Si8902EDB_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 51.8371 N/A 3.0368 RT2 32.9815 N/A 17.7874 RT3 20.4166 N/A 391.9596 m RT4 14.7648 N/A 783.8404 m Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.2938 N/A 16.7404 m CT2 46.6122 m N/A 2.4901 m CT3 4.1098 m N/A 306.5161 m CT4 6.6628 m N/A 235.5190 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: 69283 Revision: 10-Aug-07 www.vishay.com 1 Si8902EDB_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 36.8615 N/A 1.5772 RF2 18.1056 N/A 19.3310 RF3 20.4094 N/A 962.6364 m RF4 44.6235 N/A 129.1636 m Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 2.3438 m N/A 674.5841 u CF2 25.9526 m N/A 1.5358 m CF3 117.6861 m N/A 2.7859 m CF4 1.4677 N/A 51.7135 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: 69283 Revision: 10-Aug-07 Si8902EDB_RC Vishay Siliconix Document Number: 69283 Revision: 10-Aug-07 www.vishay.com 3