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SD4945
150V NON-ISOLATED DC TO DC CONTROLLER

    SD4945 is DC-DC controller with built-in 150V high-voltage MOSFET used for SMPS.

    SD4945 integrates high-voltage circuit and self-power function for fast startup and low standby power dissipation. It features the frequency reduction function to optimize the conversion efficiency at light load; the soft startup function reduces the device stress to avoid transformer saturation. 

    SD4945 integrates various protections, including VDD undervoltage protection, output overload protection, output overvoltage protection, over temperature protection, etc. Meanwhile, if any protection occurs, the circuit will continue to restart automatically until the system recovers. 


Main feature

  • 18V~150V input voltage

  • Adjustable output voltage

  • High-voltage startup

  • Frequency reduction at light load condition

  • Optimized load regulation

  • Soft startup

  • VDD undervoltage protection

  • Output overvoltage protection

  • Lead edge blanking

  • Output overload protection

  • Over temperature protection


Ordering Information
Product Name Package form Marking Hazardous Substance Control Packing Type Remarks
SD4945 SOP-8-225-1.27 SD4945 Halogen free Tube
SD4945TR SOP-8-225-1.27 SD4945 Halogen free Tape & Reel
Block Diagram

4945.png