Si7344DP_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 38.9290 1.0399 N/A RT2 10.8790 1.3479 N/A RT3 16.5097 1.2510 N/A RT4 3.6823 1.8612 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.3983 1.2485 m N/A CT2 80.2007 m 37.3386 m N/A CT3 1.6986 251.4874 m N/A CT4 3.5945 m 21.5348 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: 69204 Revision: 23-Jul-07 www.vishay.com 1 Si7344DP_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 4.9201 1.2891 N/A RF2 11.6558 2.0708 N/A RF3 27.7338 1.5451 N/A RF4 25.6903 595.0000 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 4.6186 m 1.1669 m N/A CF2 79.0991 m 11.6625 m N/A CF3 870.6646 m 15.7170 m N/A CF4 1.7149 710.6919 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: 69204 Revision: 23-Jul-07 Si7344DP_RC Vishay Siliconix Document Number: 69204 Revision: 23-Jul-07 www.vishay.com 3