Si1473DH_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 13.1726 N/A 6.5039 RT2 22.4447 N/A 19.9984 RT3 34.3423 N/A 10.9885 RT4 55.0404 N/A 7.5092 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 342.8128 u N/A 150.1013 m CT2 61.3646 m N/A 1.7193 m CT3 3.4091 m N/A 6.1462 m CT4 1.3732 N/A 196.8209 u 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: 70494 Revision: 03-May-07 www.vishay.com 1 Si1473DH_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 16.0347 N/A 8.7965 RF2 36.7512 N/A 29.5268 RF3 20.6145 N/A 2.1542 RF4 51.5996 N/A 4.5225 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 312.5484 u N/A 154.7457 u CF2 3.1565 m N/A 1.2134 m CF3 83.1170 m N/A 120.3345 m CF4 1.4144 N/A 665.7070 u 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: 70494 Revision: 03-May-07 Si1473DH_RC Vishay Siliconix Document Number: 70494 Revision: 03-May-07 www.vishay.com 3