ip2005a International Rectifier Corp., ip2005a Datasheet - Page 10

• Manufacturer Part Number: ip2005a
• Description: High Frequency Synchronous Buck Optimized Lga Power Stage
• Manufacturer: International Rectifier Corp.

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1. Draw a line from Case Temperature axis to the PCB Temperature axis.
2. Draw a vertical line from the T
3. Draw a horizontal line from the intersection of the vertical line with the SOA curve to the
4. Draw a new vertical line from the T
5. Draw a horizontal line from the intersection of the new vertical line with the SOA curve to
The SOA adjustment indicates the part is still allowed to run at a continuous current of 36A.
Calculating SOA Temperature:
T
Assuming T
The following example shows how the SOA current is adjusted for T
X
axis intercept adjustment ≈ -1.2 ºC + 0.0 ºC + 0.6 ºC – 3.5 ºC ≈ -4.1 ºC
Y-axis (Output Current). The point at which the horizontal line meets the Y-axis is the
SOA continuous current.
temperature from the original T
the Y-axis (Output Current). The point at which the horizontal line meets the Y-axis is
the new SOA continuous current.
PCB
(Figure 3)
(Figure 4)
(Figure 5)
(Figure 6)
= 100ºC & T
L
F
V
V
OUT
V
SW
OUT
IN
DD
= 12.0V
= 300nH
= 1MHz
= 5.0V
= 1.3V
SOA temperature adjustment for input voltage ≈ -1.2ºC
SOA temperature adjustment for output voltage ≈ 0.0ºC
SOA temperature adjustment for output inductor ≈ 0.6 ºC
SOA temperature adjustment for switch frequency ≈ -3.5 ºC
CASE
= 110ºC
X
X
axis intercept to the SOA curve.
intercept point.
X
2/8/2008
axis by adding or subtracting the SOA adjustment
iP2005APbF
X
decrease of 4.1ºC
PD-60325
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