Si7682DP_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) Foot Junction to Ambient Case RT1 8.5249 m 137.0052 m N/A RT2 68.1623 m 164.8549 m N/A RT3 234.4992 m 158.3985 m N/A RT4 686.7862 m 540.1760 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 27.0132 µ 4.8100 m N/A CT2 416.7856 m 111.9111 m N/A CT3 5.7899 1.4916 N/A CT4 91.0623 124.6333 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: 73643 Revision 06-Dec-05 www.vishay.com 1 Si7682DP_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 82.9260 m 192.9603 m N/A RF2 253.7706 m 337.6448 m N/A RF3 332.7713 m 265.2590 m N/A RF4 328.2689 m 200.3314 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 381.5162 m 5.2422 m N/A CF2 4.9568 64.4907 m N/A CF3 87.1426 22.2465 m N/A CF4 2.1623 443.9172 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: 73643 Revision 06-Dec-05 Si7682DP_RC Vishay Siliconix Document Number: 73643 Revision 06-Dec-05 www.vishay.com 3