Si4953ADY_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 20.7160 N/A 17.1389 RT2 5.5506 N/A 3.9724 RT3 27.9011 N/A 9.8622 RT4 55.6595 N/A 8.8776 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 11.7362 m N/A 2.4908 m CT2 1.5339 m N/A 285.8137 u CT3 60.6292 m N/A 15.2904 m CT4 1.3777 N/A 93.4063 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: 70383 Revision 19-Mar-07 www.vishay.com 1 Si4953ADY_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 8.0294 N/A 4.5113 RF2 27.9960 N/A 24.0737 RF3 22.8634 N/A 10.5751 RF4 51.2115 N/A 1.2756 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.5740 m N/A 207.0248 u CF2 9.0222 m N/A 1.8986 m CF3 81.6519 m N/A 41.4354 m CF4 1.4719 N/A 10.4137 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: 70383 Revision 19-Mar-07 Si4953ADY_RC Vishay Siliconix Document Number: 70383 Revision 19-Mar-07 www.vishay.com 3