Si9945AEY-RC

Si9945AEY_RC
Vishay Siliconix
R-C Thermal Model Parameters
DESCRIPTION
The parametric values in the R-C thermal model have
been derived using curve-fitting techniques. These
techniques are described in "A Simple Method of
Generating Thermal Models for a Power MOSFET"[1].
When implemented in P-Spice, these values have
matching characteristic curves to the Single Pulse
Transient Thermal Impedance curves for the
MOSFET.
R-C values for the electrical circuit in the Foster/Tank
and Cauer/Filter configurations are included.
Note:
For a detailed explanation of implementing these values in
P-SPICE, refer to Application Note AN609 Thermal Simulations Of
Power MOSFETs on P-SPICE Platform.
R-C THERMAL MODEL FOR TANK CONFIGURATION
R-C VALUES FOR TANK CONFIGURATION
Thermal Resistance (°C/W)
Junction to
Ambient
Case
Foot
RT1
5.2636
N/A
11.2331
RT2
32.2775
N/A
7.2014
RT3
18.4920
N/A
502.7000 m
RT4
48.9669
N/A
19.0628
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CT1
1.4191 m
N/A
9.2099 m
CT2
56.5003 m
N/A
1.3529 m
CT3
11.9074 m
N/A
8.2212
CT4
1.7733
N/A
54.6991 m
This document is intended as a SPICE modeling guideline and does not constitute a commercial product data sheet. Designers should refer to the appropriate data
sheet of the same number for guaranteed specification limits.
Document Number: 74690
Revision: 09-May-07
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Si9945AEY_RC
Vishay Siliconix
R-C THERMAL MODEL FOR FILTER CONFIGURATION
R-C VALUES FOR FILTER CONFIGURATION
Thermal Resistance (°C/W)
Junction to
Ambient
Case
Foot
RF1
4.2231
N/A
8.7939
RF2
23.6271
N/A
12.3196
RF3
30.8934
N/A
9.5891
RF4
46.2564
N/A
7.2974
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CF1
791.1520 u
N/A
1.1401 m
CF2
6.6067 m
N/A
5.9885 m
CF3
49.0098 m
N/A
48.9471 m
CF4
1.8673
N/A
8.1118 m
Note: NA indicates not applicable
Reference:
[1] "A Simple Method of Generating Thermal Models for a Power MOSFET" by Wharton McDaniel and Kandarp Pandya, IEEE / SEMITHERM 2002
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Document Number: 74690
Revision: 09-May-07
Si9945AEY_RC
Vishay Siliconix
Document Number: 74690
Revision: 09-May-07
www.vishay.com
3