Si4943CDY AN609 - Datasheet Archive

Vishay Siliconix R-C Thermal Model Parameters DESCRIPTION The parametric values in the R-C thermal model have been derived using

Si4943CDY Si4943CDY_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 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 Case Foot RT1 9.7553 N/A 11.1535 RT2 52.4724 N/A 2.1851 RT3 25.8042 N/A 7.0396 RT4 21.9681 N/A 19.6218 Junction to Ambient Case CT1 3.5356 m N/A 8.5212 m CT2 1.2614 N/A 566.4423 u CT3 62.2281 m N/A 10.5065 m CT4 24.3414 m N/A 43.8971 m Thermal Capacitance (Joules/°C) Foot 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: 68654 Revision: 11-Apr-08 www.vishay.com 1 Si4943CDY Si4943CDY_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient Case Foot RF1 6.9593 N/A 3.3889 RF2 23.3267 N/A 17.8419 RF3 31.0539 N/A 7.1851 RF4 48.6601 N/A 11.5841 Junction to Ambient Case Foot CF1 2.0809 m N/A 935.0013 u CF2 6.3968 m N/A 3.0562 m CF3 37.9288 m N/A 18.2931 m CF4 1.3866 N/A 39.5758 m Thermal Capacitance (Joules/°C) Note: NA indicates not applicable www.vishay.com 2 Document Number: 68654 Revision: 11-Apr-08 Si4943CDY Si4943CDY_RC Vishay Siliconix Document Number: 68654 Revision: 11-Apr-08 www.vishay.com 3