SQJ461EP_RC

SQJ461EP_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
RT1
3.0336
23.4722 m
Foot
N/A
RT2
9.3314
688.2031 m
N/A
RT3
6.2693
1.8758
N/A
RT4
51.8152
911.2786 m
N/A
Junction to
Ambient
Case
CT1
12.0631 m
1.3636 m
N/A
CT2
304.0603 m
1.2578 m
N/A
CT3
73.5835 m
9.8360 m
N/A
CT4
1.2863
8.1431 m
N/A
THERMAL CAPACITANCE (Joules/°C)
Foot
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: 66568
Revision: 05-Mar-10
www.vishay.com
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SQJ461EP_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
5.4827
12.6762 u
N/A
RF2
9.9545
1.1822
N/A
RF3
17.5487
1.2928
N/A
RF4
37.4972
1.0216
N/A
THERMAL CAPACITANCE (Joules/°C)
Junction to
Ambient
Case
Foot
CF1
10.1325 m
379.2088 u
N/A
CF2
73.9415 m
564.0357 u
N/A
CF3
480.6324 m
5.0549 m
N/A
CF4
1.2577
869.8118 u
N/A
Note
N/A indicates not applicable
www.vishay.com
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Document Number: 66568
Revision: 05-Mar-10
SQJ461EP_RC
Vishay Siliconix
Document Number: 66568
Revision: 05-Mar-10
www.vishay.com
3