Si7860DP_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 37.4121 456.8056 m N/A RT2 11.9075 594.2164 m N/A RT3 17.7112 243.1780 m N/A RT4 2.9692 1.0058 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.2919 1.8736 m N/A CT2 69.9170 m 15.1576 m N/A CT3 1.2812 19.6083 m N/A CT4 10.8719 m 24.0739 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: 69265 Revision: 06-Aug-07 www.vishay.com 1 Si7860DP_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Foot Junction to Ambient Case RF1 3.7073 677.6259 m N/A RF2 11.9067 648.3863 m N/A RF3 26.3342 485.5114 m N/A RF4 28.0518 488.4764 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 8.4590 m 1.4523 m N/A CF2 50.6640 m 4.0094 m N/A CF3 617.4415 m 7.7628 m N/A CF4 1.8369 24.6477 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: 69265 Revision: 06-Aug-07 Si7860DP_RC Vishay Siliconix Document Number: 69265 Revision: 06-Aug-07 www.vishay.com 3