Si4435BDY_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 7.5111 N/A 1.3836 RT2 28.2372 N/A 5.5041 RT3 21.2833 N/A 9.0276 RT4 27.9216 N/A 6.0953 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 4.2636 m N/A 1.3161 m CT2 44.2218 m N/A 36.4143 m CT3 2.9587 N/A 106.6606 m CT4 2.1215 N/A 11.2373 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: 74097 Revision 31-Aug-05 www.vishay.com 1 Si4435BDY_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 5.0156 N/A 3.9027 RF2 30.2279 N/A 8.8634 RF3 26.3698 N/A 4.8270 RF4 23.4457 N/A 4.3723 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.0537 m N/A 2.9341 m CF2 29.9132 m N/A 6.6125 m CF3 859.8470 m N/A 67.0295 m CF4 1.3858 N/A 1.8546 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: 74097 Revision 31-Aug-05 Si4435BDY_RC Vishay Siliconix Document Number: 74097 Revision 31-Aug-05 www.vishay.com 3