Si4840DY-RC

Si4840DY_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
configuration are included. The corresponding values
for the Cauer/Filter configuration are available upon
request.
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
6.3837
N/A
814.1216 m
RT2
23.5969
N/A
5.1502
RT3
11.7636
N/A
8.7315
RT4
37.8280
N/A
6.0646
Junction to
Ambient
Case
Foot
CT1
7.1133 m
N/A
1.1542 m
CT2
42.1320 m
N/A
55.0336 m
CT3
451.2182 m
N/A
186.5985 m
CT4
2.0857
N/A
12.4567 m
Thermal Capacitance (Joules/°C)
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:73573
Revision 14-Nov-05
www.vishay.com
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Si4840DY_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
1.4812
N/A
1.3800
RF2
18.5625
N/A
9.8802
RF3
23.3405
N/A
5.9810
RF4
36.1156
N/A
3.6960
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CF1
1.0519 m
N/A
1.8193 m
CF2
13.7218 m
N/A
8.7221 m
CF3
87.3638 m
N/A
90.1949 m
CF4
2.0071
N/A
347.1210 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:73573
Revision 14-Nov-05
Si4840DY_RC
Vishay Siliconix
Document Number:73573
Revision 14-Nov-05
www.vishay.com
3