Si6404DQ_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 7.2518 N/A 1.2495 RT2 24.3624 N/A 26.8204 RT3 22.7839 N/A 9.3206 RT4 60.6018 N/A 7.6095 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 13.8217 m N/A 3.7607 m CT2 64.1316 m N/A 28.0563 m CT3 28.2902 m N/A 264.3308 m CT4 1.4136 N/A 13.2307 m 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: 74820 Revision: 20-Jul-07 www.vishay.com 1 Si6404DQ_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 8.1164 N/A 2.4068 RF2 33.6762 N/A 13.4572 RF3 17.6931 N/A 18.1618 RF4 55.5144 N/A 10.9742 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 5.8648 m N/A 2.6364 m CF2 9.1341 m N/A 6.2356 m CF3 96.7165 m N/A 15.9079 m CF4 1.5428 N/A 89.3110 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: 74820 Revision: 20-Jul-07 Si6404DQ_RC Vishay Siliconix Document Number: 74820 Revision: 20-Jul-07 www.vishay.com 3