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IP2005CTRPBF Datasheet(PDF) 9 Page - International Rectifier

Part # IP2005CTRPBF
Description  Synchronous Buck Optimized LGA Power Block
PDF  15 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IP2005CTRPBF Datasheet(HTML) 9 Page - International Rectifier

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www.irf.com
04/09/2009
9
iP2005CPbF
PD-60360
Calculating SOA Temperature
:
(Figure 3) SOA temperature adjustment for input voltage
≈ -0.6ºC
(Figure 5) SOA temperature adjustment for output inductor
≈ 0.25 ºC
(Figure 6) SOA temperature adjustment for switch frequency
≈ -2.5 ºC
TX axis intercept adjustment ≈ -0.6 ºC + 0.25 ºC – 2.5 ºC ≈ -2.9 ºC
Assuming TPCB = 100ºC & TCASE = 110ºC, the following example shows how the SOA current is
adjusted for TX decrease of 2.8 ºC
0
4
8
12
16
20
24
28
32
36
40
44
0
102030
4050
60708090
100
110
120
130
PCB Temperature (ºC)
0
102030
4050
60708090
100
110
120
130
VI = 12V
VD = 5.0V
VO = 1.3V
Fsw = 1MHz
LO = 300nH
Tx
Case Temperature (ºC)
Safe
Operating
Area
1
2
3
4
5
0
4
8
12
16
20
24
28
32
36
40
44
0
102030
4050
60708090
100
110
120
130
PCB Temperature (ºC)
0
102030
4050
60708090
100
110
120
130
VI = 12V
VD = 5.0V
VO = 1.3V
Fsw = 1MHz
LO = 300nH
Tx
Case Temperature (ºC)
Safe
Operating
Area
11
22
33
44
55
1. Draw a line from Case Temperature axis to the PCB Temperature axis.
2. Draw a vertical line from the TX axis intercept to the SOA curve.
3. Draw a horizontal line from the intersection of the vertical line with the SOA curve to the Y-axis
(Output Current).
The point at which the horizontal line meets the Y-axis is the SOA
continuous current.
4. Draw a new vertical line from the TX axis by adding or subtracting the SOA adjustment
temperature from the original TX intercept point.
5.
Draw a horizontal line from the intersection of the new vertical line with the SOA curve to the
Y-axis (Output Current). The point at which the horizontal line meets the Y-axis is the new
SOA continuous current.
The SOA adjustment indicates the part is still allowed to run at a continuous current of 39A.



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