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參數(shù)資料
| 型號(hào)： | OP250 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers(單電源滿幅度輸入輸出雙運(yùn)放) |
| 中文描述： | CMOS單電源軌到軌輸入/輸出運(yùn)算放大器（單電源滿幅度輸入輸出雙運(yùn)放） |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 218K |
| 代理商： | OP250 |
OP250/OP450
REV. 0
–11–
+5V
R
X
20
V
OUT
V
IN
OP250
Figure 28. Output Short-Circuit Protection
Power Dissipation
Although the OPx50 family of amplifiers are able to provide
load currents of up to 250 mA, proper attention should be given
to not exceed the maximum junction temperature for the device.
T he equation for finding the junction temperature is given as:
T
J
JA
=
+
P
T
DISS
A
×θ
(3)
Where
T
J
= OPx50 junction temperature
P
DISS
= OPx50 power dissipation
θ
JA
= OPx50 junction-to-ambient thermal resistance of
the package; and
T
A
= T he ambient temperature of the circuit
In any application, the absolute maximum junction temperature
must be limited to +150
°
C. If this junction temperature is ex-
ceeded, the device could suffer premature failure. If the output
voltage and output current are in phase, for example, with a
purely resistive load, the power dissipated by the OPx50 can be
found as:
P
DISS
=
×
(
)
I
V
V
LOAD
SY
OUT
(4)
Where
I
LOAD
= OPx50 output load current
V
SY
= OPx50 supply voltage; and
V
OUT
= T he output voltage
By calculating the power dissipation of the device and using the
thermal resistance value for a given package type, the maximum
allowable ambient temperature for an application can be found
using Equation 3.
Overdrive Recovery
T he overdrive, or overload, recovery time of an amplifier is the
time required for the output voltage to return to a rated output
voltage from a saturated condition. T his recovery time can be
important in applications where the amplifier must recover
quickly after a large transient event. T he circuit in Figure 29
was used to evaluate the recovery time for the OPx50. Figures
30 and 31 show the overload recovery of the OP250 from the
positive and negative rails. It takes approximately 0.5 ms for the
amplifier to recover from output overload.
1
2
OP250
10k
V
9k
V
1k
V
1V
P–P
V
IN
V
OUT
Figure 29. Overload Recovery Time Test Circuit
1μs
500mV
Figure 30. Saturation Recovery from the Positive Rail
1μs
500mV
Figure 31. Saturation Recovery from the Negative Rail
Capacitive Loading
T he OPx50 family of amplifiers is well suited to driving capaci-
tive loads. T he device will remain stable at unity gain even un-
der heavy capacitive load conditions. However, a capacitive load
does not come without a penalty in bandwidth. Figure 32 shows
a graph of the OPx50 unity-gain bandwidth under various ca-
pacitive loads.
CAPACITIVE LOAD – nF
1.0
0.8
00
1k
1
B
10
100
0.6
0.4
0.2
V
S
= 2.5V
R
L
= 10k
T
A
= +25 C
Figure 32. Unity-Gain Bandwidth vs. Capacitive Load
As with any amplifier, an increase in capacitive load will also re-
sult in an increase in overshoot and ringing. T o improve the
output response, a series R-C network, known as a snubber, can
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| OP250GBC | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifier |
| OP250GP | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifier |
| OP250GRU | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers |
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