ip2005a International Rectifier Corp., ip2005a Datasheet - Page 8

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

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Applying the Safe Operating Area (SOA) Curve
The SOA graph incorporates power loss and thermal resistance information in a way that
1.Calculate (based on estimated Power Loss) or measure the Case temperature on the
2.Draw a line from Case Temperature axis to the PCB Temperature axis.
3.Draw a vertical line from the T
4.Draw a horizontal line from the intersection of the vertical line with the SOA curve to the Y-
allows one to solve for maximum current capability in a simplified graphical manner. It
incorporates the ability to solve thermal problems where heat is drawn out through the
printed circuit board and the top of the case. Please refer to International Rectifier
Application Note AN1047 for further details on using this SOA curve in your thermal
environment.
Procedure
device and the Board temperature near the device (1mm from the edge).
axis (Output Current). The point at which the horizontal line meets the Y-axis is the SOA
continuous current.
Figure 10 SOA Example, Continuous current ≈ 31A for T
L
F
V
V
OUT
V
SW
OUT
IN
DD
= 12.0V
= 1MHz
= 300nH
= 5.0V
= 1.3V
X
axis intercept to the SOA curve.
2/8/2008
PCB
= 100ºC & T
iP2005APbF
CASE
= 110ºC
PD-60325
8