• Fixed 65KHz Switching Frequency
  • Proprietary "η-BalanceTM" 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
  • 800mA Drive Capability up to 100W Application with Low System Cost
  • Programmable switching frequency
  • Current Mode Control and Pins floating protection
  • Built-in Frequency Shuffling and Built-in soft start function
  • Cycle-by-Cycle Current Limiting
  • Built-in Leading Edge Blanking (LEB)
  • Constant Power Limiting
  • Audio Noise Free Operation
  • 运用

    Offline AC/DC Flyback Converter for
  • AC/DC Adaptors
  • Open-frame SMPS
  • Set-Top Box Power Supplies
  • ATX Standby Power
      • SF1585 is a high performance, cost efficiency, high efficiency, low cost, highly integrated current mode PWM controller for offline flyback converter applications. 
        In SF1585,PWM switching frequency with shuffling is fixd to 65KHz and is trimmed to tight range. When the output power demands decrease, the IC automatically decreases switching frequency based on the proprietary η-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 Niose 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), All Pins Floating Protection, Over Load Protection (OLP), RT Pin Short-to-GND Protection, Gate Clamping, VCC Clamping, Leading Edge Blanking (LEB). 
        SF1585 is available in SOT23-6, DIP-8 packages.