PQ30RV21 데이터 시트보기 (PDF) - Sharp Electronics

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PQ30RV21

Low Power-Loss Voltage Regulators

Sharp Electronics 

Low Power-Loss Voltage Regulators

Fig.21 Output Peak Current vs. Junction

Temperature (PQ30RV2/PQ30RV21)

5

4

VIN–VO=5V

2V

3

0.5V

IOP:Output current when output voltage

is 95% in comparison with the initial value

2 R1=390Ω,R2=2.7kΩ

–20 0 25 50 75 100 125

Junction temperature Tj (˚C)

PQ30RV1/PQ30RV11/PQ30RV2/PQ30RV21

s Standard Connection

D1

VIN

1

2

VO

+

R2

4

Cref

+

CIN

3

R1

390Ω

to 10kΩ

CO

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(❇1).

(❇1)Otherwise, it is not necessary.

(Care must be taken since Cref may raise the gain, facilitating oscillation.)

(❇1)The output start-up time is 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, ajust 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 390Ω. But value up 10kΩ does not cause any trouble.

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