SiB911DK_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 24.7202 17.0285 N/A RT2 36.0217 10.9462 N/A RT3 32.5543 302.0000 m N/A RT4 31.7038 11.7233 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 33.8005 u 236.4599 u N/A CT2 730.9573 m 575.8540 u N/A CT3 480.9535 u 677.7926 m N/A CT4 7.2586 m 41.2419 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: 69755 Revision: 05-Oct-07 www.vishay.com 1 SiB911DK_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 32.5774 14.8268 N/A RF2 36.3650 19.3796 N/A RF3 21.9662 5.6687 N/A RF4 34.0914 124.9000 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 36.0236 u 29.3109 u N/A CF2 734.2795 u 123.6870 u N/A CF3 15.7342 m 813.3045 u N/A CF4 790.0923 m 278.1963 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: 69755 Revision: 05-Oct-07 SiB911DK_RC Vishay Siliconix Document Number: 69755 Revision: 05-Oct-07 www.vishay.com 3