Schematic for the NCP1070SOTGEVB Evaluation Board J1 L1 F1 1A C1 AC Input T1 1 mH 0.1uF "X" R1 3.3M R3 D1-D4 MRA4007 X4 C2 10uF 400V U1 R2 3.3M Primary Ground Plane 4 1nF 1kV NCP1070 (130 kHz) D5 4 J2 D7 + 8 MBRS 2040LT3 MMSD 4148A R5 R4 1K D6 C5 C4 22uF 25V 5 1N4937 3 2 1 1 C3 68K 1/2W 4.7uF 50V 1nF C6 10 2 C10 R6 4 1. Crossed schematic lines are not connected. 2. R4 value dependent on aux winding source impedance. 3. U1 tab (pin 4) and D7 should have heatsinking clad pours. 4. Heavy lines indicate recommended ground plane areas. 5. L1A/L1B are Coilcraft RFB0810-102L 6. U2 is Vishay SFH6156A-4 optocoupler or similar. 7. Z1 zener value sets Vout. R8 can trim Vout upward. 1200uF 6.2V C9 0.1uF 50V Vout _ Secondary Ground Plane 1nF "Y1" NOTES: C8 0.1uF 50V 7 3 C7 3 U2 Z1 33 1 R8 750 R7 1.5K 2 NCP1070 5 Watt Adapter Power Supply with Universal AC Input (Rev 2) 7/29/2014 -1- www.onsemi.com