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| Si4856ADY_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 2.0053 20.8011 28.2729 28.8060 Ambient 1.6405 m 24.4894 m 358.8053 m 2.5583 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 468.2017 m 4.8276 7.4177 5.9020 Foot 2.0074 m 39.9180 m 189.7165 m 11.7115 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:74114 Revision 14-Nov-05 www.vishay.com 1 Si4856ADY_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 1.3054 24.3531 34.9946 19.2364 Ambient 263.0147 19.8868 m 325.1676 m 3.6944 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 3.1425 8.7149 3.5588 3.1301 Foot 4.8377 m 7.2041 m 168.4432 m 17.9200 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:74114 Revision 14-Nov-05 Si4856ADY_RC Vishay Siliconix Document Number:74114 Revision 14-Nov-05 www.vishay.com 3 |
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