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| Si4684DY_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 configuration are included. The corresponding values for the Cauer/Filter configuration are available upon request. 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 5.4825 14.0940 11.8997 18.5795 Ambient 8.6182 m 93.6547 m 6.1489 3.2294 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 2.7730 5.6035 12.5420 6.9783 Foot 617.0550 18.1606 m 73.2626 m 9.1092 m 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:74111 Revision 14-Nov-05 www.vishay.com 1 Si4684DY_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 4.0154 9.4382 8.0801 28.4203 Ambient 5.4161 m 37.1706 m 176.0921 m 1.9925 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 3.2171 13.5708 4.3045 6.7275 Foot 475.8931 5.3294 m 65.4259 m 2.3240 m 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:74111 Revision 14-Nov-05 Si4684DY_RC Vishay Siliconix Document Number:74111 Revision 14-Nov-05 www.vishay.com 3 |
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