SiFirst

SF5920S

PSR

  • Multi-Mode Control
  • Max. Frequency Clamping to Limit Power MOSFET Vds Spike @ Output Short Circuit
  • Low Standby Power under 30mW, Easily to Pass Energy Star EPS2.0
  • Proprietary NC-Cap/PSR TM (Primary side Regulation) Control without External Compensation/Filtering Capacitor Needed
  • ±5% constant current (CC) and constant voltage (CV) regulation at universal AC input
  • Proprietary cable voltage drop compensation in CV mode
  • Compensate for Line voltage variation
  • Built-in soft start and Cycle-by-Cycle Current Limiting
  • Compensate for transformer inductance tolerances
  • Output over voltage protection
  • 运用

  • Battery chargers for cellular phones, cordless phones ,PA D, digital cameras ,etc
  • Replaces linear transformer and RCC SMPS
  • Small power adapter
  • AC/DC LED lighting
      • SF5920S is a high performance, cost efficiency,highly integrated DCM(Discontinuous Conduction Mode)Primary Side Regulation (PSR)controller for Offline LED lighting applications. 
        SF5920S uses Multi Mode Control to improve efficiency and reliability and to decrease audio noise energy @ light loadings. Around the full load, the system operates in PWM+PFM mode, which improve the system reliability. Under light load conditions, the IC operates in PFM mode to achieve excellent regulation and high efficiency, and to achieve less than 70mW standby power. 
        Sf5920S also integrates the function of " Max Frequency Clamping @ Output Short Circuit" to limits power MOSFET Vds spike when output short circuits occurs. 
        SF5920S has built-in proprietary NC-Cap/PSRTM control for CV control, which eliminates external compensation or filtering capacitor, It also has built-in cable drop compensation function, which can provide excellent CV performance. The IC also has built-in soft start function to soften the stress on the MOSFET during power on period. 
        SF5920S 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). 
        SF5920S is available in SOT23-5 packages.