Cost Effective, High Power, η -BalanceTM PWM Controller
                                                         Product：SF1585

一、General Description 

SF1585 is a high performance, cost effective, highly integrated current mode PWM controller for medium to large offline flyback power converter applications.  
In SF1585, PWM switching frequency with shuffling is fixed to 65KHz and is trimmed to tight range. When the   output power    demands   decrease, the IC decreases  switching    frequency based  on the proprietaryη  -BalanceTM control to boost power conversion  efficiency   at  the   light  load   When  the current  set-point  falls  below  a  given  value,  e.g.  the output power demand diminishes, the IC enters into burst mode and provides excellent efficiency without audio noise. 
SF1585  can   achieve “Zero OCP/OPP Recovery Gap” using SiFirst’s proprietary  control  algorithm.  It also has built in proprietary  “Audio Noise Free OCP Compensation”, which can achieve constant power limiting  and  can  achieve  audio  noise   operation  at 
heavy loading when line input is around 90VAC. 
SF1585 integrates functions and protections of Under Voltage  Lockout  (UVLO),  VCC    Over Voltage Protection (OVP),  Cycle-by-cycle   Current   Limiting (OCP),  External  Programmable  Over Temperature Protection (OTP),  All  Pins Floating  Protection,  Over Load  Protection  (OLP), Gate Clamping,  VCC Clamping, Leading Edge Blanking (LEB).  
n SF1585, the OTP and VDD OVP is Latch Plug-off protection.  The  other  protection  functions  are  auto-recovery mode protection. 
SF1585 is available in SOT23-6, DIP-8 packages

二、 Features 

 800mA  Drive Capability, up  To  100W Application with Low System Cost
 Proprietary η  -BalanceTM  Control  to Boost Light Load Efficiency
 Proprietary     “Audio Noise   Free  OCP Compensation
 Proprietary  “Zero  OCP/OPP  Recovery   Gap”Control
 Latch    Plug-off    Protection    with     External Triggering
 Fixed 65KHz Switching Frequency 
 Built-in Soft Start Function
 Pins Floating Protection
 Current Mode Control 
 Built-in Frequency Shuffling
 Built-in Synchronous Slope Compensation
 Cycle-by-Cycle Current Limiting
 Built-in Leading Edge Blanking (LEB)
 Constant Power Limiting
 Audio Noise Free Operation
 VDD UVLO, OVP & Clamp

三、Applications

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

四、Package/Order Information

五、Typical Application

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