Si7686DP_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 8.5470 13.5731 m N/A RT2 2.3159 605.3055 m N/A RT3 13.0512 1.6585 N/A RT4 45.7415 997.1349 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 22.2343 m 1.6850 m N/A CT2 737.1785 u 769.3619 u N/A CT3 223.9436 m 6.9296 m N/A CT4 1.5415 5.4442 m N/A 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: 70395 Revision 21-Mar-07 www.vishay.com 1 Si7686DP_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Foot Junction to Ambient Case RF1 4.0414 72.1453 u N/A RF2 12.1369 1.1499 N/A RF3 16.2783 1.2302 N/A RF4 37.3369 934.5156 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.6382 m 545.8376 u N/A CF2 33.1604 m 171.5907 u N/A CF3 352.4092 m 3.5582 m N/A CF4 1.5386 1.3030 m N/A 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: 70395 Revision 21-Mar-07 Si7686DP_RC Vishay Siliconix Document Number: 70395 Revision 21-Mar-07 www.vishay.com 3