Version 4 SHEET 1 2956 1208 WIRE 160 -304 -496 -304 WIRE 160 -128 160 -304 WIRE 160 16 160 -48 WIRE 160 16 -144 16 WIRE -144 96 -144 16 WIRE -496 128 -496 -304 WIRE 160 208 160 16 WIRE -144 256 -144 176 WIRE 96 256 -144 256 WIRE -144 320 -144 256 WIRE -496 544 -496 208 WIRE -144 544 -144 400 WIRE -144 544 -496 544 WIRE 160 544 160 336 WIRE 160 544 -144 544 WIRE -144 576 -144 544 FLAG -144 576 0 SYMBOL res -160 304 R0 SYMATTR InstName R1 SYMATTR Value 2K SYMBOL res -160 80 R0 SYMATTR InstName R2 SYMATTR Value 2K SYMBOL res 144 -144 R0 SYMATTR InstName R3 SYMATTR Value 1K SYMBOL voltage -496 112 R0 WINDOW 123 0 0 Left 2 WINDOW 39 24 124 Left 2 SYMATTR SpiceLine Rser=0.1 SYMATTR InstName V1 SYMATTR Value 10 SYMBOL ZR431 160 288 M0 SYMATTR InstName ZR431 SYMATTR Prefix X TEXT -528 600 Left 2 !.tran 0 10m 0 startup TEXT 352 -296 Left 2 !*ZETEX ZR431 Spice Model v1.0 Last Revised 31/3/2005\n * \n *NOTE: This is a simplified Model. Do not rely on this Model for \n *validation of circuit stability. It does not accurately replicate \n *stability boundary conditions with additional load capacitance. \n *Check stability by normal breadboarding techniques.\n *\n .SUBCKT ZR431 1 2 3\n *Connections Vz Vref Gnd\n *Input current\n L2 2 12 2E-9\n Rin 12 13 Rmod1 20E6\n Cin 12 13 1E-12\n D1 13 12 Dmod\n D2 12 11 Dmod\n *Reference voltage, Voltage dependence\n Iref 13 21 2.4985E-3\n Rref 21 13 Rmod2 1000\n G1 21 13 11 13 1.43E-6\n *Gain, time constant and clamp voltage\n G2 13 31 12 21 0.004\n Rt1 31 13 1E8\n Ct1 31 32 800E-12\n Rt2 32 13 2000\n Ct2 31 33 50E-12\n Rt3 33 13 5\n D3 31 13 Dmod\n D4 13 31 Dmod\n *Buffer,Output\n G3 13 41 13 31 0.22