This document contains a device modeling report for a shunt regulator component. It includes: 1) The SPICE model for the AN1431T shunt regulator from Panasonic, including component values and descriptions. 2) Simulation results showing the reference voltage is accurately modeled as 2.5V under different load currents. 3) The dynamic impedance is also closely matched between simulation and measurement. 4) Graphs of the output characteristic and internal diode characteristics are provided for reference.

1. All Rights Reserved Copyright (c) Bee Technologies Inc. 2004
Device Modeling Report
Bee Technologies Inc.
COMPONENTS: SHUNT REGULATOR
PART NUMBER: AN1431T
MANUFACTURER: PANASONIC

2. All Rights Reserved Copyright (c) Bee Technologies Inc. 2004
A
REF
KU1
AN1431T
SPICE MODEL
*$
*PART NUMBER: AN1431T
*MANUFACTURER: PANASONIC
*VREF=2.5V, IREF=2uA
* All Rights Reserved Copyright (c) Bee Technologies Inc. 2004
.SUBCKT an1431t REF A K
V1 6 7 DC 0.865V
I1 A 4 1mA
G1 A 4 VALUE={I(V1)*0.0792E-3}
R1 REF A 6.25MEG
R2 4 A 2.5K
R3 7 5 0.2
D1 K 6 DSR1
D2 A K DSR3
D3 A 7 DSR2
E1 5 A VALUE ={1000*(V(4,A)-V(REF,A))}
.MODEL DSR1 D(RS=1.1 N=1.25 ISR=0 TT=0)
.MODEL DSR2 D(RS=1E-6 ISR=0 TT=0)
.MODEL DSR3 D(IS=1.6630E-12 N=1.1658 RS=1.0000E-6 IKF=3.1836E-3
+ CJO=75.009E-12 M=.29551 VJ=.45373 ISR=0 BV=52 IBV=100.00E-6
+ TT=0)
.ENDS
*$

3. All Rights Reserved Copyright (c) Bee Technologies Inc. 2004
Pspice
model
parameter
Model description
IS Saturation Current
N Emission Coefficient
RS Series Resistance
IKF High-injection Knee Current
CJO Zero-bias Junction Capacitance
M Junction Grading Coefficient
VJ Junction Potential
ISR Recombination Current Saturation Value
BV Reverse Breakdown Voltage(a positive value)
IBV Reverse Breakdown Current(a positive value)
TT Transit Time

4. All Rights Reserved Copyright (c) Bee Technologies Inc. 2004
VREF(Reference Voltage)
Circuit simulation result
Evaluation circuit
Simulation Result/ VREF (V) : Condition VKA= VREF, Ik=10mA
Measurement Simulation Error
VREF(V) 2.5 V 2.4996 V -0.016 %
I3
1mAdc
A
REF
KU3
AN1431T
100
0.1u
0
R5
1k

5. All Rights Reserved Copyright (c) Bee Technologies Inc. 2004
ZKA (Dynamic Impedance)
Circuit simulation result
Evaluation circuit
Simulation Result/ |ZKA|(ohm) : Condition VKA= VREF, Ik=1~100mA
Measurement Simulation Error
|ZKA| 0.2 ohm 0.201 ohm 0.5 %
R4
1k
100
0.1u
I2
1mAdc A
REF
KU1
AN1431T
0

6. All Rights Reserved Copyright (c) Bee Technologies Inc. 2004
Output Characteristic
Circuit simulation result
Measurement

7. All Rights Reserved Copyright (c) Bee Technologies Inc. 2004
Reference
I-V Characteristic (D2)
Reverse Characteristic (Breakdown Characteristic) (D2)