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參數(shù)資料
| 型號： | LM8261M5X |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | RRIO, High Output Current & Unlimited Cap Load Op Amp in SOT23-5 |
| 中文描述： | OP-AMP, 9000 uV OFFSET-MAX, 24 MHz BAND WIDTH, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 915K |
| 代理商： | LM8261M5X |
Application Notes:
(Continued)
Op Amp’s compensation capacitor value and available cur-
rent into that capacitor. Beyond 10nF, the Slew Rate is deter-
mined by the Op Amp’s available output current. Note that
because of the lower output sourcing current compared to
the sinking one, the Slew Rate limit under heavy capacitive
loading is determined by the positive transitions.An estimate
of positive and negative slew rates for loads larger than
100nF can be made by dividing the short circuit current value
by the capacitor.
For the LM8261, the available output current increases with
the input overdrive. Referring to Figure 3 and Figure 4 Out-
put Short Circuit Current vs. Input Overdrive, it can be seen
that both sourcing and sinking short circuit current increase
as input overdrive increases. In a closed loop amplifier con-
figuration, during transient conditions while the fed back out-
put has not quite caught up with the input, there will be an
overdrive imposed on the input allowing more output current
than would normally be available under steady state condi-
tion. Because of this feature, the Op Amp’s output stage qui-
escent current can be kept to a minimum, thereby reducing
power consumption, while enabling the device to deliver
large output current when the need arises (such as during
transients).
Figure 5 shows the output voltage, output current, and the
resulting input overdrive with the device set for A
V
= +1 and
the input tied to a 1V
pp
step function driving a 47nF capaci-
tor. As can be seen, during the output transition, the input
overdrive reaches 1V peak and is more than enough to
cause the output current to increase to its maximum value
(see Figure 3 and Figure 4 plots). Note that because of the
larger output sinking current compared to the sourcing one,
the output negative transition is faster than the positive one.
Estimating the output voltage swing:
It is important to keep in mind that the steady state output
current will be less than the current available when there is
an input overdrive present. For steady state conditions, the
Output Voltage vs. Output Current plot (Typical Performance
Characteristics section) can be used to predict the output
swing. Figure 6 and Figure 7 show this performance along
with several load lines corresponding to loads tied between
the output and ground. In each cases, the intersection of the
device plot at the appropriate temperature with the load line
would be the typical output swing possible for that load. For
example, a 1K
load can accomadate an output swing to
within 250mV of V
and to 330mV of V
+
(Vs = +/15V) cor-
responding to a typical 29.3V
pp
unclipped swing.
DS101084-57
FIGURE 3. Output Short Circuit Sourcing Current vs
Input Overdrive
DS101084-56
FIGURE 4. Output Short Circuit Sinking Current vs
Input Overdrive
DS101084-39
FIGURE 5. Buffer Amplifier scope photo
DS101084-60
FIGURE 6. Output Sourcing Characteristics with Load
Lines
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM8261M5X/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LM8261M5XNOPB | 制造商:Texas Instruments 功能描述:OP Amp Single GP R-R I/O ±15V/30V 5-Pin SOT-23 T/R |
| LM8262 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:RRIO, High Output Current & Unlimited Cap Load Op Amp in MSOP |
| LM8262MM | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LM8262MM/NOPB | 功能描述:運算放大器 - 運放 DUAL RRIO UNLIM CAP LOAD OP AMP RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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