SiA912DJ_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 28.2299 764.1000 m N/A RT2 13.6699 5.6063 N/A RT3 25.0926 5.7425 N/A RT4 43.0076 3.8871 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.2905 m 5.0483 m N/A CT2 103.0985 u 452.2021 u N/A CT3 40.8990 m 54.4164 u N/A CT4 1.1298 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: 70474 Revision: 03-May-07 www.vishay.com 1 SiA912DJ_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 8.7814 N/A RF2 31.2018 3.8508 N/A RF3 23.4768 1.7242 N/A RF4 41.0898 1.6436 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 92.0120 u 44.9616 u N/A CF2 2.0226 m 223.7685 u N/A CF3 43.4095 m 248.7748 u N/A CF4 1.1315 102.4675 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: 70474 Revision: 03-May-07 SiA912DJ_RC Vishay Siliconix Document Number: 70474 Revision: 03-May-07 www.vishay.com 3