Si7884DP_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 3.2817 72.1046 m N/A RT2 11.9526 927.9036 m N/A RT3 14.8374 387.7305 m N/A RT4 34.6359 412.3045 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 21.5367 m 5.3840 u N/A CT2 122.6730 m 14.7376 m N/A CT3 2.7978 46.2715 m N/A CT4 2.1250 9.7722 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: 73756 Revision 19-Jan-06 www.vishay.com 1 Si7884DP_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 2.9560 99.1476 m N/A RF2 11.2928 1.3512 N/A RF3 14.8335 250.9355 m N/A RF4 35.4453 100.2525 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 13.8361 m 346.3338 u N/A CF2 68.6573 m 5.3726 m N/A CF3 518.5476 m 39.3974 m N/A CF4 1.1877 27.2385 m 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: 73756 Revision 19-Jan-06 Si7884DP_RC Vishay Siliconix Document Number: 73756 Revision 19-Jan-06 www.vishay.com 3