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R-C Thermal Model Parameters

R-C THERMAL MODEL FOR TANK CONFIGURATION

Vishay Siliconix
R-C Thermal Model Parameters
DESCRIPTION
The parametric values in the R-C thermal model have been derived using curve-fitting techniques. R-C values for the electrical circuit in the Foster / tank and Cauer / filter configurations are included. When implemented in P-SPICE, these values have matching characteristic curves to the single-pulse transient thermal impedance curves for the MOSFET. These RC values can be used in the P-SPICE simulation to evaluate the thermal behavior of the MOSFET junction temperature under a defined power profile. These techniques are described in application note AN609, "Thermal Simulation of Power MOSFETs on the P-SPICE Platform".
R-C THERMAL MODEL FOR TANK CONFIGURATION
T (Junction)
T (Ambient)
R-C VALUES FOR TANK CONFIGURATION
THERMAL RESISTANCE (°C / W) Junction to RT1 RT2 RT3 RT4 Junction to CT1 CT2 CT3 CT4 Note N / A indicates not applicable Ambient 24.9534 32.7083 31.3409 35.9974 Ambient 33.7833 u 492.0543 u 7.4869 m 732.1349 m Case 17.2996 12.4294 753.4000 m 9.5176 Case 180.6510 u 527.3307 u 72.2282 m 36.5543 u Foot N / A N / A N / A N / A Foot N / A N / A N / A N / A
THERMAL CAPACITANCE (Joules / °C)
This document is intended as a SPICE modeling guideline and does not constitute a commercial product datasheet. Designers should refer to the appropriate datasheet of the same number for guaranteed specification limits.
Document Number: 64837 Revision: 31-Mar-09
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Vishay Siliconix
R-C THERMAL MODEL FOR FILTER CONFIGURATION
T (Junction)
T (Ambient)
CF4 GND
R-C VALUES FOR FILTER CONFIGURATION
THERMAL RESISTANCE (°C / W) Junction to RF1 RF2 RF3 RF4 Junction to CF1 CF2 CF3 CF4 Note N / A indicates not applicable Ambient 25.5146 34.1097 29.7392 35.6365 Ambient 28.7791 u 353.6025 u 6.7208 m 717.4945 m Case 14.8268 19.3796 5.6687 124.9000 m Case 29.3109 u 123.6870 u 813.3045 u 278.1963 u Foot N / A N / A N / A N / A Foot N / A N / A N / A N / A
THERMAL CAPACITANCE (Joules / °C)
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Document Number: 64837 Revision: 31-Mar-09
Vishay Siliconix
Document Number: 64837 Revision: 31-Mar-09
www.vishay.com 3