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參數(shù)資料
| 型號： | LP2951ACM.TR |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 640K |
| 代理商： | LP2951ACM.TR |
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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| LP2951ACMX | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2951ACMX NOPB | 制造商:National Semiconductor 功能描述:LDO Regulator Pos 1.24V to 29V 0.1A 8-Pin SOIC T/R |
| LP2951ACMX/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO Adj Micropower Vltg Reg RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2951ACMX-3.0 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2951ACMX-3.0/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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