Schematic for the NCP1129DIPGEVB Evaluation Board R2 5.6K F1 C1 4.7 ohms 3W L1B R5 1M D1-D4 MRA4007 X4 R8 C2 C3 0.1uF "X2" 47uF 400V R7 3M 0.5W NU 7 2 Vcc R3 5.6K 1 Is R6 C5 510K 5 U1 3 Z1 25V C6 8 NCP1129 FB 820uH 10nF 1kV 47K 1W D5 10 D 6 C7 1nF R13 1nF 33 J2 C9A C9B C9C 8 S 2.4K R9A/B 0.5W 22uF C8 D6 D7 0 ohms MMSD 1N4937 4148A Vout _ 1nF "Y1" R12 9 R17 R14 7 1K (12V) 240 (5V) 2.0 U3 R15 U2 1. 2. 3. 4. 5. 6. 7. 8. C11 0.1uF 50V (TO-220) C14 0.1 1 1000uF, 16V (12Vout) 3300uF, 6.3V (5Vout) C13 Gnd 4 NOTES: + D8 1 Ohm x 2 R11 C10 5 R10 100pF 0.1uF "X2" R1 R4 1M 6 1N4937 820uH 4.7uF 2A 250Vac AC Input T1 C4 L1A 0.5W J1 4 1 3 2 15K R16 C12 20K 39K (12V) 10K (5V) 0.1 NCP431 R18 10K Crossed lines on schematic are NOT connected. U2 is NEC PS2561L-1 or equivalent optocoupler (CTR > 50%). R1 is for inrush limiting - use carbon comp or wire wound. L1A/L1B are Wurth # 7447728215 inductors (820 uH, 500mA). Output caps (C9A/B/C) are radial lead, low impedance types (UCC LXV series or similar). R11 is for Vcc trimming (< 28Vmax), typically zero ohms. R9A/B sets max output current. Heavy schematic lines indicate recommended ground plane areas. 15/20 Watt NCP1126/1129 Power Supply with Universal AC Input (Rev 2) 9/4/2013 -1- www.onsemi.com