PQ30RV31 Просмотр технического описания (PDF) - Sharp Electronics
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PQ30RV31 Datasheet PDF : 5 Pages
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Low Power-Loss Voltage Regulators
Fig.11 Ripple Rejection vs. Input Ripple
Frequency
7
6.5
6
5.5
5
4.5
VIN=15V,R1=390Ω,R2=2.7kΩ
4
–25 0
25 50 75 100
Dropout voltage Vi–O (V)
PQ30RV31
s ON/OFF Operation
D1
VIN
1
2
VO
R2
D2
4
+
CIN
3
VADJ R1
R3
CO
RL
VADJ
D2
R2
R1
RL
RD
VO'
High : Output OFF
VC
Low : Output ON
Equivalent Circuit
in OFF-state
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 10kΩ 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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