AN609 View Datasheet(PDF) - Vishay Semiconductors
Part Name
Description
Manufacturer
AN609 Datasheet PDF : 9 Pages
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AN609
Vishay Siliconix
NEW PRODUCT SI7390DP N-CHANNEL 30-V (D-S) FAST SWITCHING WFET®
THERMAL RESISTANCE RATINGS
Parameter
Maximum Junction-to Ambient (MOSFET)a
t ≤ 10 sec
Steady State
Maximum Junction-to-Case (Drain)
Steady State
Notes
a. Surface Mounted on 1“ x 1“ FR4 Board
Symbol
RthJA
RthJC
Typical
20
53
2.1
Normalized Thermal Transient Impedance, Junction-to-Ambient
2
1
Duty Cycle = 0.5
Maximum
25
70
3.2
Unit
*C / W
0.2
0.1
0.1
0.05
0.02
0.01
10–4
Single Pulse
10–3
10–2
10–1
1
Square Wave Pulse Duration (sec)
Notes:
PDM
t1
t2
1. Duty Cycle, D =
t1
t2
2. Per Unit Base = RthJA = 125• C/W
3. TJM – TA = PDMZthJA(t)
4. Surface Mounted
10
100
600
Normalized Thermal Transient Impedance, Junction-to-Case
2
1
Duty Cycle = 0.5
0.2
0.1
0.1
0.05
0.02
Single Pulse
0.01
10–4
10–3
10–2
10–1
1
Square Wave Pulse Duration (sec)
Figure: 1: Datasheet Information
R-C THERMAL MODELS
Two configurations of R-C thermal models offered on
the Vishay Web site are a "tank" circuit, Figure 2, and
a "filter" circuit, Figure 3. These configurations are also
known as Cauer and Foster. Both models are devel-
oped using the same database of transient thermal
characteristics with curve -fitting techniques, hence
closely matching thermal analysis results are obtained.
www.vishay.com
2
Document Number 73554
07-Oct-05
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