Si9433BDY_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 5.6429 N/A 1.7981 RT2 9.1819 N/A 8.3861 RT3 26.3958 N/A 2.8307 RT4 53.7794 N/A 10.9851 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 712.3648 u N/A 370.7541 u CT2 21.5506 m N/A 12.1387 m CT3 53.1312 m N/A 2.8770 m CT4 1.1873 N/A 128.6109 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: 69286 Revision: 10-Aug-07 www.vishay.com 1 Si9433BDY_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 6.6819 N/A 3.5216 RF2 17.4443 N/A 6.2612 RF3 19.8009 N/A 6.1328 RF4 51.0729 N/A 8.0844 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 757.5251 u N/A 443.8253 u CF2 16.9792 m N/A 5.3715 m CF3 46.7434 m N/A 18.5880 m CF4 1.1917 N/A 164.4405 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: 69286 Revision: 10-Aug-07 Si9433BDY_RC Vishay Siliconix Document Number: 69286 Revision: 10-Aug-07 www.vishay.com 3