Si4860DY_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 7.1243 N/A 6.0699 RT2 19.2975 N/A 1.3394 RT3 20.1293 N/A 3.6075 RT4 33.2094 N/A 4.9804 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 11.9105 m N/A 17.0213 m CT2 1.3676 N/A 12.1561 m CT3 63.6479 m N/A 167.9527 m CT4 3.2613 N/A 551.2294 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: 70367 Revision 19-Mar-07 www.vishay.com 1 Si4860DY_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 8.3150 N/A 4.2741 RF2 19.4920 N/A 4.6448 RF3 15.7451 N/A 4.3127 RF4 35.9497 N/A 2.7592 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 9.0905 m N/A 7.1184 m CF2 42.7368 m N/A 12.9760 m CF3 572.7245 m N/A 136.0106 m CF4 1.4671 N/A 756.8259 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: 70367 Revision 19-Mar-07 Si4860DY_RC Vishay Siliconix Document Number: 70367 Revision 19-Mar-07 www.vishay.com 3