Si7222DN_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 13.7825 111.2856 m N/A RT2 12.9707 75.3037 m N/A RT3 11.9353 1.8468 N/A RT4 55.1068 4.9734 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 11.0393 m 3.2549 u N/A CT2 106.1373 m 65.1010 m N/A CT3 668.0599 u 298.0335 u N/A CT4 1.5189 969.2977 u 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: 74826 Revision: 20-Jul-07 www.vishay.com 1 Si7222DN_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 8.7490 2.0666 N/A RF2 17.1611 1.8487 N/A RF3 14.3379 1.6172 N/A RF4 53.5978 1.4820 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 332.8221 u 177.2253 u N/A CF2 4.4938 m 338.2322 u N/A CF3 80.9716 m 697.8168 u N/A CF4 1.4821 690.0406 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: 74826 Revision: 20-Jul-07 Si7222DN_RC Vishay Siliconix Document Number: 74826 Revision: 20-Jul-07 www.vishay.com 3