Protection  (OTP),  Cycle-by-cycle Current Limiting (OCP), Over Load Protection (OLP), Pins   Floating    Protection,    RI   Pin    Short-to-GND 
Protection, GATE Clamping, VDD Clamping, Leading Edge Blanking (LEB).  
In SF1560, the OTP and VDD OVP is latch plug-off protection.  The  other  protection  functions  are  auto-recovery mode protection.  
SF1560 is available in SOP-8 and DIP-8 packages

二、 Features 

  Latch  Plug-off  Protection with External Triggering
  Built-in Soft Start Function
  Very Low Startup Current 
  Frequency Reduction and Burst Mode Control for Energy Saving
  Built-in Frequency Shuffling
  Programmable Switching Frequency
  Built-in Synchronous Slope Compensation
  Cycle-by-Cycle Current Limiting
  Pins Floating Protection
  High  Voltage  CMOS  Process  with  Excellent ESD Protection 
  Current Mode Control
  Built-in Leading Edge Blanking (LEB)
  Constant Power Limiting  
  Audio Noise Free Operation
  VDD OVP & Clamp 
  VDD Under Voltage Lockout (UVLO）

三、Applications

Offline AC/DC Flyback Converter for 
AC/DC Power Adaptors 
Open-frame SMPS
Print Power, Scanners, and Motor Drivers 

四、Package/Order Information

五、Typical Application

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