SQM120N06-06_RC www.vishay.com 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 RT1 11.9104 147.0210m Foot N/A RT2 3.1921 180.8994m N/A RT3 931.0189m 195.2321m N/A RT4 23.9695 121.8420m N/A THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CT1 8.2562 5.0499m N/A CT2 1.0641 19.8981m N/A CT3 147.3202m 49.1524m N/A CT4 4.0108 635.8832m N/A 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. Revision: 16-Jun-11 1 Document Number: 63343 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQM120N06-06_RC www.vishay.com Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION T (Junction) RF2 RF1 CF1 RF3 CF2 RF4 T (Ambient) CF4 CF3 GND R-C VALUES FOR FILTER CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case RF1 884.7234m 264.7714m Foot N/A RF2 6.5762 195.8529m N/A RF3 23.1425 134.0983m N/A RF4 9.4830 55.2774m N/A Junction to Ambient Case Foot CF1 24.3391m 3.6743m N/A CF2 882.6174m 16.8281m N/A CF3 1.7594 103.8342m N/A CF4 2.6137 1.3708 N/A THERMAL CAPACITANCE (Joules/°C) Note • n/a indicates not applicable Revision: 16-Jun-11 2 Document Number: 63343 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQM120N06-06_RC www.vishay.com Revision: 16-Jun-11 Vishay Siliconix 3 Document Number: 63343 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000