Si7214DN_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) Foot Junction to Ambient Case RT1 13.7825 773.3427 m N/A RT2 12.9709 1.1877 N/A RT3 11.9353 1.4755 N/A RT4 55.1068 1.9678 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 11.0393 m 272.2830 u N/A CT2 106.1373 m 5.2253 m N/A CT3 668.0599 u 3.1851 m N/A CT4 1.5189 1.2049 m N/A 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: 70401 Revision 21-Mar-07 www.vishay.com 1 Si7214DN_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Foot Junction to Ambient Case RF1 8.7016 954.2634 m N/A RF2 17.0522 1.6818 N/A RF3 14.2584 1.4493 N/A RF4 53.5830 1.3030 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 373.6160 u 175.2301 u N/A CF2 4.2701 m 348.5475 u N/A CF3 80.7684 m 726.3561 u N/A CF4 1.4517 231.2620 u N/A 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: 70401 Revision 21-Mar-07 Si7214DN_RC Vishay Siliconix Document Number: 70401 Revision 21-Mar-07 www.vishay.com 3