Si3981DV-RC

Si3981DV_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
Ambient
Case
Foot
RT1
11.5878
N/A
23.4402
RT2
45.4875
N/A
10.9620
RT3
48.3286
N/A
19.4430
RT4
49.5961
N/A
41.1548
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CT1
260.7413 u
N/A
1.5649 m
CT2
1.3706 m
N/A
214.4767 u
CT3
11.2286 m
N/A
58.1757 m
CT4
1.6583
N/A
2.9908 m
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: 74814
Revision: 19-Jul-07
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Si3981DV_RC
Vishay Siliconix
R-C THERMAL MODEL FOR FILTER CONFIGURATION
R-C VALUES FOR FILTER CONFIGURATION
Thermal Resistance (°C/W)
Junction to
Ambient
Case
Foot
RF1
17.0836
N/A
17.5427
RF2
47.3090
N/A
43.3715
RF3
41.2460
N/A
24.0470
RF4
49.3614
N/A
10.0388
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CF1
229.5149 u
N/A
188.2622 u
CF2
1.0029 m
N/A
968.0053 u
CF3
9.9194 m
N/A
5.7792 m
CF4
1.6273
N/A
160.3470 m
Note: NA indicates not applicable
Reference:
[1] "A Simple Method of Generating Thermal Models for a Power MOSFET" by Wharton McDaniel and Kandarp Pandya, IEEE / SEMITHERM 2002
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Document Number: 74814
Revision: 19-Jul-07
Si3981DV_RC
Vishay Siliconix
Document Number: 74814
Revision: 19-Jul-07
www.vishay.com
3