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參數(shù)資料
| 型號(hào)： | MC78PC25 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Low Noise 150 mA Low Drop Out (LDO) Linear Voltage Regulator(低噪聲150mA低壓差（LDO）線性穩(wěn)壓器) |
| 中文描述： | 低噪聲一五○毫安低壓差（LDO）線性穩(wěn)壓器（低噪聲150mA的低壓差器（LDO）線性穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大小： | 143K |
| 代理商： | MC78PC25 |
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MC78PC00 Series
http://onsemi.com
12
APPLICATION HINTS
When using these circuits, please be sure to observe the
following points:
Phase compensation is made for securing stable operation
even if the load current varies. For this reason, be sure to
use a capacitor C
OUT
with good frequency characteristics
and ESR (Equivalent Series Resistance) as described in
the graphs on page 11.
On page 11, the relations between I
OUT
(Output Current)
and ESR of Output Capacitor are shown. The conditions
where the white noise level is under 40 V (Avg.) are
marked by the shaded area in the graph. (note: When
additional ceramic capacitors are connected to the Output
Pin with Output capacitor for phase compensation, there
is a possibility that the operation will be unstable. Because
of this, test these circuits with as same external
components as ones to be used on the PCB).
1
V
IN
5
V
OUT
3
2
GND
CE
CERAMIC
CAPACITOR
1.0 F
Figure 46. Measuring Circuit for White Noise: MC78PC30
CERAMIC
CAPACITOR
S.A.
SPECTRUM
ANALYSER
ESR
I
OUT
4.0 V
MEASURING CONDITIONS: (1) FREQUENCY RANGE: 10 Hz TO 1.0 MHz
MEASURING CONDITIONS:
(2) TEMPERATURE: 25
°
C
Please be sure the V
in
and GND lines are sufficiently
wide. When the impedance of these lines is high, there is
a chance to pick up noise or to malfunction.
Connect the capacitor with a capacitance of 1.0 F or
more between V
in
and GND as close as possible to V
in
or
GND.
Set external components, especially the Output Capacitor,
as close as possible to the circuit, and make the wiring as
short as possible.
V
IN
V
OUT
GND
CAP.
MC78PCxx
CE
CAP.
IN
Figure 47. Typical Application
OUT
+
+
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