Version 4 SHEET 1 1460 852 WIRE -176 512 16 512 WIRE -176 16 -144 16 WIRE -144 16 -144 144 WIRE -832 144 -832 176 WIRE -832 64 -832 16 WIRE -832 16 -768 16 WIRE -400 576 -464 576 WIRE -464 464 -400 464 WIRE -544 288 -544 256 WIRE -496 352 -400 352 WIRE -496 400 -496 352 WIRE -400 400 -416 400 WIRE -480 400 -496 400 WIRE -400 496 -640 496 WIRE -496 400 -544 400 WIRE -544 400 -544 368 WIRE -544 -112 -544 -96 WIRE -544 -96 -496 -96 WIRE -496 -96 -496 -144 WIRE -496 -96 -480 -96 WIRE -496 -144 -400 -144 WIRE -400 -96 -416 -96 WIRE -400 -32 -464 -32 WIRE -400 80 -464 80 WIRE -544 -192 -544 -224 WIRE 32 128 32 224 WIRE 32 224 -640 224 WIRE -640 224 -640 496 WIRE 288 -320 -144 -320 WIRE -256 -320 -640 -320 WIRE -640 -320 -640 0 WIRE 208 224 288 224 WIRE -864 -256 -896 -256 WIRE -784 -256 -752 -256 WIRE -784 -224 -752 -224 WIRE -784 -192 -752 -192 WIRE -784 -160 -752 -160 WIRE -784 -128 -752 -128 WIRE -864 -224 -896 -224 WIRE -864 -192 -896 -192 WIRE -864 -160 -896 -160 WIRE -864 -128 -896 -128 WIRE 480 560 480 544 WIRE 480 544 384 544 WIRE 480 640 480 656 WIRE 384 512 512 512 WIRE 48 -64 48 -48 WIRE 48 -128 48 -144 WIRE 144 16 144 32 WIRE 144 -64 144 -80 WIRE 144 -80 80 -80 WIRE -144 144 -80 144 WIRE 16 -96 -80 -96 WIRE -96 -96 -96 112 WIRE -96 112 -80 112 WIRE 80 -112 432 -112 WIRE -80 -96 -96 -96 WIRE 48 480 48 512 WIRE 48 512 112 512 WIRE 16 512 16 480 WIRE 576 -256 576 -224 WIRE 576 -336 576 -384 WIRE 576 -384 768 -384 WIRE 848 -384 960 -384 WIRE 1312 -336 1312 -384 WIRE 1312 -384 1136 -384 WIRE 1312 -256 1312 -224 WIRE 1136 -320 1136 -384 WIRE 1136 -384 1056 -384 WIRE 1136 -256 1136 -224 WIRE 1312 -384 1344 -384 WIRE 1152 32 1152 64 WIRE 1152 176 1152 208 WIRE 1152 -48 1152 -80 WIRE 1152 -80 1184 -80 WIRE 1152 -80 1120 -80 WIRE 1152 64 1120 64 WIRE 1152 64 1152 96 WIRE 960 -80 960 -112 WIRE 960 -192 960 -208 WIRE 960 -320 960 -384 WIRE 960 -384 992 -384 WIRE 960 -208 1024 -208 WIRE 960 -208 960 -224 WIRE 912 -240 864 -240 WIRE 288 224 288 -320 WIRE 32 368 32 272 WIRE 32 224 80 224 WIRE 32 272 80 272 WIRE 112 304 112 320 WIRE -640 0 -400 0 WIRE 272 496 288 496 WIRE 288 496 288 224 WIRE 272 528 320 528 WIRE 160 512 112 512 WIRE 80 224 112 224 WIRE 80 272 112 272 WIRE 352 560 352 576 WIRE 352 496 352 480 WIRE 288 224 448 224 FLAG -832 176 0 FLAG -768 16 Vcc FLAG -544 256 Vcc FLAG -464 464 0 FLAG -464 576 Vcc FLAG -464 -32 0 FLAG -464 80 Vcc FLAG -544 -224 Vcc FLAG 448 224 EXT IOPIN 448 224 Out FLAG -896 -256 EXT FLAG -752 -256 EXT_ FLAG 480 656 0 FLAG 352 576 0 FLAG 512 512 CS IOPIN 512 512 In FLAG 48 -48 0 FLAG 48 -144 Vcc FLAG 144 32 0 FLAG 432 -112 FB IOPIN 432 -112 In FLAG 112 512 CStrip FLAG -896 -224 CStrip FLAG -752 -224 CStrip_ FLAG -80 -96 FBtrip FLAG -896 -192 FBtrip FLAG -752 -192 FBtrip_ FLAG 576 -224 0 FLAG 1312 -224 0 FLAG 1136 -224 