Si4190DY_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, “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 CT4 T (Ambient) R-C VALUES FOR TANK CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case Foot RT1 21.5961 N/A 5.0589 RT2 3.0023 N/A 5.9266 RT3 22.3777 N/A 4.7965 RT4 33.0239 N/A 218.0000 m Junction to Ambient Case Foot CT1 2.1861 N/A 423.4357 m THERMAL CAPACITANCE (Joules/°C) CT2 22.3442 m N/A 123.5962 m CT3 55.3654 m N/A 14.9315 m CT4 3.0214 N/A 3.5309 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: 70652 Revision: 19-May-10 www.vishay.com 1 Si4190DY_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 3.0181 N/A 452.4000 m RF2 22.2313 N/A 6.4187 RF3 20.3404 N/A 7.5636 RF4 34.4102 N/A 1.5653 THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CF1 7.9839 m N/A 3.2376 m CF2 36.2109 m N/A 10.6658 m CF3 885.9636 m N/A 110.9308 m CF4 1.0250 N/A 1.1075 Note • N/A indicates not applicable www.vishay.com 2 Document Number: 70652 Revision: 19-May-10 Si4190DY_RC Vishay Siliconix Document Number: 70652 Revision: 19-May-10 www.vishay.com 3