SiF912EDZ_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 5.2307 258.2000 m N/A RT2 10.5138 904.8000 m N/A RT3 13.8881 2.2365 N/A RT4 46.3674 2.2005 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 828.7250 u 131.9481 m N/A CT2 336.4470 m 344.5202 u N/A CT3 16.6023 m 5.7437 m N/A CT4 1.8885 5.9266 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: 69299 Revision: 13-Aug-07 www.vishay.com 1 SiF912EDZ_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 5.3364 1.3367 N/A RF2 13.7409 2.2601 N/A RF3 12.2337 1.9525 N/A RF4 44.6890 50.7000 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 682.7187 u 352.3871 u N/A CF2 12.8100 m 2.8653 m N/A CF3 190.3793 m 864.3439 u N/A CF4 1.6751 23.1706 m 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: 69299 Revision: 13-Aug-07 SiF912EDZ_RC Vishay Siliconix Document Number: 69299 Revision: 13-Aug-07 www.vishay.com 3