Si7452DP_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 816.9183 m 324.4979 u N/A RT2 6.3753 286.9499 m N/A RT3 8.4873 251.3020 m N/A RT4 48.9947 762.3926 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.3984 m 625.3748 u N/A CT2 49.9901 m 3.0330 m N/A CT3 294.4438 m 39.2410 m N/A CT4 1.3751 11.3185 m N/A 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:73723 Revision 13-Jan-06 www.vishay.com 1 Si7452DP_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 7.6597 250.0066 m N/A RF2 6.7288 255.7609 m N/A RF3 6.9255 578.7731 m N/A RF4 43.5775 214.5172 m N/A Junction to Ambient Case Foot CF1 27.3576 m 1.4941 m N/A CF2 220.2736 m 3.1793 m N/A CF3 30.2816 m 4.4688 m N/A CF4 1.3100 103.3651 u N/A Thermal Capacitance (Joules/°C) 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:73723 Revision 13-Jan-06 Si7452DP_RC Vishay Siliconix Document Number:73723 Revision 13-Jan-06 www.vishay.com 3