Si4484EY-RC

Si4484EY_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
4.9280
N/A
536.3249 m
RT2
26.4288
N/A
4.6553
RT3
26.4135
N/A
10.1038
RT4
27.3492
N/A
5.6867
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CT1
7.0702 m
N/A
644.2123 µ
CT2
45.4725 m
N/A
65.5331 m
CT3
1.8744
N/A
157.8483 m
CT4
4.2541
N/A
10.8807 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: 74107
Revision 02-Sep-05
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Si4484EY_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
2.6273
N/A
2.7852
RF2
27.5087
N/A
8.1195
RF3
23.0822
N/A
5.8581
RF4
31.8094
N/A
4.2091
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CF1
1.0532 m
N/A
3.5316 m
CF2
30.2590 m
N/A
10.7913 m
CF3
783.3855 m
N/A
104.4945 m
CF4
1.7732
N/A
59.3930
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: 74107
Revision 02-Sep-05
Si4484EY_RC
Vishay Siliconix
Document Number: 74107
Revision 02-Sep-05
www.vishay.com
3