Si1431DH_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 37.6059 N/A 16.8164 RT2 8.9329 N/A 4.2163 RT3 32.0253 N/A 5.6481 RT4 45.3694 N/A 18.2121 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.8734 N/A 3.1327 m CT2 302.6965 u N/A 472.7364 u CT3 136.3720 m N/A 137.0990 m CT4 3.3172 m N/A 7.5049 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: 70452 Revision: 03-May-07 www.vishay.com 1 Si1431DH_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 13.5977 N/A 8.4321 RF2 43.3661 N/A 21.1588 RF3 33.8752 N/A 11.3124 RF4 33.1824 N/A 4.0434 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 410.3851 u N/A 568.7520 u CF2 3.3079 m N/A 1.7481 m CF3 129.2986 m N/A 5.6968 m CF4 1.9704 N/A 194.8918 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: 70452 Revision: 03-May-07 Si1431DH_RC Vishay Siliconix Document Number: 70452 Revision: 03-May-07 www.vishay.com 3