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參數(shù)資料
| 型號(hào)： | LP2951ACS |
| 英文描述： | Fixed & Adjustable Voltage Regulator |
| 中文描述： | 固定 |
| 文件頁(yè)數(shù)： | 11/21頁(yè) |
| 文件大?。?/td> | 640K |
| 代理商： | LP2951ACS |
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Application Hints
(Continued)
REDUCING OUTPUT NOISE
In reference applications it may be advantageous to reduce
the AC noise present at the output. One method is to reduce
the regulator bandwidth by increasing the size of the output
capacitor. This is the only way noise can be reduced on the
3 lead LP2950 but is relatively inefficient, as increasing the
capacitor from 1 μF to 220 μF only decreases the noise from
430 μV to 160 μV rms for a 100 kHz bandwidth at 5V output.
Noise can be reduced fourfold by a bypass capacitor across
R
, since it reduces the high frequency gain from 4 to unity.
Pick
or about 0.01 μF. When doing this, the output capacitor must
be increased to 3.3 μF to maintain stability. These changes
reduce the output noise from 430 μV to 100 μV rms for a
100 kHz bandwidth at 5V output. With the bypass capacitor
added, noise no longer scales with output voltage so that im-
provements are more dramatic at higher output voltages.
DS008546-7
*
See Application Hints
feDrive with TTL-high to shut down. Ground or leave open if shutdown
Note:
Pins 2 and 6 are left open.
FIGURE 2. Adjustable Regulator
www.national.com
11
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| LP2951ACZ5 | Analog IC |
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相關(guān)代理商/技術(shù)參數(shù) |
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| LP2951ACS-3 | 制造商:ADMOS 制造商全稱:ADMOS 功能描述:100mA LOW DROPOUT VOLTAGE REGULATOR |
| LP2951ACS-3.3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:100 mA Low Dropout Voltage Regulators |
| LP2951ACS-33 | 制造商:ADMOS 制造商全稱:ADMOS 功能描述:100mA LOW DROPOUT VOLTAGE REGULATOR |
| LP2951ACS-3-3 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:100mA Low Dropout Voltage Regulators |
| LP2951ACS-3-3/TR | 制造商:EXAR 制造商全稱:EXAR 功能描述:100mA, LOW DROPOUT VOLTAGE REGULATORS |
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