RP107x

NO.EA-181-131018

7

TYPICAL APPLICATION

RP107x

Series

CE

GND

∗

TECHNICAL NOTES

When using the RP107x Series, please note the following points.

The RP107x Series are using an output capacitor as phase compensation to ensure a stable operation even if

the output load fluctuates. To reduce the output voltage fluctuation, it is imperative that a 0.1µF to 10µF output

capacitor be used. When doing so, please note the following three points.

1.

increase beyond 40µV, therefore, it is imperative that the stability of operation including the frequency

characteristics be evaluated.

2.

occurred in the other circuits may give some impacts on the noise level, therefore it is imperative that the

enough measures be taken such as to make GND lowered.

As for 1 and 2, please refer to the chart of the External Capacitor vs. Output Voltage.

0

0.0001

0.001

0.01

0.1

1

10

0

0.001

0.01

0.1

1

10

100

1000

I

ノイズレベル＞40

μV

外来ノイズの影響を受け易い

ノイズレベル≦40

μV

※１

※2

Noise Level

≤ 40µV

Noise Level > 40µV

This area could be easily affected by exogenous noise.

*1

*2

External Capacitor vs. Output Voltage

3.

In case of using a tantalum capacitor, the output may oscillate if the effective series resistance (ESR)

is high, therefore, it is imperative that the ESR vs. Frequency be considered.

PCB Layout

＊RP107N (SOT-23-5) is the non-promotion product. As of June in 2016.