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參數(shù)資料
| 型號： | PQ30VB11 |
| 廠商： | Sharp Corporation |
| 英文描述： | Variable Output Low Power-Loss Voltage Regulator(Built-in Overheat Shut-Down Function) |
| 中文描述： | 可變輸出低功率損耗的穩(wěn)壓器（內(nèi)置過熱關機功能） |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 35K |
| 代理商： | PQ30VB11 |
PQ30VB11
Low Power-Loss Voltage Regulators
I
Overheat Shut-down Characteristics
I
ON/OFF Operation
V
O
T
j
OFF
ON
V
IN
*Tsd
* Tsd:Overheat shut-down temperature (T
j
>=110C)
1 Overheat shut-down operates at T
j=
Tsd and output OFF-state is maintained.
2 OFF-state is kept until V
IN
is once turned off.
V
C
High : Output OFF
Low : Output ON
G
2
G
3
G
1
G
4
D
2
R
3
R
1
R
2
C
O
+
V
O
R
L
V
ADJ
D
1
C
IN
V
IN
R
1
Equivalent Circuit
in OFF-state
R
2
R
L
D
2
V
O
’
V
ADJ
R
D
ON/OFF operation is available by mounting externally D
2
and R
3
.
When V
ADJ
is forcibly raised above V
ref
(1.25V TYP) by applying the external signal, the output is turned off(pass transistor of
regulator is turned off). When the output is OFF, V
ADJ
must be higher then V
ref
MAX., and at the same time must be lower than
maximum rating 7V.
In OFF-state, the load current flows to R
L
from V
ADJ
through R
2
. Therefore the value of R
2
must be as high as possible.
V
O
'=V
ADJ
X
R
L
/ (R
L
+R
2
)
occurs at the load. OFF-state equivalent circuit R
1
up to 10k
is allowed. Select as high value of R
L
and R
2
as possible in this range.
In some case, as output voltage is getting lower (V
O
<1V), impedance of load resistance rises. In such condition, it is sometime
impossible to obtain the minimum value of V
O
'.So add the dummy resistance indicated by R
D
in the figure to the circuit parallel to the
load.
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