Version 4 SHEET 1 880 680 WIRE 352 -128 64 -128 WIRE 352 -96 352 -128 WIRE 352 0 352 -16 WIRE 352 0 224 0 WIRE 224 32 224 0 WIRE 352 64 352 0 WIRE 432 64 352 64 WIRE 64 80 64 -128 WIRE 352 112 352 64 WIRE 224 144 224 112 WIRE 320 144 224 144 WIRE 224 192 224 144 WIRE 64 304 64 160 WIRE 224 304 224 272 WIRE 224 304 64 304 WIRE 352 304 352 176 WIRE 352 304 224 304 WIRE 64 320 64 304 FLAG 64 320 0 FLAG 432 64 vref SYMBOL voltage 64 64 R0 WINDOW 3 -183 129 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PWL(0 22 1 26) SYMATTR InstName V1 SYMBOL tl431 336 112 R0 SYMATTR InstName U1 SYMBOL res 336 -112 R0 SYMATTR InstName R1 SYMATTR Value 2k2 SYMBOL res 208 16 R0 SYMATTR InstName R2 SYMATTR Value 18k SYMBOL res 208 176 R0 SYMATTR InstName R3 SYMATTR Value 5k972 TEXT 32 344 Left 2 !.tran 0 1 1m TEXT 248 344 Left 2 !.include tl431.mod TEXT -176 136 Left 2 !.step temp 0 50 5