SQD15N06-42L_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 1.4498 920.6084m N/A RT2 29.6544 1.3167 N/A RT3 11.7613 1.1059 N/A RT4 6.7669 1.1708 N/A Junction to Ambient Case Foot CT1 2.0337m 1.3139 N/A CT2 1.8428 6.5196m N/A CT3 604.6069m 70.5420m N/A CT4 41.6849m 653.7104u N/A 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: 67454 Revision: 03-Jan-11 www.vishay.com 1 SQD15N06-42L_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 3.3161 1.1720 N/A RF2 8.5954 1.2052 N/A RF3 16.9972 1.0158 N/A RF4 20.6600 1.0710 N/A THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case CF1 6.0642m 503.9403u Foot N/A CF2 72.1314m 3.4649m N/A CF3 520.8259m 28.2813m N/A CF4 1.7643 599.1817m N/A Note N/A indicates not applicable www.vishay.com 2 Document Number: 67454 Revision: 03-Jan-11 SQD15N06-42L_RC Vishay Siliconix Document Number: 67454 Revision: 03-Jan-11 www.vishay.com 3