Si1499DH_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 18.0498 N/A 22.8576 RT2 13.5465 N/A 6.8294 RT3 37.3879 N/A 6.2761 RT4 56.0158 N/A 9.0369 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 129.6988 m N/A 1.3960 m CT2 321.1174 u N/A 181.6222 u CT3 3.9039 m N/A 273.9235 m CT4 1.5540 N/A 11.2394 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: 74809 Revision: 19-Jul-07 www.vishay.com 1 Si1499DH_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 15.6843 N/A 5.3345 RF2 36.9662 N/A 5.7488 RF3 19.0906 N/A 26.8876 RF4 53.2589 N/A 7.0291 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 305.6295 u N/A 110.7145 u CF2 3.4551 m N/A 352.3051 u CF3 112.9520 m N/A 1.0915 m CF4 1.5143 N/A 168.0905 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: 74809 Revision: 19-Jul-07 Si1499DH_RC Vishay Siliconix Document Number: 74809 Revision: 19-Jul-07 www.vishay.com 3