About PTC(Positive Temperature Coefficient)SPICE MODEL

1. About SPICE MODEL of
PTC(Positive Temperature Coefficient)
05APR2015
Tsuyoshi Horigome
tsuyoshi.horigome@gmail.com
1Copyright (C) Tsuyoshi Horigome 2015

2. SPICE MODEL of
PTC
SPICE MODEL for
Transient
Analysis
SPICE Model for
Thermal Analysis
PTC has 2 type Spice Model
2Copyright (C) Tsuyoshi Horigome 2015

3. SPICE MODEL for Transient Analysis
Changing the temperature by a time axis in optional transient analysis,
and when analyzing the influence by which PTC gives it to a circuit.
There are a lot of cases used by this case.
TEMP1
TEMP2
1
2
U1
3Copyright (C) Tsuyoshi Horigome 2015
VPWL
CSV Data(Excel Data)

4. 0
TEMP1
TEMP2
1
2
U1
0
VTEMP
0Vdc
RL
1MEG
It's possible to make a profile of the temperature reflected in Voltage
Source of VTEMP. A profile of the temperature in time can be input by
CSV data.
4Copyright (C) Tsuyoshi Horigome 2015
SPICE MODEL for Transient Analysis

5. 5Copyright (C) Tsuyoshi Horigome 2015
SPICE MODEL for Transient Analysis

6. SPICE Model for Thermal Analysis
The SPICE model using Thermal Analysis is quite special. Temperature setting is
established by a simulator of SPICE.
V1
1V
0
IN
SENSE
0
U1
SMD1812P050TF-30
12
6Copyright (C) Tsuyoshi Horigome 2015

7. 1.00E-01
1.00E+00
1.00E+01
1.00E+02
1.00E+03
1.00E+04
1.00E+05
1.00E+06
0 40 80 120 160 200
Resistance[Ω]
Temperature [ C]
Measurement
Simulation
7Copyright (C) Tsuyoshi Horigome 2015
SPICE Model for Thermal Analysis