Si3458DV_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 9.0596 N/A 3.0596 RT2 10.4825 N/A 6.6267 RT3 34.9521 N/A 9.6100 RT4 55.3377 N/A 10.8368 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.2529 m N/A 539.1091 u CT2 269.9715 m N/A 8.8348 m CT3 7.6456 m N/A 29.9287 m CT4 1.4475 N/A 5.1893 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: 70425 Revision 28-Mar-07 www.vishay.com 1 Si3458DV_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 13.3612 N/A 4.7109 RF2 26.7090 N/A 10.3187 RF3 15.0058 N/A 10.0952 RF4 54.6176 N/A 4.8760 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.1938 m N/A 548.8720 u CF2 6.0509 m N/A 2.2304 m CF3 62.0085 m N/A 2.2729 m CF4 1.3374 N/A 43.4357 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: 70425 Revision 28-Mar-07 Si3458DV_RC Vishay Siliconix Document Number: 70425 Revision 28-Mar-07 www.vishay.com 3