SiA850DJ_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. 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 R-C VALUES FOR TANK CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient-Mosfet Case-Mosfet Ambient-Schtky Case-Schtky RT1 25.8101 1.3523 25.8101 1.3523 RT2 12.2296 5.6589 12.2296 5.6589 RT3 27.8919 5.0019 27.8919 5.0019 RT4 44.0684 3.9869 44.0684 3.9869 Case-Schtky Thermal Capacitance (Joules/°C) Junction to Ambient-Mosfet Case-Mosfet Ambient-Schtky CT1 1.8429 m 1.0155 m 1.8429 m 1.0155 m CT2 90.4532 u 564.8306 u 90.4532 u 564.8306 u CT3 27.4483 m 55.9280 u 27.4483 m 55.9280 u CT4 1.0617 357.4204 u 1.0617 357.4204 u 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: 68947 Revision: 03-Sep-08 www.vishay.com 1 SiA850DJ_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient-Mosfet Case-Mosfet Ambient-Schtky Case-Schtky RF1 14.2316 6.6789 14.2316 6.6789 RF2 31.2017 4.9199 31.2017 4.9199 RF3 23.4768 2.7079 23.4768 2.7079 RF4 41.0899 1.6933 41.0899 1.6933 Case-Schtky Thermal Capacitance (Joules/°C) Junction to Ambient-Mosfet Case-Mosfet Ambient-Schtky CF1 92.0097 u 37.0761 u 92.0097 u 37.0761 u CF2 2.0230 m 118.4691 u 2.0230 m 118.4691 u CF3 43.4126 m 211.8647 u 43.4126 m 211.8647 u CF4 1.1315 980.4259 u 1.1315 980.4259 u Note NA indicates not applicable www.vishay.com 2 Document Number: 68947 Revision: 03-Sep-08 SiA850DJ_RC Vishay Siliconix Document Number: 68947 Revision: 03-Sep-08 www.vishay.com 3 SiA850DJ_RC Vishay Siliconix www.vishay.com 4 Document Number: 68947 Revision: 03-Sep-08