Si3867DV_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 9.5430 N/A 182.1251 m RT2 32.9456 N/A 1.8140 RT3 16.1654 N/A 14.2372 RT4 51.0928 N/A 13.5405 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.2752 m N/A 419.1259 u CT2 7.6497 m N/A 428.5498 u CT3 385.3693 m N/A 15.8268 m CT4 2.0398 N/A 2.6908 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:74979 Revision 13-Mar-07 www.vishay.com 1 Si3867DV_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 13.2605 N/A 1.7930 RF2 31.4941 N/A 12.4855 RF3 21.5677 N/A 11.7174 RF4 43.8145 N/A 3.9084 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.1320 m N/A 173.5435 u CF2 7.3026 m N/A 1.6696 m CF3 382.6052 m N/A 5.3728 m CF4 1.9872 N/A 79.6991 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:74979 Revision 13-Mar-07 Si3867DV_RC Vishay Siliconix Document Number:74979 Revision 13-Mar-07 www.vishay.com 3