SF1531S is a high performance, low cost, highly integrated current mode PWM controller  for offline flyback converter applications. nGW嘉泰姆

   PWM switching frequency with shuffling is externally programmable, which can  reduce conduction EMI emission of a power supply. When the output power demands  decrease, the IC automatically decreases switching frequency for high power  conversion efficiency. 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.nGW嘉泰姆

   SF1531S can achieve “Zero OCP/OPP Recovery Gap” using SiFirst’s proprietary  control algorithm. Meanwhile, the OCP/OPP variation versus universal line input  is compensated. nGW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.nGW嘉泰姆

   SF1531S 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). nGW嘉泰姆

   SF1531S is available in SOT23-6, DIP-8 packages.nGW嘉泰姆