• SF5533 is a high performance, high efficiency, low cost, highly integrated current mode PWM controller  for offline flyback converter applications. vXD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 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.vXD嘉泰姆




•    SF5533 can achieve "Zero OCP/OPP Recovery Gap" using SiFirst's proprietary control algorithm. Meanwhile, the OCP/OPP variation versus universal line input is compensated. 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.  vXD嘉泰姆




•    SF5533 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). vXD嘉泰姆




•    SF5533 is available in SOT23-6, DIP-8 packages.vXD嘉泰姆

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