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參數(shù)資料
| 型號： | FAN4272M |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 電壓反饋運(yùn)算放大器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 196K |
| 代理商： | FAN4272M |
Preliminary
+
10k
General Description
The FAN4272 is single supply, general purpose, volt-
age-feedback amplifier. The FAN4272 is fabricated on
a
complimentary bipolar process, features a rail-to-rail
input and output, and is unity gain stable.
The typical non-inverting circuit schematic is shown in
Figure 1.
+V
s
Figure 1: Typical Non-inverting Configuration
Input Common Mode Voltage
The common mode input range extends to 250mV
below ground and to 250mV above Vs, in single supply
operation. Exceeding these values will not cause
phase reversal. However, if the input voltage exceeds
the rails by more than 0.5V, the input ESD devices will
begin to conduct. The output will stay at the rail during
this overdrive condition. If the absolute maximum
input voltage (700mV beyond either rail) is exceeded,
externally limit the input current to ±5mA as shown in
Figure 2.
Figure 2: Circuit for Input Current Protection
Power Dissipation
The maximum internal power dissipation allowed is
directly related to the maximum junction temperature.
If the maximum junction temperature exceeds 150
°
C,
some performance degradation will occur. It the
maximum junction temperature exceeds 175
°
C for an
extended time, device failure may occur.
Overdrive Recovery
Overdrive of an amplifier occurs when the output
and/or input ranges are exceeded. The recovery time
varies based on whether the input or output is over-
driven and by how much the ranges are exceeded.
The FAN4272 will typically recover in less than 50ns
from an overdrive condition. Figure 3 shows the
FAN4272 in an overdriven condition.
Figure 3: Overdrive Recovery
Driving Capacitive Loads
The
Frequency Response vs. C
L
plot, illustrates the
response of the FAN4272. A small series resistance (R
s
)
will improve stability and settling performance. R
s
values in the
Frequency Response vs. C
L
plot were
chosen to achieve maximum bandwidth with less than
2dB of peaking. For maximum flatness, use a larger
R
s
. As the plot indicates, the FAN4272 can easily drive
a 50pF capacitive load without a series resistance.
Figure 4: Typical Topology for driving
a capacitive load
Driving a capacitive load introduces phase-lag into
the output signal, which reduces phase margin in the
amplifier. The unity gain follower is the most sensitive
configuration. In a unity gain follower configuration,
the FAN4272 requires a 510
series resistor to drive a
100pF load.
I
Time (10
μ
s/div)
Output
Input
G = 5
-
V
o
KM4270
V
in
+
-
R
f
R
g
R
s
C
L
R
L
DATA SHEET
FAN4272
6
Preliminary September 2001
+
KM4270
-
R
f
0.01
μ
F
6.8
μ
F
+
Out
In
R
g
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PDF描述 |
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| FAN4272MA | Voltage-Feedback Operational Amplifier |
| FAN4272MAX | Voltage-Feedback Operational Amplifier |
| FAN4272MX | Voltage-Feedback Operational Amplifier |
| FAN5201MSA | Battery Management |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN4272MA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| FAN4272MAX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| FAN4272MX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| FAN4274 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Single and Dual, Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier |
| FAN4274_12 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Single and Dual, Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier |
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