www.DataSheet4U.com
Si5484DU_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. These techniques are described in "A Simple Method of Generating Thermal Models for a Power MOSFET"[1]. When implemented in P-Spice, these values have matching characteristic curves to the Single Pulse Transient Thermal Impedance curves for the MOSFET.
R-C values for the electrical circuit in the Foster/Tank and Cauer/Filter configurations are included.
Note:
For a detailed explanation of implementing these values in P-SPICE, refer to Application Note AN609 Thermal Simulations Of Power MOSFETs on P-SPICE Platform.
R-C THERMAL MODEL FOR TANK CONFIGURATION
R-C VALUES FOR TANK CONFIGURATION
Thermal Resistance (°C/W) Junction to RT1 RT2 RT3 RT4 Junction to CT1 CT2 CT3 CT4 Ambient 5.5431 19.4536 15.0558 48.9104 Ambient 2.1071 m 13.3151 m 178.1933 m 1.4793 Case 28.8945 m 1.1108 1.4224 1.4419 Case 686.5381 u 190.7991 u 1.3230 m 1.2716 m Foot N/A N/A N/A N/A Foot N/A N/A N/A N/A
Thermal Capacitance (Joules/°C)
This document is intended as a SPICE modeling guideline and does not constitute a commercial product data sheet. Designers should refer to the appropriate data sheet of the same number for guaranteed specification limits.
Document Number: 73728 Revision 13-Jan-06
www.vishay.com 1
Si5484DU_RC
Vishay Siliconix
R-C THERMAL MODEL FOR FILTER CONFIGURATION
R-C VALUES FOR FILTER CONFIGURATION
Thermal Resistance (°C/W) Junction to RF1 RF2 RF3 RF4 Junction to CF1 CF2 CF3 CF4
Note: NA indicates not applicable
Ambient 6.1642 22.2142 16.1658 44.3978 Ambient 1.4684 m 10.2828 m 190.2917 m 1.4192
Case 1.7953 1.4822 571.1917 m 150.0745 m Case 145.1296 u 578.5153 u 867.6748 u 38.2575 u
Foot N/A N/A N/A N/A Foot N/A N/A N/A N/A
Thermal Capacitance (Joules/°C)
Reference: [1] "A Simple Method of Generating Thermal Models for a Power MOSFET" by Wharton McDaniel and Kandarp Pandya, IEEE / SEMITHERM 2002
www.vishay.com 2
Document Number: 73728 Revision 13-Jan-06
Si5484DU_RC
Vishay Siliconix
Document Number: 73728 Revision 13-Jan-06
www.vishay.com 3
