SF1539W is a high performance, high efficiency, highly integrated current mode PWM power switch for offline flyback converter applications.  rfZ嘉泰姆

   In SF1539W, PWM switching frequency with shuffling is fixed to 50KHz 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 output power falls below a given value, the IC enters into burst mode and provides excellent efficiency without audio noise.rfZ嘉泰姆

   The IC can achieve "Zero OCP/OPP Recovery Gap" using SiFirst′s proprietary control algorithm. Meanwhile, the OCP/OPP radiation versus universal line input is compensated. rfZ嘉泰姆

   The IC has built-in synchronized slope compensation to prevent sub-harmonic oscillation at high PWM duty output. The IC also has built-in soft start function to soften the stress on the MOSFET during power on period. rfZ嘉泰姆

   SF1539W 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). rfZ嘉泰姆

   SF1539W is available in DIP8 packages.rfZ嘉泰姆