Si6963BDQ_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 24.8736 N/A 28.5067 RT2 6.8016 N/A 15.2315 RT3 70.9289 N/A 33.3805 RT4 47.3959 N/A 2.8813 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 5.8589 m N/A 11.2005 m CT2 1.8241 m N/A 3.9988 m CT3 14.1363 m N/A 30.6373 m CT4 1.6678 N/A 434.1574 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: 74839 Revision: 10-Jul-07 www.vishay.com 1 Si6963BDQ_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 18.1299 N/A 3.7502 RF2 40.2959 N/A 26.0342 RF3 44.5423 N/A 28.9295 RF4 47.0319 N/A 21.2861 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.3357 m N/A 347.1420 u CF2 4.9577 m N/A 2.1365 m CF3 10.2156 m N/A 7.0796 m CF4 1.5908 N/A 17.1357 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: 74839 Revision: 10-Jul-07 Si6963BDQ_RC Vishay Siliconix Document Number: 74839 Revision: 10-Jul-07 www.vishay.com 3