Si7882DP_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 37.5406 954.6352 m N/A RT2 8.7467 703.5545 m N/A RT3 14.9130 689.0641 m N/A RT4 3.7997 252.7462 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.9744 14.6593 m N/A CT2 117.6821 m 4.4760 m N/A CT3 1.3856 22.1687 m N/A CT4 10.8596 m 775.9059 u 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: 69261 Revision: 03-Aug-07 www.vishay.com 1 Si7882DP_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 3.0658 209.6948 m N/A RF2 10.4107 462.6679 m N/A RF3 25.2676 952.7478 m N/A RF4 26.2559 974.8895 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 7.1561 m 416.0910 u N/A CF2 66.7709 m 918.7820 u N/A CF3 797.2794 m 2.5888 m N/A CF4 3.0054 8.2583 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: 69261 Revision: 03-Aug-07 Si7882DP_RC Vishay Siliconix Document Number: 69261 Revision: 03-Aug-07 www.vishay.com 3