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参数资料
| 型号： | TK73425TCB-G |
| 厂商： | TOKO INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.48 V DROPOUT, PDSO6 |
| 封装： | SOT89L-5, 6 PIN |
| 文件页数： | 11/22页 |
| 文件大小： | 296K |
| 代理商： | TK73425TCB-G |
TK734xxT
GC3-M001
Page 19
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
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
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
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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