Si4418DY_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 4.3409 N/A 8.3106 RT2 24.9737 N/A 1.7560 RT3 21.5562 N/A 3.6732 RT4 34.1292 N/A 6.2602 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 4.9820 m N/A 9.8912 m CT2 534.6732 m N/A 1.5419 m CT3 40.1839 m N/A 663.4727 m CT4 4.2734 N/A 233.0076 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: 69734 Revision: 02-Oct-07 www.vishay.com 1 Si4418DY_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 6.9746 N/A 1.7911 RF2 23.5476 N/A 7.0008 RF3 29.3982 N/A 3.0304 RF4 25.0796 N/A 8.1777 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 5.8029 m N/A 1.0406 m CF2 36.6252 m N/A 7.0542 m CF3 557.7191 m N/A 16.9649 m CF4 5.5742 N/A 208.1899 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: 69734 Revision: 02-Oct-07 Si4418DY_RC Vishay Siliconix Document Number: 69734 Revision: 02-Oct-07 www.vishay.com 3