Si9407AEY_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 18.2541 N/A 2.1100 RT2 10.9042 N/A 7.0820 RT3 3.5072 N/A 6.8889 RT4 52.6116 N/A 8.9502 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 111.3046 m N/A 3.0125 m CT2 27.1060 m N/A 46.5361 m CT3 1.3344 m N/A 147.3208 m CT4 1.4981 N/A 5.2600 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: 73749 Revision 17-Jan-06 www.vishay.com 1 Si9407AEY_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 4.4215 N/A 4.5957 RF2 14.6812 N/A 9.0439 RF3 16.7383 N/A 9.6950 RF4 49.4280 N/A 1.7639 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.6090 m N/A 1.5450 m CF2 21.8444 m N/A 3.9761 m CF3 91.2122 m N/A 39.6644 m CF4 1.4926 N/A 733.7564 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: 73749 Revision 17-Jan-06 Si9407AEY_RC Vishay Siliconix Document Number: 73749 Revision 17-Jan-06 www.vishay.com 3