0 FLAG 1344 -384 OUT IOPIN 1344 -384 Out FLAG 1152 208 0 FLAG 1152 -80 Vout FLAG 1120 64 FB IOPIN 1120 64 Out FLAG 960 -80 0 FLAG 1024 -208 CS IOPIN 1024 -208 Out FLAG 864 -240 EXT IOPIN 864 -240 In FLAG 960 -384 LX FLAG 112 320 0 FLAG 352 480 Vcc FLAG 80 224 S FLAG 80 272 R SYMBOL 74hct123A -288 288 R0 SYMATTR InstName U1 SYMBOL 74hct123A -288 -208 R0 SYMATTR InstName U2 SYMBOL 74hct32 -32 432 R270 SYMATTR InstName U3 SYMBOL 74hct08 -32 64 R0 SYMATTR InstName U4 SYMBOL voltage -832 48 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5V SYMBOL cap -416 384 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value 10n SYMBOL res -528 272 M0 SYMATTR InstName R1 SYMATTR Value 1.4k SYMBOL cap -416 -112 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value 2.2n SYMBOL res -528 -208 M0 SYMATTR InstName R2 SYMATTR Value 1K SYMBOL 74hct14 -192 -272 R180 SYMATTR InstName U7 SYMBOL dview5 -848 -112 R0 SYMATTR InstName U8 SYMATTR SpiceLine OFFSET=6 GAIN=0.1 SYMBOL Comparators\\LT1720 352 592 R180 SYMATTR InstName U9 SYMBOL voltage 480 544 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value 100mV SYMBOL Comparators\\LT1720 48 -160 M0 SYMATTR InstName U10 SYMBOL voltage 144 -80 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value 1.5V SYMBOL ind 752 -368 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName L1 SYMATTR Value 100µ SYMATTR SpiceLine Ipk=2.0 Rser=0.9 SYMBOL diode 992 -368 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMATTR Value UPSC600 SYMBOL voltage 576 -352 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 12V SYMBOL current 1312 -336 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 28 Left 0 SYMATTR SpiceLine load SYMATTR InstName I1 SYMATTR Value 5mA SYMBOL Misc\\EuropeanPolcap 1120 -320 R0 SYMATTR InstName C3 SYMATTR Value 4.7µ SYMATTR SpiceLine V=300V Rser=0.24 SYMBOL res 1136 -64 R0 SYMATTR InstName R3 SYMATTR Value 1.5Meg SYMBOL res 1136 80 R0 SYMATTR InstName R4 SYMATTR Value 12K SYMBOL nmos 912 -320 R0 SYMATTR InstName M1 SYMATTR Value IRF7401 SYMBOL res 944 -208 R0 SYMATTR InstName R5 SYMATTR Value 50m SYMBOL Digital\\srflop 160 176 R0 SYMATTR InstName A1 SYMATTR SpiceLine Vhigh=4.5 Vlow=0.2 SYMBOL 74hct08 224 576 R180 SYMATTR InstName U11 TEXT 728 488 Left 0 !.tran 1m TEXT 728 408 Left 0 !.include 74hct.lib TEXT 728 376 Left 0 !.include dview.lib TEXT 728 464 Left 0 !.save V(fb) V(cs) V(ext) V(lx) V(out) I(L1) dialogbox TEXT -872 -616 Left 0 ;MAX 1771 SMPS emulation, (c) Nick de Smith, 2004 TEXT -872 -560 Left 0 ;This deck emulates the MAXIM 1771 SMPS chip\nThe example configuration here is for a nixie power supply drawing 5mA\nand running off a 12VDC wall-wart. TEXT -872 -464 Left 0 ;You will need dview.lib and 74hct.lib from the files section of the TEXT -288 -616 Left 0 ;Version: X1.0