Si4564DY_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 Channel 1 Ambient Channel 2 Foot Channel 1 Foot Channel 2 RT1 8.8119 5.8332 13.7750 11.0076 RT2 25.4469 25.7315 12.4374 14.0113 RT3 22.8160 23.6280 3.5700 2.2027 RT4 62.9252 54.8073 10.2176 10.7784 Junction to Ambient Channel 1 Ambient Channel 2 Foot Channel 1 Foot Channel 2 CT1 946.2768 u 3.2768 m 104.8122 m 186.2093 m CT2 20.2070 m 9.4656 m 20.7745 m 15.8855 m CT3 62.8463 m 84.7284 m 357.6399 u 917.1032 u CT4 1.1064 1.2331 4.8035 m 5.6942 m THERMAL CAPACITANCE (Joules/°C) 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: 65741 Revision: 07-Apr-10 www.vishay.com 1 Si4564DY_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION T (Junction) RF2 RF1 CF2 CF1 RF3 CF3 RF4 T (Ambient) CF4 GND R-C VALUES FOR FILTER CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Channel 1 Ambient Channel 2 Foot Channel 1 RF1 7.4554 6.9305 4.1451 Foot Channel 2 3.9916 RF2 21.7741 26.6656 15.3082 18.9931 RF3 31.1664 25.8544 15.0155 10.4816 RF4 59.6041 50.5495 5.5312 4.5337 THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Channel 1 Ambient Channel 2 Foot Channel 1 Foot Channel 2 CF1 730.6810 u 1.3377 m 340.2531 u 1.0522 m CF2 7.7933 m 6.1285 m 3.2045 m 3.4581 m CF3 30.2777 m 62.6347 m 27.3149 m 46.7552 m CF4 1.1427 1.3009 208.4042 m 609.9337 m Note N/A indicates not applicable www.vishay.com 2 Document Number: 65741 Revision: 07-Apr-10 Si4564DY_RC Vishay Siliconix Document Number: 65741 Revision: 07-Apr-10 www.vishay.com 3 Si4564DY_RC Vishay Siliconix www.vishay.com 4 Document Number: 65741 Revision: 07-Apr-10