Si4418DY-RC

Si4418DY_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
4.3409
N/A
8.3106
RT2
24.9737
N/A
1.7560
RT3
21.5562
N/A
3.6732
RT4
34.1292
N/A
6.2602
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CT1
4.9820 m
N/A
9.8912 m
CT2
534.6732 m
N/A
1.5419 m
CT3
40.1839 m
N/A
663.4727 m
CT4
4.2734
N/A
233.0076 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: 69734
Revision: 02-Oct-07
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Si4418DY_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
6.9746
N/A
1.7911
RF2
23.5476
N/A
7.0008
RF3
29.3982
N/A
3.0304
RF4
25.0796
N/A
8.1777
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CF1
5.8029 m
N/A
1.0406 m
CF2
36.6252 m
N/A
7.0542 m
CF3
557.7191 m
N/A
16.9649 m
CF4
5.5742
N/A
208.1899 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: 69734
Revision: 02-Oct-07
Si4418DY_RC
Vishay Siliconix
Document Number: 69734
Revision: 02-Oct-07
www.vishay.com
3