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參數(shù)資料
| 型號(hào)： | OPA512 |
| 英文描述： | Very High Current， High Power Operational Amplifier |
| 中文描述： | 非常大電流，高功率運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 6/6頁(yè) |
| 文件大小： | 60K |
| 代理商： | OPA512 |
OPA512
6
under normal load conditions. Sensing both the output cur-
rent and the output voltage, this limiter circuit increases the
current limit value as the output voltage approaches the
power supply voltage (where power dissipation is low.) This
type of limiting is achieved by connecting pin 7 through a
programming resistor to ground. The V-I limiter circuit is
governed by the equation:
where:
I
LIMIT
is the maximum current available at a given output
voltage.
R
VI
is the value (k
) of the resistor from pin 7 to ground.
R
CL
is the current limit resistor in ohms.
V
O
is the instantaneous output voltage in volts.
Reactive or EMF-generating loads may produce unusual
(perhaps undesirable) waveforms with the V-I limit circuit
driven into limit. Since current peaks in a reactive load do
not align with the output voltage peaks, the output waveform
will not appear as a simple voltage-limited waveform.
Response of the load to the limiter, in fact, may produce a
“backfire” reaction producing unusual output waveforms.
APPLICATIONS INFORMATION
POWER SUPPLIES
Specifications for the OPA512 are based on a nominal
operating voltage of
±
40V. A single power supply or unbal-
anced supplies may be used as long as the maximum total
operating voltage (total of +V
S
and –V
S
) is not greater than
90V (100V for OPA512SM model.)
CURRENT LIMITS
Current limit resistors must be provided for proper opera-
tion. Independent positive and negative current limit values
may be selected by choice of R
CL+
and R
CL–
, respectively.
Resistor values are calculated by:
R
CL
= 0.65/I
LIM
(amps) –0.007
This is the nominal current limit value at room temperature.
The maximum output current decreases at high temperature
as shown in the typical performance curve. Most wire-
wound resistors are satisfactory, but some highly inductive
types may cause loop stability problems. Be sure to evaluate
performance with the actual resistors to be used in produc-
tion.
HEAT SINKING
Power amplifiers are rated by case temperature (not ambient
temperature.) The maximum allowable power dissipation is
a function of the case temperature as shown in the power
derating curve. Load characteristics, signal conditions, and
power supply voltage determine the power dissipated by the
amplifier. The case temperature will be determined by the
heat sinking conditions. Sufficient heat sinking must be
provided to keep the case temperature within safe bounds
given the power dissipated and ambient temperature. See
Application Bulletin AB-038 for further details.
SAFE OPERATING AREA (SOA)
The safe area plot provides a comprehensive summary of the
power handling limitations of a power amplifier, including
maximum current, voltage and power as well as the second-
ary breakdown region (see Figure 1) It shows the allowable
output current as a function of the power supply to output
voltage differential (voltage across the conducting power
device.) See Application Bulletin AB-039 for details on
SOA.
VOLTAGE-CURRENT LIMITER CIRCUITRY
The voltage-current (V-I) limiter circuit provides a means to
protect the amplifier from SOA damage such as a short
circuit to ground, yet allows high output currents to flow
FIGURE 1. Safe Operating Area.
5
6
7 8 9 10
Voltage Across Output Transistor (V)
15
20
40
60
80
15
10
5
4
3
2
1
0.8
0.5
0.4
0.3
0.2
O
8
6
100
t = 5ms
Thermal Limit
t = 1ms
t = 0.5ms
T
C
= +25°C
T
C
= +85°C
T
C
= +125°C
Secondary Breakdown
1.5
I
LIMIT
=
20 + R
VI
0.65 +
R
CL
+ 0.007
0.28 V
O
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA512BM | Voltage-Feedback Operational Amplifier |
| OPA512SM | 2K, 256 X 8 SERIAL EE, 2.5V, -40C to +85C, 8-DFN, T/R |
| OPA541AM | High Power Monolithic OPERATIONAL AMPLIFIER |
| OPA541AP | RxxPxx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 05V; Power: 1W; EN 60950 certified, rated for 250VAC; UL-60950-1 / CSA C22.2 certified; 5.2kVDC Isolation for 1 Minute; Optional Continuous Short Circuit Protected; 2 Chamber Transformer System; UL94V-0 Package Material; Efficiency to 80% |
| OPA541BM | RxxPxx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 05V; Power: 1W; EN 60950 certified, rated for 250VAC; UL-60950-1 / CSA C22.2 certified; 5.2kVDC Isolation for 1 Minute; Optional Continuous Short Circuit Protected; 2 Chamber Transformer System; UL94V-0 Package Material; Efficiency to 80% |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA512BM | 功能描述:運(yùn)算放大器 - 運(yùn)放 Very Hi Current Hi Pwr 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(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 |
| OPA512BM | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| OPA512SM | 功能描述:運(yùn)算放大器 - 運(yùn)放 Very Hi Current Hi Pwr 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(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 |
| OPA541 | 制造商:BB 制造商全稱:BB 功能描述:High Power Monolithic OPERATIONAL AMPLIFIER |
| OPA541AM | 功能描述:運(yùn)算放大器 - 運(yùn)放 Hi-Power Monolithic 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(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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