Si8407DB_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 10.4526 N/A 1.8770 RT2 19.7498 N/A 11.8244 RT3 13.7958 N/A 182.8000 m RT4 41.0018 N/A 5.1158 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.0735 m N/A 1.5762 m 2.4035 m CT2 3.7703 m N/A CT3 409.7869 m N/A 12.3188 CT4 2.0736 N/A 15.3613 m 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: 69279 Revision: 08-Aug-07 www.vishay.com 1 Si8407DB_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 12.6462 N/A 8.8130 RF2 17.7656 N/A 9.1819 RF3 18.1505 N/A 762.1622 m RF4 36.4377 N/A 242.9378 m Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 730.9942 u N/A 1.0532 m CF2 2.5602 m N/A 3.2146 m CF3 317.2725 m N/A 45.1916 m CF4 1.9260 N/A 3.0159 m 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: 69279 Revision: 08-Aug-07 Si8407DB_RC Vishay Siliconix Document Number: 69279 Revision: 08-Aug-07 www.vishay.com 3