Version 4 SHEET 1 8020 3224 WIRE 704 640 624 640 WIRE 784 640 704 640 WIRE 928 640 864 640 WIRE 1088 640 928 640 WIRE 704 672 704 640 WIRE 928 672 928 640 WIRE 624 720 624 640 WIRE 704 784 704 736 WIRE 816 784 704 784 WIRE 928 784 928 736 WIRE 928 784 816 784 WIRE 1088 784 928 784 WIRE 816 816 816 784 WIRE 176 896 -704 896 WIRE 544 896 176 896 WIRE 624 896 624 784 WIRE 624 896 544 896 WIRE 1088 896 624 896 WIRE 176 912 176 896 WIRE -704 944 -704 896 WIRE -704 944 -768 944 WIRE -640 944 -704 944 WIRE -1232 960 -1232 928 WIRE -768 1008 -768 944 WIRE -640 1008 -640 944 WIRE 176 1008 176 992 WIRE 544 1040 544 896 WIRE -1232 1072 -1232 1040 WIRE -1184 1072 -1184 1056 WIRE -768 1088 -768 1072 WIRE -640 1088 -640 1072 WIRE 176 1104 176 1088 WIRE -1488 1120 -1632 1120 WIRE -1248 1120 -1408 1120 WIRE -1088 1120 -1168 1120 WIRE -976 1120 -1088 1120 WIRE -896 1120 -976 1120 WIRE 544 1136 544 1104 WIRE -1632 1184 -1632 1120 WIRE -896 1184 -896 1120 WIRE -768 1184 -768 1152 WIRE -768 1184 -896 1184 WIRE -1088 1216 -1088 1120 WIRE -976 1216 -976 1120 WIRE 544 1232 544 1200 WIRE -640 1280 -640 1152 WIRE -640 1280 -896 1280 WIRE -32 1312 -528 1312 WIRE 176 1312 176 1184 WIRE 176 1312 -32 1312 WIRE -768 1328 -768 1184 WIRE -640 1328 -640 1280 WIRE 544 1328 544 1296 WIRE -1632 1360 -1632 1264 WIRE -1488 1360 -1632 1360 WIRE -1088 1360 -1088 1280 WIRE -1088 1360 -1408 1360 WIRE -976 1360 -976 1280 WIRE -976 1360 -1088 1360 WIRE -896 1360 -896 1280 WIRE -896 1360 -976 1360 WIRE -32 1360 -32 1312 WIRE -528 1408 -528 1312 WIRE -768 1424 -768 1392 WIRE -640 1424 -640 1392 WIRE 544 1424 544 1392 WIRE -384 1456 -464 1456 WIRE -224 1456 -304 1456 WIRE 320 1504 96 1504 WIRE 176 1536 176 1312 WIRE -768 1552 -768 1488 WIRE -704 1552 -768 1552 WIRE -640 1552 -640 1488 WIRE -640 1552 -704 1552 WIRE -704 1584 -704 1552 WIRE -528 1584 -528 1504 WIRE -528 1584 -704 1584 WIRE -448 1584 -528 1584 WIRE -400 1584 -448 1584 WIRE -272 1584 -320 1584 WIRE -224 1584 -224 1456 WIRE -224 1584 -272 1584 WIRE -32 1584 -32 1424 WIRE -32 1584 -224 1584 WIRE 96 1584 96 1504 WIRE 96 1584 -32 1584 WIRE 160 1584 96 1584 WIRE 320 1584 320 1504 WIRE 320 1584 256 1584 WIRE 544 1584 544 1488 WIRE 544 1584 320 1584 WIRE 784 1584 544 1584 WIRE 1072 1584 784 1584 WIRE 784 1616 784 1584 WIRE -448 1680 -448 1584 WIRE -416 1680 -448 1680 WIRE -272 1680 -272 1584 WIRE -272 1680 -336 1680 FLAG -1184 1056 0 FLAG -1232 928 0 FLAG 816 816 0 FLAG 784 1616 0 SYMBOL voltage -1632 1168 R0 WINDOW 123 0 0 Left 2 WINDOW 39 -131 146 Left 2 WINDOW 3 -167 117 Left 2 SYMATTR SpiceLine Rser=0.05 SYMATTR Value SINE(0 339 50) SYMATTR InstName V6 SYMBOL diode -752 1072 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D24 SYMATTR Value RFN5TF8S SYMBOL sw -1152 1120 R90 SYMATTR InstName S1 SYMBOL voltage -1232 1056 R180 WINDOW 3 84 46 VRight 2 WINDOW 123 0 0 Left 2 WINDOW 39 24 -12 Left 2 SYMATTR Value PWL(0 -1 5000u -1 5001u +1 ) SYMATTR SpiceLine Rser=0.01 SYMATTR InstName V10 SYMBOL zener 560 1104 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D99 SYMATTR Value 1N5378B SYMATTR Description Diode SYMATTR Type diode SYMBOL zener 560 1200 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D100 SYMATTR Value 1N5378B SYMATTR Description Diode SYMATTR Type diode SYMBOL zener 560 1296 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D101 SYMATTR Value 1N5378B SYMATTR Description Diode SYMATTR Type diode SYMBOL zener 560 1392 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D102 SYMATTR Value 1N5378B SYMATTR Description Diode SYMATTR Type diode SYMBOL zener 560 1488 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D103 SYMATTR Value TFZ33B SYMATTR Description Diode SYMATTR Type diode SYMBOL diode -624 1072 