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| Si6968BEDQ_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 22.0425 33.2402 11.6883 53.0290 Ambient 54.9657 m 23.3037 m 1.6847 m 1.4307 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 23.5742 33.2557 10.4624 2.7077 Foot 58.2147 m 11.8325 m 3.0211 m 289.3372 u 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: 74847 Revision: 11-Jul-07 www.vishay.com 1 Si6968BEDQ_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 12.0591 26.1631 31.2811 50.4967 Ambient 1.3325 m 11.2274 m 15.0487 m 1.4432 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 4.6749 13.9626 19.6217 31.7408 Foot 311.5387 u 2.8693 m 3.6756 m 18.0470 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: 74847 Revision: 11-Jul-07 Si6968BEDQ_RC Vishay Siliconix Document Number: 74847 Revision: 11-Jul-07 www.vishay.com 3 |
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