Si4346DY_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 10.8265 N/A 1.5271 RT2 27.9865 N/A 9.8875 RT3 27.1895 N/A 11.3544 RT4 29.0443 N/A 4.1856 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.2218 m N/A 460.8589 µ CT2 34.6844 m N/A 7.5559 m CT3 1.7620 N/A 104.8735 m CT4 2.6514 N/A 893.7954 µ 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: 74084 Revision 29-Aug-05 www.vishay.com 1 Si4346DY_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 10.1229 N/A 6.1153 RF2 29.9305 N/A 10.4867 RF3 31.6783 N/A 9.9682 RF4 23.0782 N/A 327.4199 m Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 569.6012 µ N/A 407.4008 µ CF2 30.2683 m N/A 6.1887 m CF3 916.3560 m N/A 104.4619 m CF4 856.5287 m N/A 26.4625 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: 74084 Revision 29-Aug-05 Si4346DY_RC Vishay Siliconix Document Number: 74084 Revision 29-Aug-05 www.vishay.com 3