SiB411DK_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 26.9628 1.1278 m N/A RT2 13.8449 51.4366 m N/A RT3 14.7742 4.9136 N/A RT4 48.9841 4.5126 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 4.3960 m 5.4337 u N/A N/A CT2 254.1818 u 1.1487 m CT3 289.7400 m 65.6663 u N/A CT4 1.6281 333.4860 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: 70412 Revision 22-Mar-07 www.vishay.com 1 SiB411DK_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 14.2399 2.7390 N/A RF2 26.7266 4.8531 N/A RF3 18.7649 148.0174 m N/A RF4 45.2590 1.7445 N/A Junction to Ambient Case Foot CF1 218.1370 u 32.0113 u N/A CF2 3.6830 m 77.9062 u N/A CF3 208.5424 m 542.5600 u N/A CF4 1.5514 15.9892 u N/A Thermal Capacitance (Joules/°C) 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: 70412 Revision 22-Mar-07 SiB411DK_RC Vishay Siliconix Document Number: 70412 Revision 22-Mar-07 www.vishay.com 3