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PQ7RV4 Datasheet(PDF) 4 Page - Sharp Electrionic Components

No. de Pieza. PQ7RV4
Descripción  Variable Output(1.5 to 7V), 4.6A Output Low Power-loss Voltage Regulator
Descarga  6 Pages
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Fabricante  SHARP [Sharp Electrionic Components]
Página de inicio  http://sharp-world.com/
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PQ7RV4 Datasheet(HTML) 4 Page - Sharp Electrionic Components

   
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Low Power-Loss Voltage Regulators
PQ7RV4
Cref
390
to 5k
R1
R2
CO
+
VO
D1
CIN
VIN
+
1
2
4
3
s Standard Connection
D1
: This device is necessary to protect the element from damage when reverse voltage may be applied to the regulator
in case of input short-circuiting.
Cref
: This device is necessary when it is required to enhance the ripple rejection or to delay the output start-up
time. Otherwise, it is not necessary.
(Care must be taken since Cref may raise the gain,facilitating oscillation.)
❇ The output start-up time si proportional to Cref✕R2.
CIN,CO : Be sure to mount the devices CIN and CO as close to the device terminal as possible so as to prevent oscillation.
The standard specification of CIN and CO is 0.33µF and 47µF, respectively. However, adjust them as necessary after
checking.
R1,R2
: These devices are necessary to set the output voltage. The output voltage VO is given by the following formula:
VO=Vref✕(1+R2/R1)
(Vref is 1.25V TYP)
The standard value of R1 is 2k
Ω. But value up to 390Ω to 5kΩ does not cause any trouble.
s Setting of Output Voltage
Output voltage is able to set (1.5V to 7V) when resistors R1,R2 are attached to ➁, ➂, ➃ terminals. As for the external
resistors to set output voltage, refer to the figure below.
s ON/OFF Operation
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
+
Vref
2
4
3
R2
R1
VO
VO=Vref
×(1+R2/R1)
(R1=2k
Ω,Vref Nearly=1.25V)


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