Version 4 SHEET 1 2848 1752 WIRE 1200 1136 1088 1136 WIRE 1632 1136 1200 1136 WIRE 1824 1136 1632 1136 WIRE 1904 1136 1824 1136 WIRE 1088 1168 1088 1136 WIRE 1200 1168 1200 1136 WIRE 1632 1184 1632 1136 WIRE 1904 1184 1904 1136 WIRE 1408 1232 1312 1232 WIRE 1472 1232 1408 1232 WIRE 1824 1232 1824 1136 WIRE 1824 1232 1792 1232 WIRE 1312 1248 1312 1232 WIRE 1088 1280 1088 1248 WIRE 1200 1280 1200 1232 WIRE 1408 1328 1408 1232 WIRE 1472 1328 1408 1328 WIRE 1824 1328 1792 1328 WIRE 1904 1328 1904 1264 WIRE 2016 1328 1904 1328 WIRE 2144 1328 2080 1328 WIRE 2288 1328 2144 1328 WIRE 2432 1328 2352 1328 WIRE 2592 1328 2432 1328 WIRE 2736 1328 2592 1328 WIRE 1312 1344 1312 1312 WIRE 1904 1344 1904 1328 WIRE 2144 1360 2144 1328 WIRE 2736 1360 2736 1328 WIRE 2432 1376 2432 1328 WIRE 2592 1376 2592 1328 WIRE 1216 1424 1088 1424 WIRE 1392 1424 1216 1424 WIRE 1472 1424 1392 1424 WIRE 1856 1424 1792 1424 WIRE 1216 1440 1216 1424 WIRE 2144 1472 2144 1440 WIRE 1088 1488 1088 1424 WIRE 1824 1488 1824 1328 WIRE 1904 1488 1904 1440 WIRE 1904 1488 1824 1488 WIRE 2592 1504 2592 1440 WIRE 2736 1504 2736 1440 WIRE 1472 1520 1360 1520 WIRE 2432 1520 2432 1456 WIRE 2432 1520 1792 1520 WIRE 1216 1536 1216 1520 WIRE 1360 1536 1360 1520 WIRE 2432 1536 2432 1520 WIRE 1904 1552 1904 1488 WIRE 2432 1632 2432 1616 WIRE 1088 1648 1088 1552 WIRE 1216 1648 1216 1600 WIRE 1360 1648 1360 1616 WIRE 1632 1648 1632 1568 WIRE 1904 1648 1904 1632 FLAG 1904 1648 0 FLAG 1360 1648 0 FLAG 2432 1632 0 FLAG 1632 1648 0 FLAG 2592 1504 0 FLAG 1088 1648 0 FLAG 1216 1648 0 FLAG 2736 1504 0 FLAG 1088 1280 0 FLAG 1312 1344 0 FLAG 1088 1136 IN FLAG 1392 1424 VC FLAG 2736 1328 OUT FLAG 1200 1280 0 FLAG 2144 1472 0 SYMBOL NMOS 1856 1344 R0 SYMATTR InstName M1 SYMATTR Value IRF7811 SYMBOL RES 1344 1520 R0 SYMATTR InstName R1 SYMATTR Value 80.6K SYMBOL res 2416 1520 R0 SYMATTR InstName R2 SYMATTR Value 11.3K SYMBOL res 2416 1360 R0 SYMATTR InstName R3 SYMATTR Value 34.8K SYMBOL ind2 1888 1168 R0 SYMATTR InstName L1 SYMATTR Value 10µ SYMATTR SpiceLine Rser=.05 Rpar=469.193 SYMBOL schottky 2288 1344 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMATTR Value MBR735 SYMBOL polcap 2576 1376 R0 SYMATTR InstName C1 SYMATTR Value 150µ SYMATTR SpiceLine Rser=.05 SYMBOL res 1200 1424 R0 SYMATTR InstName R4 SYMATTR Value 5K SYMBOL cap 1200 1536 R0 SYMATTR InstName C2 SYMATTR Value 6800p SYMBOL cap 1072 1488 R0 SYMATTR InstName C3 SYMATTR Value 50p SYMBOL POWERPRODUCTS\\LTC1871 1632 1376 R0 SYMATTR InstName U1 SYMBOL VOLTAGE 1088 1152 R0 WINDOW 123 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 4 SYMATTR SpiceLine Rser=0.01 SYMBOL polcap 1296 1248 R0 SYMATTR InstName C4 SYMATTR Value 4.7µ SYMBOL polcap 1184 1168 R0 SYMATTR InstName C5 SYMATTR Value 100µ SYMATTR SpiceLine Rser=.05 SYMBOL CURRENT 2736 1360 R0 WINDOW 123 0 0 Left 0 SYMATTR InstName I1 SYMATTR Value 500mA SYMATTR SpiceLine load SYMBOL ind2 2128 1456 M180 WINDOW 0 36 80 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName L2 SYMATTR Value 10µ SYMATTR SpiceLine Rser=.05 Rpar=469.193 SYMBOL polcap 2016 1344 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C6 SYMATTR Value 47µ SYMATTR SpiceLine Rser=.05 SYMBOL res 1888 1536 R0 SYMATTR InstName R5 SYMATTR Value .05 TEXT 2024 1224 Left 0 !K1 L1 L2 1 TEXT 1120 1024 Left 0 !.tran 5m TEXT 1120 1056 Left 0 ;.tran 5m steady TEXT 1608 1016 Left 0 ;SEPIC DC/DC Converter Running With 300kHz TEXT 1320 1056 Left 0 ;<-- Use this comamnd for the efficiency calculation TEXT 1928 1056 Left 0 ;Plot the sum I(L1)+I(L2) to see the total magnetizing current for the core.