Si4386DY_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 configuration are included. The corresponding values for the Cauer/Filter configuration are available upon request. 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) Foot Junction to Ambient Case RT1 21.6313 N/A 8.2337 RT2 7.6735 N/A 1.1523 RT3 9.5731 N/A 6.0831 RT4 46.1140 N/A 6.5558 Junction to Ambient Case Foot CT1 52.5172 m N/A 66.5992 m CT2 6.1173 m N/A 1.1644 m CT3 1.5650 N/A 7.7891 m CT4 1.8427 N/A 346.0753 m Thermal Capacitance (Joules/°C) 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: 73734 Revision 16-Jan-06 www.vishay.com 1 Si4386DY_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 5.6212 N/A 2.6859 RF2 19.8134 N/A 7.3156 RF3 16.4932 N/A 10.1173 RF4 42.9300 N/A 1.8937 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 3.8314 m N/A 1.8815 m CF2 25.4743 m N/A 7.5150 m CF3 277.3923 m N/A 76.4052 m CF4 1.5334 N/A 1.1352 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: 73734 Revision 16-Jan-06 Si4386DY_RC Vishay Siliconix Document Number: 73734 Revision 16-Jan-06 www.vishay.com 3