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PQ30RV31 Datasheet(PDF) 4 Page - Sharp Electrionic Components

No. de Pieza. PQ30RV31
Descripción  Variable Output Low Power-Loss Voltage Regulator
Descarga  5 Pages
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Fabricante  SHARP [Sharp Electrionic Components]
Página de inicio  http://sharp-world.com/
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PQ30RV31 Datasheet(HTML) 4 Page - Sharp Electrionic Components

   
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Low Power-Loss Voltage Regulators
PQ30RV31
s ON/OFF Operation
Fig.11 Ripple Rejection vs. Input Ripple
Frequency
–25
100
75
50
25
0
4
4.5
5
5.5
6
7
6.5
VIN=15V,R1=390
Ω,R2=2.7kΩ
Dropout voltage Vi–O (V)
VC
High : Output OFF
Low : Output ON
D2
R3
R1
R2
CO
+
VO
RL
VADJ
D1
CIN
VIN
R1
Equivalent Circuit
in OFF-state
R2
RL
D2
VO'
VADJ
RD
1
2
4
3
q
ON/OFF operation is available by mounting externally D2 and R3.
q
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.
q
VO'=VADJ✕RL/(RL+R2)
occurs at the load. OFF-state equivalent circuit R1 up to 10k
Ω is allowed. Select as high value of RLand 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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