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| 型號(hào)： | 5926-3870501MGA |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 725K |
| 代理商： | 5926-3870501MGA |
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
**
Drive with TTL-high to shut down. Ground or leave open if shutdown
feature is not to be used.
Note:
Pins 2 and 6 are left open.
FIGURE 2. Adjustable Regulator
L
www.national.com
11
This Material Copyrighted by Its Respective Manufacturer
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| 5926-3870501MXA | Analog IC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 5926-3870501MPA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Series of Adjustable Micropower Voltage Regulators |
| 5926-3870501MXA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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| 5926-3SF | 制造商:Carlisle Interconnect Components 功能描述:RF COAXIAL PANEL MOUNT CONNECTOR |
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