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參數(shù)資料
| 型號： | LM8261M5 |
| 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)： | 17/19頁 |
| 文件大小： | 915K |
| 代理商： | LM8261M5 |
Application Notes:
(Continued)
TFT applications:
Figure 8 below, shows a typical application where the
LM8261 is used as a buffer amplifier for the V
com
signal em-
ployed in a TFT LCD flat panel:
Figure 9 shows the time domain response of the amplifier
when used as a V
buffer/driver with V
at ground. In
this application, the OpAmp loop will try and maintain its out-
put voltage based on the voltage on its non-inverting input
(V
REF
) despite the current injected into the TFT simulated
load.As long as this load current is within the range tolerable
by the LM8261 (45mA sourcing and 65mA sinking for +/5V
supplies), the output will settle to its final value within less
than 2μs.
Output Short Circuit Current and Dissipation Issues:
The LM8261 output stage is designed for maximum output
current capability. Even though momentary output shorts to
ground and either supply can be tolerated at all operating
voltages, longer lasting short conditions can cause the junc-
tion temperature to rise beyond the absolute maximum rat-
ing of the device, especially at higher supply voltage condi-
tions. Below supply voltage of 6V, output short circuit
condition can be tolerated indefinitely.
With the Op Amp tied to a load, the device power dissipation
consists of the quiescent power due to the supply current
flow into the device, in addition to power dissipation due to
the load current. The load portion of the power itself could in-
clude an average value (due to a DC load current) and anAC
component. DC load current would flow if there is an output
voltage offset, or the output AC average current is non-zero,
or if the Op Amp operates in a single supply application
where the output is maintained somewhere in the range of
linear operation. Therefore:
P
total
= P
Q
+ P
DC
+ P
AC
P
Q
= I
S
· V
S
Op Amp Quiescent
Power Dissipation
DC Load Power
AC Load Power
P
DC
= I
O
· (V
r
- V
o
)
P
AC
= See Table 1 below
where:
I
s
: Supply Current
V
s
: Total Supply Voltage (V
+
- V
)
I
o
: Average load current
V
o
: Average Output Voltage
V
r
: V
+
for sourcing and V
for sinking current
Table 1 below shows the maximum AC component of the
load power dissipated by the Op Amp for standard Sinusoi-
dal, Triangular, and Square Waveforms:
TABLE 1. Normalized AC Power Dissipated in the
Output Stage for Standard Waveforms
P
AC
(W.
/V
2
)
Triangular
46.9 x 10
3
Sinusoidal
50.7 x 10
3
The table entries are normalized to V
s2
/ R
. To figure out the
AC load current component of power dissipation, simply mul-
tiply the table entry corresponding to the output waveform by
the factor V
s2
/ R
. For example, with
±
15V supplies, a 600
load, and triangular waveform power dissipation in the out-
put stage is calculated as:
P
AC
= (46.9 x 10
3
) · [30
2
/600]= 70.4mW
Square
62.5 x 10
3
DS101084-59
FIGURE 7. Output Sinking Characteristics with Load
Lines
DS101084-61
FIGURE 8. V
com
driver application schematic
DS101084-65
FIGURE 9. V
com
driver performance scope photo
L
www.national.com
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM8261M5 | 制造商:Texas Instruments 功能描述:OP AMP HIGH O/P RRI/O SMD 8261 |
| LM8261M5/NOPB | 功能描述:運算放大器 - 運放 RRIO,Hi Out Crnt & UnLtd Cap Load OpAmp 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 |
| LM8261M5/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LM8261M5NOPB | 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 |
| LM8261M5X | 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 |
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