Si7892BDP_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 2.0964 1.3973 m N/A RT2 9.0489 689.3241 m N/A RT3 8.0177 1.2370 N/A RT4 50.6167 1.2901 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 24.2346 m 6.0624 m N/A CT2 558.4598 m 651.7211 µ N/A CT3 70.7118 m 17.1391 m N/A CT4 1.4427 6.2152 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: 73655 Revision 29-Nov-05 www.vishay.com 1 Si7892BDP_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 6.2138 1.0209 m N/A RF2 7.3478 876.2092 m N/A RF3 8.2835 1.2051 N/A RF4 47.8669 1.1158 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 16.9073 m 311.8376 µ N/A CF2 156.4948 m 235.5214 µ N/A CF3 4.5862 m 4.8481 m N/A CF4 1.2893 407.0005 µ 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: 73655 Revision 29-Nov-05 Si7892BDP_RC Vishay Siliconix Document Number: 73655 Revision 29-Nov-05 www.vishay.com 3