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| Si4496DY_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 2.3490 29.5589 32.0670 26.1202 Ambient 1.1969 m 32.0544 m 1.4071 3.6901 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 250.9288 m 6.7329 9.1880 1.7701 Foot 563.0696 13.6449 m 174.2752 m 4.8071 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: 74109 Revision 02-Sep-05 www.vishay.com 1 Si4496DY_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 6.0619 27.5447 30.8157 25.6209 Ambient 5.6116 m 32.7967 m 843.7170 m 1.4531 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 2.5758 7.3337 4.1168 3.9913 Foot 2.6100 m 9.5520 m 193.9091 m 2.2668 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: 74109 Revision 02-Sep-05 Si4496DY_RC Vishay Siliconix Document Number: 74109 Revision 02-Sep-05 www.vishay.com 3 |
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