SiZ700DT_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. R-C values for the electrical circuit in the Foster/Tank and Cauer/Filter configurations are included. When implemented in P-Spice, these values have matching characteristic curves to the single-pulse transient thermal impedance curves for the MOSFET. These RC values can be used in the P-SPICE simulation to evaluate the thermal behavior of the MOSFET junction temperature under a defined power profile. These techniques are described in Application Note AN609, "Thermal Simulation of Power MOSFETs on the P-Spice Platform." R-C THERMAL MODEL FOR TANK CONFIGURATION R-C VALUES FOR TANK CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient CH-1 Ambient CH-2 Case CH-1 Case CH-2 RT1 18.7782 21.2358 719.3808 m 431.7870 m RT2 5.5394 5.2959 3.5404 2.2916 RT3 21.3889 17.4498 945.5192 m 662.7130 m RT4 44.2935 41.0185 1.8947 1.2139 Thermal Capacitance (Joules/°C) Junction to Ambient CH-1 Ambient CH-2 Case CH-1 Case CH-2 CT1 9.4822 m 29.2501 m 1.9498 m 18.1402 m CT2 671.5252 u 4.4079 m 7.2565 m 21.7015 m CT3 107.2256 m 499.0944 m 163.9561 u 391.1266 u CT4 1.5017 1.8621 2.1310 m 13.2292 m 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: 64749 Revision: 06-Feb-09 www.vishay.com 1 SiZ700DT_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient CH-1 Ambient CH-2 Case CH-1 Case CH-2 RF1 7.9487 5.9283 1.1847 552.8873 m RF2 25.6968 20.9732 1.6396 2.2431 RF3 21.3108 21.8432 1.5602 527.3127 m RF4 35.0437 36.2553 2.7155 1.2767 Thermal Capacitance (Joules/°C) Junction to Ambient CH-1 Ambient CH-2 Case CH-1 Case CH-2 CF1 874.0697 u 3.1483 m 122.5962 u 249.9928 u CF2 12.2432 m 20.7628 m 828.4264 u 4.2109 m CF3 235.5351 m 270.2771 m 366.3302 u 14.4287 m CF4 1.8585 1.6348 8.5275 m 8.1428 m Note NA indicates not applicable www.vishay.com 2 Document Number: 64749 Revision: 06-Feb-09 SiZ700DT_RC Vishay Siliconix Document Number: 64749 Revision: 06-Feb-09 www.vishay.com 3 SiZ700DT_RC Vishay Siliconix www.vishay.com 4 Document Number: 64749 Revision: 06-Feb-09