Si4430BDY_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 1.1396 N/A 780.4910 m RT2 24.1824 N/A 5.9983 RT3 39.3684 N/A 6.1818 RT4 16.1694 N/A 5.9911 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 233.2999 m N/A 8.9400 m CT2 22.8746 m N/A 44.9538 m CT3 427.4473 m N/A 326.5027 m CT4 9.7649 N/A 12.3631 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: 74094 Revision 31-Aug-05 www.vishay.com 1 Si4430BDY_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 4.6151 N/A 4.7710 RF2 22.6510 N/A 6.3956 RF3 33.2475 N/A 3.6127 RF4 19.3185 N/A 4.1737 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 4.8510 m N/A 5.6634 m CF2 23.0558 m N/A 8.6300 m CF3 320.7222 m N/A 70.8777 m CF4 3.5109 N/A 355.2036 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: 74094 Revision 31-Aug-05 Si4430BDY_RC Vishay Siliconix Document Number: 74094 Revision 31-Aug-05 www.vishay.com 3