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參數(shù)資料
| 型號： | OPA445 |
| 英文描述： | High Voltage FET-Input OPERATIONAL AMPLIFIER |
| 中文描述： | 高電壓FET輸入運算放大器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 131K |
| 代理商： | OPA445 |
10
OPA445
R
1
R
2
OPA445
OPA445
“SLAVE”
“MASTER”
V
IN
R
S(1)
10
R
S(1)
10
R
L
NOTE: (1) R
resistors minimize the circulating
current that will always flow between the two devices
due to V
OS
errors.
INCREASING OUTPUT CURRENT
In those applications where the 15mA of output current is
not sufficient to drive the required load, output current can
be increased by connecting two or more OPA445s in parallel
as shown in Figure 7. 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 8 is capable of
supplying output currents up to 1A.
INPUT PROTECTION
The inputs of conventional FET-input op amps should be
protected against destructive currents that can flow when
input FET gate-to-substrate isolation diodes are forward-
biased. This can occur if the input voltage exceeds the power
supplies or there is an input voltage with V
S
= 0V. Protection
is easily accomplished with a resistor in series with the
input. Care should be taken because the resistance in series
with the input capacitance may affect stability. Many input
signals are inherently current-limited, therefore, a limiting
resistor may not be required.
FIGURE 7. Parallel Amplifiers Increase Output Current
Capability.
R
1
R
2
OPA445
TIP30C
TIP29C
V
IN
+45V
–45V
V
O
R
3(1)
100
NOTE: (1) Provides current limit for OPA445 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
FIGURE 8. External Output Transistors Boost Output Current up to 1 Amp.
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| OPA445AP | High Voltage FET-Input OPERATIONAL AMPLIFIER |
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| OPA445BM | High Voltage FET-Input OPERATIONAL AMPLIFIER |
| OPA4658UB | Quad Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA445ADDA | 功能描述:運算放大器 - 運放 Hi Vltg FET-Input 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 |
| OPA445ADDAG4 | 功能描述:運算放大器 - 運放 Hi Vltg FET-Input 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 |
| OPA445ADDAR | 功能描述:運算放大器 - 運放 Hi Vltg FET-Input 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 |
| OPA445ADDARG4 | 功能描述:運算放大器 - 運放 Hi Vltg FET-Input 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 |
| OPA445AP | 功能描述:運算放大器 - 運放 Hi Voltage FET-Input 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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