Si7348DP_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 37.3485 2.0754 N/A RT2 13.7941 1.3736 N/A RT3 13.8301 2.8291 N/A RT4 5.0273 1.7219 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.3146 701.1959 u N/A CT2 64.9796 m 347.3899 m N/A CT3 1.9252 14.3331 m N/A CT4 1.6634 m 29.2564 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: 69205 Revision: 23-Jul-07 www.vishay.com 1 Si7348DP_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 5.5900 2.0543 N/A RF2 14.8821 622.9000 m N/A RF3 21.5847 4.3051 N/A RF4 27.9432 1.0177 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.7943 m 637.2885 u N/A CF2 65.7008 m 1.8077 m N/A CF3 850.5968 m 8.7971 m N/A CF4 1.4993 330.8845 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: 69205 Revision: 23-Jul-07 Si7348DP_RC Vishay Siliconix Document Number: 69205 Revision: 23-Jul-07 www.vishay.com 3