Si8401DB_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 13.3312 N/A 8.6072 RT2 16.6030 N/A 1.1928 RT3 8.6883 N/A 3.2165 RT4 46.1721 N/A 6.9605 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 6.4860 m N/A 2.9728 m CT2 1.1631 m N/A 736.7198 u CT3 161.8455 m N/A 13.6910 m CT4 1.2554 N/A 3.4065 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: 73833 Revision 03-Mar-06 www.vishay.com 1 Si8401DB_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 20.5538 N/A 2.5867 RF2 13.2427 N/A 7.6648 RF3 12.6238 N/A 7.3328 RF4 38.6222 N/A 2.4236 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 897.4162 u N/A 482.4989 u CF2 8.0389 m N/A 958.4250 u CF3 416.2893 m N/A 222.3754 u CF4 1.0958 N/A 2.0874 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: 73833 Revision 03-Mar-06 Si8401DB_RC Vishay Siliconix Document Number: 73833 Revision 03-Mar-06 www.vishay.com 3