Datasheet > RN5RG44AA-TL-FB

RN5RG44AA-TL-FB

更新时间： 2024-02-19 02:43:08

品牌	Logo	应用领域
理光 - RICOH		光电二极管
页数	文件大小	规格书
11页	561K
描述
Analog Circuit, 1 Func, CMOS, PDSO5, MINI, PLASTIC, SOT-23, 5 PIN

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RN5RG44AA-TL-FB 数据手册

RN5RG

OPERATION

In these ICs, the output voltage VOUT is detected by

feed-back registers RA, RB, and the detected the output

voltage is compared with a reference voltage by error

Amplifier, so that the base current of an external PNP

transistor is adjusted and the output voltage VOUT is reg-

ulated.

External PNP Transistor

EXT

VOUT

OUT

GND

Error

Amplifier

V^DD

–

Vref

GND

SELECTION GUIDE FOR EXTERNAL COMPONENTS

1.External PNP Transistor

Select an external PNP transistor from the view-

External PNP Transistor

OUT

VIN

points of output current, input voltage and power dis-

sipation.

EXT

VOUT

Generally external PNP transistor with low VCE

and high hFE is suitable.

(

SAT

)

2.Base Resistor R2

EXT Pin of these ICs is protected by a current limit circuit from the destruction caused by excess current.

However, since this current limit circuit is provided for the purpose of protecting the IC, use a resistor R2 for the

protection of the External Transistor, although this IC can be operated without such a resistor. It is required that

the resistance of the Resistor R2 be determined with the input voltage, output voltage,output current, tempera-

ture, and the hFE value taken into consideration and the dispersion of these values. Before making such a deter-

mination, check the characteristics by calculating the respective values by using the following formula :

VIN [Min.] –1.2(V)

0.7(V)

IOUT [Max.]

hFE

–

3.Phase Compensation

In these ICs, phase compensation is made for securing stable operation even when the load current is varied.

For this purpose, be sure to use a capacitor CL (tantalum type) with a capacitance of 10µF or more and a resistor

R1 with a resistance of about 10kΩ between the base and the emitter.There may be the case the loop oscillation

takes place when a tantalum capacitor CL with a large ESR is used, so select the CL carefully including the fre-

quency characteristics.

1 2 3 456 7 8...11

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