Si4320DY_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 34.5713 N/A 5.1466 RT2 5.3040 N/A 1.4251 RT3 18.6324 N/A 977.4672 m N/A 8.4279 RT4 23.4795 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.4116 N/A 24.7525 m CT2 20.5647 m N/A 13.8477 m CT3 72.9165 m N/A 5.1294 CT4 13.3524 N/A 162.4819 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: 74990 Revision 14-Mar-07 www.vishay.com 1 Si4320DY_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 7.3741 N/A 1.9861 RF2 19.1716 N/A 5.4633 RF3 35.8683 N/A 5.1414 RF4 17.4178 N/A 3.3535 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 14.4090 m N/A 7.3468 m CF2 58.2712 m N/A 9.6898 m CF3 1.2685 N/A 128.6142 m CF4 8.8615 N/A 188.7455 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: 74990 Revision 14-Mar-07 Si4320DY_RC Vishay Siliconix Document Number: 74990 Revision 14-Mar-07 www.vishay.com 3