- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383692 > OPA569 Power Op Amp. Output Signal Swings Within 200mV of Rails at 2A Output Current PDF資料下載
參數(shù)資料
| 型號： | OPA569 |
| 英文描述： | Power Op Amp. Output Signal Swings Within 200mV of Rails at 2A Output Current |
| 中文描述： | 功率運算放大器。輸出信號擺幅在200mV的Rails的輸出電流為2A |
| 文件頁數(shù)： | 14/23頁 |
| 文件大?。?/td> | 411K |
| 代理商： | OPA569 |
OPA569
SBOS264
14
www.ti.com
The accuracy of the current copy is reduced with small output
currents. An internal circuit monitors the direction of the
output current and enables the positive or the negative
current monitoring circuitry accordingly. There is an approxi-
mate 20
μ
s delay in the change of current direction. The
switching point is near quiescent conditions and may cause
current monitor inaccuracy with small output currents.
ENABLE PIN
—
OUTPUT DISABLE
The Enable pin can disable the OPA569 within microsec-
onds. When disabled, the amplifier draws less than 10
μ
A and
its output enters a high-impedance state that allows multi-
plexing. It is important to note that when the amplifier is
disabled, the Thermal Flag pin circuitry continues to operate.
This feature allows use of the Thermal Flag pin output to
implement thermal protection strategies. For more details,
please see the section on thermal protection.
The OPA569 Enable pin has an internal pull-up circuit, so it
does not have to be connected to the positive supply for
normal operation. To disable the amplifier, the Enable pin
must be connected to no more than (V
–
) + 0.8V. To enable
the amplifier, either allow the Enable pin to float or connect
it to at least (V
–
) + 2.5V.
The Enable pin is referenced to the negative supply (V
–
).
Therefore, shutdown operation is slightly different in single-
supply and dual-supply applications.
In single-supply operation, V
–
typically equals common
ground, thus the enable/disable logic signal and the OPA569
Enable pin are referenced to the same potential. In this
configuration, the logic level and the OPA569 Enable pin can
simply be tied together. Disable occurs for voltage levels of
less than 0.8V. The OPA569 is enabled at logic levels
greater than 2.5V.
In dual-supply operation, the logic level is referenced to a
logic ground. However, the OPA569 Enable pin is still refer-
enced to V
–
. To disable the OPA569, the voltage level of the
logic signal needs to be level-shifted. This can be done using
an optocoupler, as shown in Figure 5.
Examples of output behavior during disabled and enabled
conditions with various load impedances are shown in the
typical characteristics section. Please note that this behavior
is a function of board layout, load impedances and bypass
strategies. For sensitive loads, the use of a low-pass filter or
other protection strategy is recommended.
ENSURING MICROCONTROLLER COMPATIBILITY
Not all microcontrollers output the same logic state after
power-up or reset. 8051-type microcontrollers, for example,
output logic HIGH levels on their ports while other models
power up with logic LOW levels after reset.
In configuration (a) shown in Figure 5, the enable/disable
signal is applied on the cathode side of the photodiode within
the optocoupler. A logic HIGH level causes the OPA569 to
be enabled, and a logic LOW level disables the OPA569. In
configuration (b) of Figure 5, with the logic signal applied on
the anode side, a high level disables the OPA569 and a low
level enables the op amp.
RAIL TO RAIL OUTPUT RANGE
The OPA569 has a class AB output stage with common
source transistors that are used to achieve rail-to-rail output
swing. It was designed to be able to swing closer to the rail
than other existing linear amplifiers, even with high output
current levels. A quick way to estimate the output swing with
various output current requirements is by using the equation:
V
SWING
[typical] = 0.1
I
O
Plots of the Output Swing vs Output Current, Supply Voltage,
and Temperature are provided in the typical characteristics
section.
Optocoupler
4N38
NOTE: (1) Optional
—
may be required
to limit leakage current of octocoupler
at high temperatures.
Enable
V+
V
O
5
6
8
14,
15
17,
18
12,
13
(a) +5V
(b) HCT or TTL In
HCT or
TTL In
(a)
(b)
OPA569
(1)
V
–
FIGURE 5. OPA569 Shutdown Configuration for Dual
Supplies.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA602 | High-Speed Precision Difet OPERATIONAL AMPLIFIER |
| OPA602AM | High-Speed Precision Difet OPERATIONAL AMPLIFIER |
| OPA602AP | High-Speed Precision Difet OPERATIONAL AMPLIFIER |
| OPA602AU | High-Speed Precision Difet OPERATIONAL AMPLIFIER |
| OPA602BM | High-Speed Precision Difet OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA569AIDWP | 功能描述:運算放大器 - 運放 2A Pwr Op Amp Rail-To-Rail I/O 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 |
| OPA569AIDWPG4 | 功能描述:運算放大器 - 運放 2A Pwr Op Amp Rail-To-Rail I/O 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 |
| OPA569AIDWPR | 功能描述:運算放大器 - 運放 2A Pwr Op Amp Rail-To-Rail I/O 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 |
| OPA569AIDWPRG4 | 功能描述:運算放大器 - 運放 2A Pwr Op Amp Rail-To-Rail I/O 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 |
| OPA5723YGO | 制造商:KODENSHI 制造商全稱:KODENSHI KOREA CORP. 功能描述:Yellow Green LED Chip |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。