Si7454DP_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 2.0964 18.1348 µ N/A RT2 9.0489 713.7923 m N/A RT3 8.0177 1.3126 N/A RT4 50.6167 1.1896 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 24.2346 m 81.2397 µ N/A CT2 558.4598 m 673.3554 µ N/A CT3 70.7118 m 15.6345 m N/A CT4 1.4427 6.7185 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: 73634 Revision 28-Nov-05 www.vishay.com 1 Si7454DP_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 6.2277 164.8787 m N/A RF2 7.9322 888.8177 m N/A RF3 7.6428 1.2671 N/A RF4 47.9015 1.0331 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 16.9231 m 166.0609 µ N/A CF2 156.4465 m 357.5156 µ N/A CF3 2.8690 m 4.6473 m N/A CF4 1.2888 304.1798 µ N/A 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: 73634 Revision 28-Nov-05 Si7454DP_RC Vishay Siliconix Document Number: 73634 Revision 28-Nov-05 www.vishay.com 3