AN609 Vishay Siliconix R-C Thermal Model Parameters DESCRIPTION The parametric values - Datasheet Archive

 

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

 

SiM400_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 T (Junction) RT1 RT2 RT3 RT4 CT1 CT2 CT3 T (Ambient) CT4 R-C VALUES FOR TANK CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case Foot RT1 35.0216 N/A 19.7863 RT2 31.3061 N/A 28.0556 RT3 54.9147 N/A 15.9985 RT4 28.7575 N/A 1.3026 THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CT1 967.7828 m N/A 300.5445 u 138.5965 u CT2 6.3053 m N/A CT3 214.7376 u N/A 15.3236 u CT4 20.7362 u N/A 58.4268 m Note N/A indicates not applicable This document is intended as a SPICE modeling guideline and does not constitute a commercial product datasheet. Designers should refer to the appropriate datasheet of the same number for guaranteed specification limits. Document Number: 65926 Revision: 10-Feb-10 www.vishay.com 1 SiM400_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION T (Junction) RF2 RF1 CF1 CF2 RF3 RF4 T (Ambient) CF4 CF3 GND R-C VALUES FOR FILTER CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case Foot RF1 36.6171 N/A 20.4794 RF2 55.2172 N/A 43.5980 RF3 23.9488 N/A 720.0233 m RF4 34.2169 N/A 202.5767 m THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CF1 19.8788 u N/A 13.0067 u CF2 246.3045 u N/A 90.9913 u CF3 10.7808 m N/A 180.4648 m CF4 980.1167 m N/A 26.8655 m Note N/A indicates not applicable www.vishay.com 2 Document Number: 65926 Revision: 10-Feb-10 SiM400_RC Vishay Siliconix Document Number: 65926 Revision: 10-Feb-10 www.vishay.com 3