Si7866ADP_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 946.5230 m 183.0276 µ N/A RT2 8.0656 353.5314 m N/A RT3 10.1483 346.7550 m N/A RT4 45.8518 803.7650 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 11.4890 m 606.1407 µ N/A CT2 911.3916 m 1.9730 m N/A CT3 56.2065 m 46.7980 m N/A CT4 1.5554 23.2194 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: 73649 Revision 29-Nov-05 www.vishay.com 1 Si7866ADP_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 7.6016 102.1132 µ N/A RF2 6.8601 472.5244 m N/A RF3 7.0503 437.2947 m N/A RF4 43.0605 586.8335 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 24.5023 m 1.0365 m N/A CF2 215.8741 m 913.8278 µ N/A CF3 5.3302 m 13.9185 m N/A CF4 1.2592 3.1927 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: 73649 Revision 29-Nov-05 Si7866ADP_RC Vishay Siliconix Document Number: 73649 Revision 29-Nov-05 www.vishay.com 3