Si9435BDY_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 6.7987 N/A 4.3992 RT2 5.7943 N/A 8.1152 RT3 35.8559 N/A 4.0411 RT4 46.5511 N/A 13.4445 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.2053 m N/A 352.6090 u CT2 5.7429 m N/A 9.8498 m CT3 35.0152 m N/A 26.4721 m CT4 1.3575 N/A 134.3235 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: 69289 Revision: 10-Aug-07 www.vishay.com 1 Si9435BDY_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 10.0985 N/A 4.0831 RF2 18.4045 N/A 7.3684 RF3 22.7346 N/A 7.4610 RF4 43.6853 N/A 11.0875 Junction to Ambient Case Foot CF1 902.7400 u N/A 279.2437 u CF2 18.7163 m N/A 4.1858 m CF3 35.1264 m N/A 11.4958 m CF4 1.4280 N/A 149.1656 m 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: 69289 Revision: 10-Aug-07 Si9435BDY_RC Vishay Siliconix Document Number: 69289 Revision: 10-Aug-07 www.vishay.com 3