• Proprietary HV-mWTM to Achieve Less than 50mW Standby Power
  • Proprietary "η-BalanceTM" to boost light load efficiency.
  • Proprietary "zero OCP/OPP recovery gap" control
  • Latch plug-off Protection with External
  • Fixed 65KHz Switching Frequency
  • Frequency Reduction and Burst Mode Control for Energy Saving
  • Built-in soft start function
  • Current mode control
  • Cycle-by-cycle current limiting
  • Built-in leading edge blanking (LEB)
  • Constant power limiting
  • Built-in frequency shuffling
  • Built-in synchronous slope compensation
  • 运用

    Offline AC/DC fly-back converter for
  • AC/DC adapters
  • Open-frame SMPS
  • Set-top box power supplies
  • ATX standby power
      • SF5580 is a high performance, high efficiency,highly integrated current mode PWM controller for medium to large offline flyback converter applications. 
        In SF5580, PWM switching frequency with shuffling is fixed 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. SF5580 also integrates proprietary HV-mWTM technology to achieve less than 50mW standby power. 
        SF5580 can achieve "Zero OCP/OPP Recovery Gap" using SiFirst's proprietary control algorithm. SF5580 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. 
        SF5580 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), Soft Start, Gate Clamping, VCC Clamping. 
        SF5580 is available in SOP8 packages.