Schematic for the NCP1075SOTGEVB Evaluation Board J1 L1A F1 1 mH 1.5A C1 AC Input T1 0.1uF "X" R1 4.7 ohms 3W R2A C2 0.1uF "X" L1B 3.3M D1-D4 MRA4007 X4 C3 R3 C4 68K 1/2W 1nF 1kV D5 22uF 400V U1 R2B 3.3M 1 mH Primary Ground Plane 4 1 1N4937 4 D7 3 2 J2 C9A C9B + 7,8 1 R4 NCP1075 1K (100 kHz) C5 22uF 25V C7 1nF D6 C6 4.7uF 50V 10 5,6 3 Secondary Ground Plane 2 C11 0.1uF 50V 0.1uF 50V Vout _ 1000uF, 16V C8 1nF "Y1" NOTES: 1. Crossed schematic lines are not connected. 2. R4 value dependent on aux winding turns. 3. R1 is optional inrush limiting resistor. 4. U1 tab (pin 4) and D7 should have heatsinking clad pours. 5. Heavy lines indicate recommended ground plane areas. 6. L1A/L1B are Wurth 7447728102 7. U2 is Vishay SFH6156A-4 optocoupler or similar. C10 MBRS 260T3 MMSD 4148A R5 R6 1K R7 4 3 U2 1 20K U3 2 R8 R10 C12 82.5K 21.5K 0.1 NCP431 R9 21.5K 10 Watt NCP1075 Power Supply with Universal AC Input (Rev 1A) 5/23/2012 -1- www.onsemi.com