Si7407DN_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) Foot Junction to Ambient Case RT1 6.6678 568.5422 m N/A RT2 35.0895 257.4745 m N/A RT3 15.9838 76.2833 m N/A RT4 23.2589 1.4977 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 7.2586 m 1.0022 m N/A N/A CT2 2.5015 16.9938 m CT3 50.2866 m 226.0908 m N/A CT4 2.3938 10.8229 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: 69211 Revision: 23-Jul-07 www.vishay.com 1 Si7407DN_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Foot Junction to Ambient Case RF1 8.6271 687.6158 m N/A RF2 14.7288 670.6725 m N/A RF3 22.0958 718.4132 m N/A RF4 35.5483 323.2985 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 6.2941 m 801.7716 u N/A CF2 44.3499 m 6.0245 m N/A CF3 961.8988 m 458.2224 u N/A CF4 689.3641 m 30.8864 m 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: 69211 Revision: 23-Jul-07 Si7407DN_RC Vishay Siliconix Document Number: 69211 Revision: 23-Jul-07 www.vishay.com 3