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| 型号： | IRDCIP2005A-A |
| 厂商： | International Rectifier |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO SYNC DUAL BUCK CNVTER |
| 标准包装： | 1 |
| 系列： | * |
PD-60325
i P2005APbF
Calculating SOA Temperature:
(Figure 3)
(Figure 4)
(Figure 5)
(Figure 6)
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
T X axis intercept adjustment ≈ -1.2 oC + 0.0 oC + 0.6 oC – 3.5 oC ≈ -4.1 oC
Assuming T PCB = 100oC & T CASE = 110oC
The following example shows how the SOA current is adjusted for T X decrease of 4.1oC
V IN = 12.0V
V DD = 5.0V
V OUT = 1.3V
F SW = 1MHz
L OUT = 300nH
1. Draw a line from Case Temperature axis to the PCB Temperature axis.
2. Draw a vertical line from the T X 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 T X axis by adding or subtracting the SOA adjustment
temperature from the original T X 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 36A.
www.irf.com
2/8/2008
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