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PQ30VB11 bảng dữ liệu(PDF) 4 Page - Sharp Corporation

tên linh kiện PQ30VB11
Giải thích chi tiết về linh kiện  Variable Output Low Power-Loss Voltage Regulator(Built-in Overheat Shut-Down Function)
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nhà sản xuất  SHARP [Sharp Corporation]
Trang chủ  http://sharp-world.com/
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PQ30VB11 bảng dữ liệu(HTML) 4 Page - Sharp Corporation

  PQ30VB11 Datasheet HTML 1Page - Sharp Corporation PQ30VB11 Datasheet HTML 2Page - Sharp Corporation PQ30VB11 Datasheet HTML 3Page - Sharp Corporation PQ30VB11 Datasheet HTML 4Page - Sharp Corporation  
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PQ30VB11
Low Power-Loss Voltage Regulators
s Overheat Shut-down Characteristics
s ON/OFF Operation
VO
Tj
OFF
ON
VIN
*Tsd
* Tsd:Overheat shut-down temperature (Tj>=110˚C)
1 Overheat shut-down operates at Tj=Tsd and output OFF-state is maintained.
2 OFF-state is kept until VIN is once turned off.
VC
High : Output OFF
Low : Output ON
q
2
q
3
q
1
q
4
D2
R3
R1
R2
CO
+
VO
RL
VADJ
D1
CIN
VIN
R1
Equivalent Circuit
in OFF-state
R2
RL
D2
VO’
VADJ
RD
¡ON/OFF operation is available by mounting externally D2 and R3.
¡When VADJ is forcibly raised above Vref (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, VADJ must be higher then Vref MAX., and at the same time must be lower than
maximum rating 7V.
In OFF-state, the load current flows to RL from VADJ through R2. Therefore the value of R2 must be as high as possible.
¡VO'=VADJXRL/ (RL+R2)
occurs at the load. OFF-state equivalent circuit R1 up to 10k
Ω is allowed. Select as high value of RL and R2 as possible in this range.
In some case, as output voltage is getting lower (VO<1V), impedance of load resistance rises. In such condition, it is sometime
impossible to obtain the minimum value of VO'.So add the dummy resistance indicated by RD in the figure to the circuit parallel to the
load.



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