Si4401BDY_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 4.6630 N/A 957.8288 m RT2 30.4017 N/A 4.6741 RT3 26.1463 N/A 9.2794 RT4 22.6225 N/A 6.1811 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 5.7474 m N/A 1.3107 m CT2 39.7462 m N/A 112.4465 m CT3 1.7481 N/A 189.2448 m CT4 3.4781 N/A 6.4133 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: 74087 Revision 29-Aug-05 www.vishay.com 1 Si4401BDY_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 2.6371 N/A 4.1688 RF2 32.4430 N/A 6.1387 RF3 28.4228 N/A 6.3994 RF4 20.5668 N/A 4.2738 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.0006 m N/A 2.4342 m CF2 29.4484 m N/A 11.8063 m CF3 885.1865 m N/A 111.2368 m CF4 2.0198 N/A 35.5996 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: 74087 Revision 29-Aug-05 Si4401BDY_RC Vishay Siliconix Document Number: 74087 Revision 29-Aug-05 www.vishay.com 3