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參數(shù)資料
| 型號： | IRU431LCS |
| 英文描述： | VOLT REGULATOR|ADJUSTABLE|+1.24 TO +15V|BIPOLAR|SOP|8PIN|PLASTIC |
| 中文描述： | 電壓調(diào)節(jié)器|調(diào)節(jié)| 1.24至15V |雙極|?？苵 8引腳|塑料 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大小： | 93K |
| 代理商： | IRU431LCS |
IRU431L / IRU431AL
5
Rev. 1.5
07/13/01
In our previous example, the maximum power dissipa-
tion of the device is calculated under no load and maxi-
mum input supply condition.
The maximum power is calculated using the following
equation:
V
MAX
- V
KA
R
B
As shown in the power dissipation table, both packages
can handle this power dissipation.
The table below summarizes the maximum power dissi-
pation capability of each package versus ambient tem-
perature.
Ambient Temperature (Ta) -
°
C
Pkg 25 40 50 60 70
8-Pin SOIC 775mW
682mW
SOT-23
150mW
132mW
620mW
120mW
558mW
108mW
496mW
96mW
P
MAX
= V
KA
×
o
p
Where:
P
MAX
= Maximum power dissipation of the 431L
For our example:
P
MAX
= 3.3
×
o
p
= 89mW
6 - 3.3
100
Stability
The IRU431L has many different domains of stability as
a function of the cathode current. As is typical of three-
terminal shunt regulators, the IRU431L has many do-
mains of stability. The actual domain in which any prac-
tical circuit operates is related to cathode current. In
general the device will be unconditionally stable for any
cathode current if a capacitor, 1
μ
F or larger, is connected
between the cathode and the anode. If the cathode cur-
rent is always higher than 3mA under minimum line and
maximum load conditions, the capacitor value can be
reduced to 0.01
μ
F and the system will be stable.
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