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D25 SYMATTR Value RFN5TF8S SYMBOL diode -752 1488 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D27 SYMATTR Value RFN5TF8S SYMBOL res 160 992 R0 SYMATTR InstName R66 SYMATTR Value 470k SYMBOL res 160 896 R0 SYMATTR InstName R67 SYMATTR Value 470k SYMBOL res 160 1088 R0 SYMATTR InstName R68 SYMATTR Value 470k SYMBOL res -320 1664 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R70 SYMATTR Value 0.56 SYMBOL diode -752 1152 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D104 SYMATTR Value RFN5TF8S SYMBOL diode -624 1152 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D105 SYMATTR Value RFN5TF8S SYMBOL diode -752 1392 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D106 SYMATTR Value RFN5TF8S SYMBOL cap -1104 1216 R0 SYMATTR InstName C8 SYMATTR Value 100n SYMATTR SpiceLine Rser=0.09 SYMBOL cap 688 672 R0 SYMATTR InstName C7 SYMATTR Value 220n SYMATTR SpiceLine Rser=0.03 SYMBOL ind 768 656 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L3 SYMATTR Value 470µ SYMATTR SpiceLine Rser=12 SYMBOL cap 912 672 R0 SYMATTR InstName C9 SYMATTR Value 220n SYMATTR SpiceLine Rser=0.03 SYMBOL ind -1504 1136 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 2µ SYMATTR SpiceLine Rser=0.1 SYMBOL ind -1504 1376 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value 2µ SYMATTR SpiceLine Rser=0.1 SYMBOL res -304 1568 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R63 SYMATTR Value 0.56 SYMBOL npn -464 1408 M0 SYMATTR InstName Q5 SYMATTR Value 2N3904 SYMBOL res -400 1472 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R64 SYMATTR Value 1K SYMBOL nmos 256 1536 R90 SYMATTR InstName M15 SYMATTR Value STW11NM80 SYMBOL diode -624 1488 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D26 SYMATTR Value RFN5TF8S SYMBOL diode -624 1392 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D107 SYMATTR Value RFN5TF8S SYMBOL zener -16 1424 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D108 SYMATTR Value TDZ10B SYMATTR Description Diode SYMATTR Type diode SYMBOL cap -992 1216 R0 SYMATTR InstName C1 SYMATTR Value 100n SYMATTR SpiceLine Rser=0.09 SYMBOL diode 640 784 R180 WINDOW 0 24 64 Left 2 WINDOW 3 27 92 Left 2 SYMATTR InstName D1 SYMATTR Value RFN5TF8S TEXT -1056 904 Right 2 !.model sw sw(Ron=1m) TEXT -1736 1016 Left 5 ;MAINS\n230VAC TEXT 216 1680 Left 4 ;This FET is FQB5N90\nin real application. TEXT -112 1824 Left 4 ;Voltage source indicates\nvoltage induced to the FET\ngate. TEXT 712 1112 Left 4 ;This is a 440V TVS in\nthe actual application.\n(1.5SMC440A) TEXT 496 1808 Left 3 ;M15/Q5 is for inrush limtiation\nand partly for mains transient\nvoltage protection. TEXT -1240 688 Left 3 ;S1 switches the prodcuct\nON at the mains peak, which is\nthe worst case for inrush. TEXT -1496 1176 Left 2 ;Stray line\ninductance TEXT -1496 1432 Left 2 ;Stray line\ninductance TEXT 1104 616 Left 4 ;To 0.5W LNK302 based\nBuck converter bias supply TEXT 1128 912 Left 4 ;To 150W non SMPS based\nLED driver. TEXT -1392 464 Left 7 ;Input stage of 150W non-SMPS based linear LED driver TEXT -1224 1432 Left 3 ;These 100n capacitors\nwere added and \nthe problem then started.\nThough there were other \nchanges too. TEXT 120 2088 Left 2 !.tran 0 12m 0 startup LINE Normal 1040 624 1088 640 2 LINE Normal 1040 656 1040 624 2 LINE Normal 1088 640 1040 656 2 LINE Normal 1040 768 1088 784 2 LINE Normal 1040 800 1040 768 2 LINE Normal 1088 784 1040 800 2 LINE Normal 1040 880 1088 896 2 LINE Normal 1040 912 1040 880 2 LINE Normal 1088 896 1040 912 2 LINE Normal 1024 1568 1072 1584 2 LINE Normal 1024 1600 1024 1568 2 LINE Normal 1072 1584 1024 1600 2 CIRCLE Normal 640 1536 400 1008 2 CIRCLE Normal -912 1376 -1152 1152 2