NJM7800SDL1 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJM7800SDL1 Datasheet PDF : 10 Pages
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NJM7800S
■ TEST CIRCUIT
1. Output Voltage, Line Regulation, Load Regulation,
Quiescent Current, Average, Output Noise Voltage,
Temperature Coefficient of Output Voltage,
Peak Output/Short Circuit Current
IIN
A
1
3
NJM7800S
A
VIN
0.33µF
2
0.1µF
IO
BPF
V VO
VNO
V.V
2. Ripple Rejection
ein=1VP-P
f=120Hz
1
3
NJM7800S
VIN
0.33µF
2
0.1µF
ℓ 30cm
ℓ
eO
CRT
IO
▪ Measurement is to be conducted in pulse testing
▪ IQ=IIN - IO
RR = 20 logଵ ቀቁ
・Input Capacitor CIN
Input Capacitor CIN is required to prevent oscillation and reduce power supply ripple for applications when high power
supply impedance or a long power supply line.
Therefore, use the recommended CIN value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and
should connect between GND and VIN as shortest path as possible to avoid the problem.
・Output Capacitor CO
Output capacitor (CO) will be required for a phase compensation of the internal error amplifier.
The capacitance and the equivalent series resistance (ESR) influence to stable operation of the regulator.
Use of a smaller CO may cause excess output noise or oscillation of the regulator due to lack of the phase
compensation.
On the other hand, Use of a larger CO reduces output noise and ripple output, and also improves output transient
response when rapid load change.
Therefore, use the recommended CO value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and
should connect between GND and VOUT as shortest path as possible for stable operation.
In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a temperature
characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor supplier enough.
When selecting CO, recommend that have withstand voltage margin against output voltage and superior temperature
characteristic though this product is designed stability works with wide range ESR of capacitor including low ESR
products.
-4-
Ver.2016-01-08
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