PQ7DV5 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
PQ7DV5
Sharp Electronics
'PQ7DV5' PDF : 5 Pages View PDF
Low Power-Loss Voltage Regulators
Fig.11 Ripple Rejection vs. Junction
Temperature
100
80
60
40
VIN=5V
20 VO=3V(R1=2kΩ,R2=2.8kΩ)
IO =0.5A,ei(rms)=0.5V
f=120Hz
0
–25 0 25 50 75
100 125
Junction temperature Tj (˚C)
PQ7DV5
s Standard Connection
D1
VIN
1
2
+
VO
R2
43
CIN
5
Cref
+
R1 2kΩ
CO
ON/OFF
signal
High or Open : Output ON
Low
: Output OFF
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 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= 0.33µ ,CO= 47µ, 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 2Ω. But value up to 10kΩ.
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