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LP2950 データシート(PDF) 10 Page - Micrel Semiconductor

部品番号 LP2950
部品情報  100mA Low-Dropout Voltage Regulator
PDF  17 Pages
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メーカー  MICREL [Micrel Semiconductor]
ホームページ  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

LP2950 データシート(HTML) 10 Page - Micrel Semiconductor

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Micrel, Inc.
LP2950/2951
September 2008
10
M9999-091208
Noise can be reduced fourfold by a bypass capacitor
across R1, since it reduces the high frequency gain from
4 to unity. Pick:
200Hz
R
2
1
C
1
BYPASS
•
≅
π
or about 0.01µF. When doing this, the output capacitor
must be increased to 3.3µF to maintain stability. These
changes reduce the output noise from 430µV to
100µVrms for a100kHz bandwidth at 5V output. With the
bypass capacitor added, noise no longer scales with
output voltage so that improvements are more dramatic
at higher output voltages.
Figure 1. ERROR Output Timing
Figure 2. Adjustable Regulator



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