Si3495DV_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 9.7405 N/A 9.3699 RT2 23.4561 N/A 1.9356 RT3 25.1299 N/A 9.1739 RT4 51.6735 N/A 9.5206 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.7016 m N/A 39.9518 m CT2 29.8526 m N/A 338.4235 u CT3 11.4701 m N/A 6.5793 m CT4 1.2748 N/A 6.3393 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: 69560 Revision: 29-Aug-07 www.vishay.com 1 Si3495DV_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 10.9186 N/A 2.3663 RF2 28.7221 N/A 19.3306 RF3 19.7446 N/A 6.3032 RF4 50.6147 N/A 1.9999 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.2069 m N/A 346.5461 u CF2 5.3045 m N/A 2.5676 m CF3 17.4916 m N/A 22.0873 m CF4 1.2645 N/A 141.3338 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: 69560 Revision: 29-Aug-07 Si3495DV_RC Vishay Siliconix Document Number: 69560 Revision: 29-Aug-07 www.vishay.com 3