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AP1155ADU Datasheet(PDF) 18 Page - Asahi Kasei Microsystems

Part No. AP1155ADU
Description  15V Input / 1A Output Adjustable Voltage LDO Regulator
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Maker  AKM [Asahi Kasei Microsystems]
Homepage  http://www.akm.com
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AP1155ADU Datasheet(HTML) 18 Page - Asahi Kasei Microsystems

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[AP1155ADU]
Rev.0.0
- 18 -
2014/07
・P
D is easily calculated.
With the output terminal shorted-circuited to GND, gradually increase the input voltage and measure the input
current. Slowly increase the input voltage to about 10V. The initial input current value becomes the maximum
instantaneous output current value, but gradually lowers as the chip temperature rises, and ultimately reaches
a state of thermal equilibrium (through natural air cooling). PD is calculated using the input value for input
current and the input voltage value in the equilibrium state.
In
In
D
I
V
P
0
25
50
75
100
145
T
a (°C)
P
D (mW)
P
D
DP
D
2
3
4
5
Procedure
(conducted at the time of installation on PCB)
1: Obtain PD (
In
In
I
V 
when output is short-circuited).
2: Plot PD on the 25C line.
3: Draw a straight line between PD and the 145C line.
4: Extend a straight-line perpendicular from the point of
the designed maximum operating temperature (for
example, 75C).
5: Extend a line to the left from the intersection of the
derating curve and the line drawn in 4, and read the PD
value (this value is DPD).
6:
Out
Out
MAX
In,
D
I
)
V
(V
DP
at 75C
The maximum operating current at the maximum temperature is as follows:
)}
V
(V
{DP
I
Out
MAX
In,
D
Out
Try to achieve maximum heat dissipation in your design in order to minimize the part’s temperature during
operation. Generally speaking, lower part temperatures result in higher reliability in operation.


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