Version 4 SHEET 1 2284 2244 WIRE 1504 1232 1008 1232 WIRE 1008 1280 1008 1232 WIRE 1408 1296 1392 1296 WIRE 1504 1296 1504 1232 WIRE 1504 1296 1488 1296 WIRE 1520 1296 1504 1296 WIRE 1632 1296 1600 1296 WIRE 1392 1376 1392 1296 WIRE 1472 1376 1392 1376 WIRE 1632 1376 1632 1296 WIRE 1632 1376 1536 1376 WIRE 1008 1408 1008 1360 WIRE 1040 1408 1008 1408 WIRE 1392 1424 1392 1376 WIRE 1792 1424 1392 1424 WIRE 1632 1456 1632 1376 WIRE 1632 1456 1232 1456 WIRE 1008 1472 1008 1408 WIRE 1232 1472 1232 1456 WIRE 1792 1472 1792 1424 WIRE 1392 1520 1392 1424 WIRE 1632 1520 1632 1456 WIRE 1120 1600 1120 1408 WIRE 1136 1600 1120 1600 WIRE 1232 1600 1232 1536 WIRE 1232 1600 1216 1600 WIRE 1248 1600 1232 1600 WIRE 1344 1600 1328 1600 WIRE 1696 1600 1680 1600 WIRE 1792 1600 1792 1536 WIRE 1792 1600 1776 1600 WIRE 1824 1600 1792 1600 WIRE 1008 1616 1008 1552 WIRE 1232 1616 1232 1600 WIRE 1792 1616 1792 1600 WIRE 1392 1632 1392 1616 WIRE 1504 1632 1392 1632 WIRE 1632 1632 1632 1616 WIRE 1632 1632 1504 1632 WIRE 1120 1648 1120 1600 WIRE 1168 1648 1120 1648 WIRE 1344 1664 1344 1600 WIRE 1504 1664 1504 1632 WIRE 1680 1664 1680 1600 WIRE 1120 1680 1120 1648 WIRE 1232 1696 1232 1680 WIRE 1792 1696 1792 1680 WIRE 1344 1744 1344 1728 WIRE 1680 1744 1680 1728 WIRE 1120 1760 1120 1744 WIRE 1168 1776 1168 1648 WIRE 1904 1776 1904 1600 WIRE 1904 1776 1168 1776 FLAG 1008 1616 0 FLAG 1504 1664 0 FLAG 1232 1696 0 FLAG 1792 1696 0 FLAG 1120 1760 0 FLAG 1680 1744 0 FLAG 1344 1744 0 SYMBOL ind2 1392 1312 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 4 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 0.5µ SYMATTR SpiceLine Rser=10m SYMBOL ind2 1504 1312 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 4 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value 0.5µ SYMATTR SpiceLine Rser=10m SYMBOL cap 1536 1360 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 660n SYMATTR SpiceLine Rser=2m SYMBOL VOLTAGE 1008 1456 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 15 SYMBOL nmos 1344 1520 R0 SYMATTR InstName M1 SYMATTR Value IRF530 SYMBOL nmos 1680 1520 M0 SYMATTR InstName M2 SYMATTR Value IRF530 SYMBOL ind 992 1264 R0 SYMATTR InstName L3 SYMATTR Value 64µ SYMBOL res 1792 1584 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 47 SYMBOL res 1344 1584 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 47 SYMBOL cap 1216 1616 R0 SYMATTR InstName C2 SYMATTR Value 22n SYMBOL cap 1776 1616 R0 SYMATTR InstName C3 SYMATTR Value 22n SYMBOL cap 1776 1472 R0 SYMATTR InstName C5 SYMATTR Value 10n SYMBOL cap 1216 1472 R0 SYMATTR InstName C4 SYMATTR Value 10n SYMBOL res 1920 1584 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 100k SYMBOL res 1232 1584 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 100k SYMBOL zener 1136 1744 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D1 SYMATTR Value 1N750 SYMATTR Description Diode SYMATTR Type diode SYMBOL res 1136 1392 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL zener 1360 1728 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D2 SYMATTR Value BZX84C15L SYMATTR Description Diode SYMATTR Type diode SYMBOL zener 1696 1728 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D3 SYMATTR Value BZX84C15L SYMATTR Description Diode SYMATTR Type diode TEXT 1008 1208 Left 2 !.tran 1m startup TEXT 1368 1208 Left 2 !K1 L1 L2 1 TEXT 976 1832 Left 2 ;source: \nHigh currents through L1, L2 and C1!\nL1+L2: helical coil with center tap, litz wire preferred\nC1: several Wima MKP10 or FKP1 capacitors in parallel, watch current rating\nL3: toroid choke, watch dc current rating\nM1, M2: IRF540N\nD1: 4-5 V zener diode for MOSFET dc bias\nD2, D3: 12-18 V zener diode for gate protection