Si3499DV_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 10.0272 N/A 5.9778 RT2 27.5316 N/A 18.4421 RT3 22.2039 N/A 3.4747 RT4 50.2373 N/A 2.1054 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.6932 m N/A 61.2556 m CT2 27.2422 m N/A 3.3348 m CT3 13.0575 m N/A 139.9357 m CT4 1.3042 N/A 446.6554 u 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: 74661 Revision: 03-May-07 www.vishay.com 1 Si3499DV_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 10.1772 N/A 2.6841 RF2 22.8751 N/A 17.3830 RF3 27.6067 N/A 4.1732 RF4 49.3410 N/A 5.7597 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.1687 m N/A 434.8686 u CF2 4.9289 m N/A 2.4125 m CF3 12.3825 m N/A 15.6296 m CF4 1.3252 N/A 33.5417 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: 74661 Revision: 03-May-07 Si3499DV_RC Vishay Siliconix Document Number: 74661 Revision: 03-May-07 www.vishay.com 3