SiA411DJ_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 11.6073 2.0544 N/A RT2 5.5097 1.3706 N/A RT3 17.8868 317.4000 m N/A RT4 44.9962 2.7576 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 218.0785 m 1.1988 m N/A CT2 440.3552 u 194.0091 u N/A CT3 6.6195 m 34.1528 m N/A CT4 1.7908 1.0497 m N/A 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: 69753 Revision: 05-Oct-07 www.vishay.com 1 SiA411DJ_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 5.1725 3.1805 N/A RF2 17.9817 3.2979 N/A RF3 12.9513 20.4076 m N/A RF4 43.8945 1.1924 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 309.3985 u 174.5173 u N/A CF2 5.0173 m 734.0575 u N/A CF3 130.8060 m 9.4367 N/A CF4 1.6398 3.5631 N/A 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 www.vishay.com 2 Document Number: 69753 Revision: 05-Oct-07 SiA411DJ_RC Vishay Siliconix Document Number: 69753 Revision: 05-Oct-07 www.vishay.com 3