*
*Zetex ZHT431 Spice Model v1.0 Last Revised 22/7/2005
*              
*NOTE: This is a simplified model.  Do not rely on this model for 
*validation of circuit stability.  It does not accurately replicate 
*stability boundary conditions with additional load capacitance.  
*Check stability by normal breadboarding techniques.
*
.SUBCKT ZHT431 1 2 3
*Connections  Vz Vref Gnd
*Input current
L2 2 12 2E-9
Rin 12 13 Rmod1 20E6
Cin 12 13 1E-12
D1 13 12 Dmod
D2 12 11 Dmod
*Reference voltage, Voltage dependence
Iref 13 21 2.4985E-3
Rref 21 13 Rmod2 1000
G1 21 13 11 13 1.43E-6
*Gain, time constant & clamp voltage
G2 13 31 12 21 0.004
Rt1 31 13 1E8
Ct1 31 32  800E-12
Rt2 32 13 2000
Ct2 31 33  50E-12
Rt3 33 13 5
D3 31 13 Dmod
D4 13 31 Dmod
*Buffer,Output
G3 13 41 13 31 0.22
L1 1 11 2E-9
Rz 11 42 10
D5 42 41 Dmod
D6 13 41 Dmod
D7 13 11 Dmod
Rx 13 23 0.5
L3 3 23 2E-9
Rq 11 13  Rmod3 74E3
*
.MODEL Rmod1 RES (TC1=2.95E-3 TC2=-5E-7)
.MODEL Rmod2 RES (TC1=8.5E-6 TC2=-3.3E-7)
.MODEL Rmod3 RES (TC1=-2.5E-3 TC2=2E-5)
.MODEL Dmod D IS=1E-14 RS=0.1 BV=22 CJO=0.1E-12
.ENDS  ZHT431
*
*$
*
*                (c)  2005 Zetex Semiconductors plc
*
*   The copyright in these models  and  the designs embodied belong
*   to Zetex Semiconductors plc (" Zetex ").  They  are  supplied
*   free of charge by Zetex for the purpose of research and design
*   and may be used or copied intact  (including this notice)  for
*   that purpose only.  All other rights are reserved. The models
*   are believed accurate but  no condition  or warranty  as to their
*   merchantability or fitness for purpose is given and no liability
*   in respect of any use is accepted by Zetex PLC, its distributors
*   or agents.
*
*   Zetex Semiconductors plc, Zetex Technology Park, Chadderton,
*   Oldham, United Kingdom, OL9 9LL

*
*Zetex ZR431 Spice Model v1.0 Last revision 31/3/2005
*              
*NOTE: This is a simplified model.  Do not rely on this model for 
*validation of circuit stability.  It does not accurately replicate 
*stability boundary conditions with additional load capacitance.  
*Check stability by normal breadboarding techniques.
*
.SUBCKT ZR431 1 2 3
*Connections  Vz Vref Gnd
*Input current
L2 2 12 2E-9
Rin 12 13 Rmod1 20E6
Cin 12 13 1E-12
D1 13 12 Dmod
D2 12 11 Dmod
*Reference voltage, Voltage dependence
Iref 13 21 2.4985E-3
Rref 21 13 Rmod2 1000
G1 21 13 11 13 1.43E-6
*Gain, time constant & clamp voltage
G2 13 31 12 21 0.004
Rt1 31 13 1E8
Ct1 31 32  800E-12
Rt2 32 13 2000
Ct2 31 33  50E-12
Rt3 33 13 5
D3 31 13 Dmod
D4 13 31 Dmod
*Buffer,Output
G3 13 41 13 31 0.22
L1 1 11 2E-9
Rz 11 42 10
D5 42 41 Dmod
D6 13 41 Dmod
D7 13 11 Dmod
Rx 13 23 0.5
L3 3 23 2E-9
Rq 11 13  Rmod3 74E3
*
.MODEL Rmod1 RES (TC1=2.95E-3 TC2=-5E-7)
.MODEL Rmod2 RES (TC1=8.5E-6 TC2=-3.3E-7)
.MODEL Rmod3 RES (TC1=-2.5E-3 TC2=2E-5)
.MODEL Dmod D IS=1E-14 RS=0.1 BV=22 CJO=0.1E-12
.ENDS  ZR431
*
*$
*
*                (c)  2005 Zetex Semiconductors plc
*
*   The copyright in these models  and  the designs embodied belong
*   to Zetex Semiconductors plc (" Zetex ").  They  are  supplied
*   free of charge by Zetex for the purpose of research and design
*   and may be used or copied intact  (including this notice)  for
*   that purpose only.  All other rights are reserved. The models
*   are believed accurate but  no condition  or warranty  as to their
*   merchantability or fitness for purpose is given and no liability
*   in respect of any use is accepted by Zetex PLC, its distributors
*   or agents.
*
*   Zetex Semiconductors plc, Zetex Technology Park, Chadderton,
*   Oldham, United Kingdom, OL9 9LL