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| Si5484DU_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 RT1 RT2 RT3 RT4 Junction to CT1 CT2 CT3 CT4 Ambient 5.5431 19.4536 15.0558 48.9104 Ambient 2.1071 m 13.3151 m 178.1933 m 1.4793 Case 28.8945 m 1.1108 1.4224 1.4419 Case 686.5381 u 190.7991 u 1.3230 m 1.2716 m Foot N/A N/A N/A N/A Foot N/A N/A N/A N/A Thermal Capacitance (Joules/C) 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: 73728 Revision 13-Jan-06 www.vishay.com 1 Si5484DU_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (C/W) Junction to RF1 RF2 RF3 RF4 Junction to CF1 CF2 CF3 CF4 Note: NA indicates not applicable Ambient 6.1642 22.2142 16.1658 44.3978 Ambient 1.4684 m 10.2828 m 190.2917 m 1.4192 Case 1.7953 1.4822 571.1917 m 150.0745 m Case 145.1296 u 578.5153 u 867.6748 u 38.2575 u Foot N/A N/A N/A N/A Foot N/A N/A N/A N/A Thermal Capacitance (Joules/C) 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: 73728 Revision 13-Jan-06 Si5484DU_RC Vishay Siliconix Document Number: 73728 Revision 13-Jan-06 www.vishay.com 3 |
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