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參數(shù)資料
| 型號： | AN8031 |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Active filter control IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 205K |
| 代理商： | AN8031 |
10
AN8031
Voltage Regulators
I
Application Notes (continued)
[2] Operation descriptions (continued)
1. Normal control (continued)
3) Description of each function (continued)
(1)
V
B
(continued)
<Setting the V
B
terminal constant>
Regulation by clamper in/out-current value
The allowable output current of the upper
limit voltage clamper is
5 mA and the allow-
able input current of the lower limit voltage
clamper is
+
5 mA.
Either one of these allowable values is ex-
ceeded, the voltage clamp operation of the V
B
terminal is not guaranteed. Therefore, R
B
should
be set so that these values are not exceeded.
Consumption current and delay
When the R
B
value is too large, the V
B
threshold could be exceeded. When the R
B
value
is too small, the consumption current becomes
too large.
In order to determine the R
B
value prop-
erly, the input voltage range and the dispersion
of components should be taken into consider-
ation and it should be confirmed that a stable
operation can be ensured under start/overload
conditions or under a small load condition.
I
D
SDB
V
lower limit
voltage clamp
current
V
upper limit
voltage clamp
current
Clamp upper
limit voltage
Time
Time
Lower limit
voltage clamp
Upper limit
voltage clamp
V
B
V
B
threshold value
V
B
V
CC
AN8031
GND
Figure 5. Explanation of V
B
operation
V
B
I
D
I
DS
I
DS
Clamp upper
limit voltage
Reset operation
of inductor
AN8031
±
5 mA or less
V
B
R
B
R
B
too large
:
Consumption current becomes small, however,
T
OFF
is extended by the delay amount because of low speed.
R
too small
:
Speed is high, however, consumption current
is small and undershoot tends to be generated easily.
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