Version 4 SHEET 1 2024 816 WIRE 592 -720 592 -768 WIRE 192 -608 192 -672 WIRE 320 -608 320 -672 WIRE 944 -560 944 -608 WIRE 592 -512 592 -640 WIRE 592 -512 480 -512 WIRE 784 -512 592 -512 WIRE 880 -512 784 -512 WIRE 784 -480 784 -512 WIRE 192 -464 192 -528 WIRE 320 -464 320 -528 WIRE 592 -464 592 -512 WIRE 896 -432 848 -432 WIRE 944 -432 944 -464 WIRE 944 -432 896 -432 WIRE 480 -416 480 -512 WIRE 528 -416 480 -416 WIRE 944 -400 944 -432 WIRE 592 -288 592 -368 WIRE 592 -288 480 -288 WIRE 784 -288 784 -384 WIRE 944 -288 944 -320 WIRE 944 -288 784 -288 WIRE 1040 -288 944 -288 WIRE 1104 -288 1040 -288 WIRE 1296 -288 1104 -288 WIRE 592 -256 592 -288 WIRE 944 -256 944 -288 WIRE 1104 -256 1104 -288 WIRE 1296 -224 1296 -288 WIRE 480 -208 480 -288 WIRE 528 -208 480 -208 WIRE 1472 -208 1344 -208 WIRE 1376 -160 1344 -160 WIRE 1104 -144 1104 -176 WIRE 1376 -128 1376 -160 WIRE 944 -112 944 -176 WIRE 1472 -112 1472 -208 WIRE 400 -64 368 -64 WIRE 592 -64 592 -160 WIRE 592 -64 400 -64 WIRE 880 -64 592 -64 WIRE 1296 -64 1296 -144 WIRE 368 0 368 -64 WIRE 944 64 944 -16 WIRE 1296 80 1296 16 WIRE 1472 80 1472 -32 WIRE 368 144 368 80 FLAG 192 -464 0 FLAG 320 -464 0 FLAG 192 -672 VCC FLAG 320 -672 VCC- FLAG 944 64 VCC- FLAG 944 -608 VCC FLAG 1104 -144 0 FLAG 1040 -288 OUT FLAG 400 -64 IN FLAG 1296 80 0 FLAG 1376 -128 0 FLAG 1472 80 0 FLAG 896 -432 E1 FLAG 368 144 0 FLAG 592 -768 VCC SYMBOL voltage 192 -624 R0 SYMATTR InstName Vps+ SYMATTR Value 23V SYMBOL voltage 320 -624 R0 SYMATTR InstName Vps- SYMATTR Value -23V SYMBOL npn 880 -560 R0 SYMATTR InstName Q5 SYMATTR Value NA51 SYMBOL res 1088 -272 R0 SYMATTR InstName RL SYMATTR Value 100 SYMBOL pnp 880 -16 M180 WINDOW 0 75 26 Left 2 WINDOW 3 71 68 Left 2 SYMATTR InstName Q6 SYMATTR Value NA52 SYMBOL current 592 -720 R0 SYMATTR InstName Ibias1 SYMATTR Value 3mA SYMBOL npn 528 -464 R0 SYMATTR InstName Q3 SYMATTR Value 2N2222 SYMBOL npn 528 -256 R0 SYMATTR InstName Q4 SYMATTR Value 2N2222 SYMBOL res 928 -416 R0 SYMATTR InstName RE1 SYMATTR Value 3 SYMBOL res 928 -272 R0 SYMATTR InstName RE2 SYMATTR Value 3 SYMBOL npn 848 -480 M0 SYMATTR InstName Qprotect SYMATTR Value 2N2222 SYMBOL sw 1296 -128 R180 SYMATTR InstName SW SYMATTR Value MYSW SYMBOL voltage 1296 -80 R0 SYMATTR InstName Vfault SYMATTR Value 0V SYMBOL voltage 1472 -128 R0 SYMATTR InstName Vsw_time SYMATTR Value PULSE(0V 1V 2ms 10u 10u 2ms 4ms) SYMBOL voltage 368 -16 R0 WINDOW 0 -68 19 Left 2 WINDOW 3 -246 114 Left 2 SYMATTR InstName Vin SYMATTR Value SINE(0V 17.7V 1000) TEXT 0 272 Left 2 ;.OP TEXT -56 224 Left 2 ;Spice Directive TEXT -104 312 Left 2 ;.DC Vin -25V +25V 100mV TEXT -104 360 Left 2 !.TRAN 10us 4ms 0ms 10us TEXT 416 272 Left 2 !.model NA51 NPN (Is=10f Xti=3 Eg=1.11 Vaf=100 Bf=100 Ise=0 Ne=1.5 Ikf=0\n+ Nk=.5 Xtb=1.5 Br=1 Isc=0 Nc=2 Ikr=0 Rc=0 Cjc=76.97p Mjc=.2072\n+ Vjc=.75 Fc=.5 Cje=5p Mje=.3333 Vje=.75 Tr=10n Tf=1n Itf=1 Xtf=0\n+ Vtf=10)\n.model NA52 PNP (Is=10f Xti=3 Eg=1.11 Vaf=100 Bf=100 Ise=0 Ne=1.5 Ikf=0\n+ Nk=.5 Xtb=1.5 Br=1 Isc=0 Nc=2 Ikr=0 Rc=0 Cjc=112.6p Mjc=.1875\n+ Vjc=.75 Fc=.5 Cje=5p Mje=.3333 Vje=.75 Tr=10n Tf=1n Itf=1 Xtf=0\n+ Vtf=10) TEXT 728 216 Left 2 ;BJT Transistor Models TEXT 1360 272 Left 2 !.model MYSW SW(Ron=0.001 Roff=10Meg Vt=0.5V Vh=0.1) TEXT 1592 224 Left 2 ;Switch Model TEXT 1352 -352 Left 2 ;Fault Model LINE Normal 1200 -464 1188 192 2