SiA913DJ_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) Foot Junction to Ambient Case RT1 12.4956 764.1000 m N/A RT2 27.7856 5.6063 N/A RT3 26.5938 5.7425 N/A RT4 43.1250 3.8871 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 90.5075 u 5.0483 m N/A CT2 1.9927 m 452.2021 u N/A CT3 34.1260 m 54.4164 u N/A CT4 1.1120 486.1773 u 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: 73993 Revision: 21-Jun-07 www.vishay.com 1 SiA913DJ_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 14.2316 8.6635 N/A RF2 31.2018 4.0091 N/A RF3 23.4768 1.6771 N/A RF4 41.0898 1.6503 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 92.0140 u 43.9117 u N/A CF2 2.0224 m 226.4934 u N/A CF3 41.6061 m 229.4698 u N/A CF4 1.1219 103.4306 u 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: 73993 Revision: 21-Jun-07 SiA913DJ_RC Vishay Siliconix Document Number: 73993 Revision: 21-Jun-07 www.vishay.com 3