參數(shù)資料
型號(hào)： OPA551
英文描述： High-Voltage. High-Current Operational Amplifiers
中文描述： 高電壓。大電流運(yùn)算放大器
文件頁(yè)數(shù)： 12/15頁(yè)
文件大小： 210K
代理商： OPA551
12
OPA551, OPA552
FIGURE 7. Driving Large Capacitive Loads.
CAPACITIVE LOADS
The dynamic characteristics of the OPA551 and OPA552
have been optimized for commonly encountered gains, loads,
and operating conditions. The combination of low closed-
loop gain and capacitive load will decrease the phase margin
and may lead to gain peaking or oscillations. Figure 7 shows
a circuit that preserves phase margin with capacitive load.
Figure 8 shows the small-signal step response for the circuit
in Figure 7. Consult Application Bulletin AB-028 for more
information.
FIGURE 8. Small-Signal Step Response for Figure 7.
SMALL-SIGNAL STEP RESPONSE
OPA551, G = –1, C
L
= 10nF
Time (2.5
μ
s/div)
2
FIGURE 9. Parallel Amplifers Increase Output Current Ca-
pability.
INCREASING OUTPUT CURRENT
In those applications where the 200mA of output current is
not sufficient to drive the desired load, output current can be
increased by connecting two or more OPA551s or OPA552s
in parallel as shown in Figure 9. Amplifier A1 is the
“master” amplifier and may be configured in virtually an op
amp circuit. Amplifier A2, the “slave”, is configured as a
unity gain buffer. Alternatively, external output transistors
can be used to boost output current. The circuit in Figure 10
is capable of supplying output currents up to 1A. Alterna-
tively, the OPA547, OPA548, and OPA549 series power op
amps should be considered for high output current drive,
along with programmable current limit and output disable
capability.
FIGURE 10. External Output Transistors Boost Output Cur-
rent Up to 1 Amp.
R
F
4k
C
1.8nF
10nF
OPA551
+30V
–30V
V
I
C
220pF
R
G
4k
R
1
R
2
OPA551
OPA551
“SLAVE”
“MASTER”
V
IN
R
S(1)
10
R
S(1)
10
R
L
NOTE: (1) R
resistors minimize the circulating
current that can flow between the two devices
due to V
OS
errors.
R
1
R
2
OPA551
TIP30C
TIP29C
V
IN
+30V
–30V
V
O
R
3(1)
100
NOTE: (1) R
provides current limit and allows the amplifier to
drive the load when the output is between 0.7V and –0.7V.
R
4
0.2
R
4
0.2
LOAD
C
F
OPA551
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA551/OPA552 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:OPA551. OPA552 - High-Voltage. High-Current OPERATIONAL AMPLIFIERS
OPA5516 制造商:KODENSHI 制造商全稱(chēng):KODENSHI KOREA CORP. 功能描述:Pure Green LED Chip
OPA551FA 制造商:Texas Instruments 功能描述:Operational Amplifier, Single AMP, Bipolar, 7 Pin, Plastic, SIP
OPA551FA/500 功能描述:運(yùn)算放大器 - 運(yùn)放 High-Volt High-Crnt Oper Amplifier 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
OPA551FA/500G3 功能描述:運(yùn)算放大器 - 運(yùn)放 High-Volt High-Crnt Oper Amplifier 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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