Si4684DY-RC

Si4684DY_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
configuration are included. The corresponding values
for the Cauer/Filter configuration are available upon
request.
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
2.7730
RT1
5.4825
N/A
RT2
14.0940
N/A
5.6035
RT3
11.8997
N/A
12.5420
RT4
18.5795
N/A
6.9783
Junction to
Ambient
Case
Foot
CT1
8.6182 m
N/A
617.0550 µ
CT2
93.6547 m
N/A
18.1606 m
CT3
6.1489
N/A
73.2626 m
CT4
3.2294
N/A
9.1092 m
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:74111
Revision 14-Nov-05
www.vishay.com
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Si4684DY_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
4.0154
N/A
3.2171
RF2
9.4382
N/A
13.5708
RF3
8.0801
N/A
4.3045
RF4
28.4203
N/A
6.7275
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CF1
5.4161 m
N/A
475.8931 µ
CF2
37.1706 m
N/A
5.3294 m
CF3
176.0921 m
N/A
65.4259 m
CF4
1.9925
N/A
2.3240 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:74111
Revision 14-Nov-05
Si4684DY_RC
Vishay Siliconix
Document Number:74111
Revision 14-Nov-05
www.vishay.com
3