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參數(shù)資料
| 型號： | OPA547F |
| 元件分類： | DC/DC變換器 |
| 英文描述： | RxxP2xx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 15V; Power: 2W; EN 60950 certified, rated for 250VAC; UL-60950-1 / CSA C22.2 certified; 5.2kVDC Isolation for 1 Minute; Optional Continuous Short Circuit Protected; Wide Operating Temperature Range atfull 2 Watts Load, ?40??C to +85??C; Twin Chamber Transformer System; UL94V-0 Package Material; Efficiency to 80% |
| 中文描述： | 高電壓，大電流運算放大器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 175K |
| 代理商： | OPA547F |
8
OPA547
APPLICATIONS INFORMATION
Figure 1 shows the OPA547 connected as a basic non-
inverting amplifier. The OPA547 can be used in virtually
any op amp configuration.
Power supply terminals should be bypassed with low series
impedance capacitors. The technique shown, using a ce-
ramic and tantalum type in parallel is recommended. Power
supply wiring should have low series impedance.
G = 1+ R
2
R
1
Z
L
E/S
3
7
5
2
1
6
R
2
I
LIM(1)
R
1
0.1μF
(2)
10μF
OPA547
V–
V+
+
+
V
IN
10μF
0.1μF
(2)
V
O
NOTE: (1) I
connected to V– gives the maximum current
limit, 750mA (peak). (2) Connect 0.1μF capacitors directly
to package power supply pins.
With the OPA547, the simplest method for adjusting the
current limit uses a resistor or potentiometer connected
between the I
LIM
pin and V– according to the equation:
R
CL
=
(5000)(4.75)
I
LIM
The low level control signal (0 to 150
μ
A) also allows the
current limit to be digitally controlled with a current-out or
voltage-out DAC reference to V– according to the equations
given in Figure 3.
Figure 3 shows a simplified schematic of the internal cir-
LIM
pin open
programs the output current to zero, while connecting I
LIM
directly to V– programs the maximum output current limit,
typically 750mA.
SAFE OPERATING AREA
Stress on the output transistors is determined both by the
output current and by the output voltage across the conduct-
ing output transistor, V
S
– V
O
. The power dissipated by the
output transistor is equal to the product of the output current
and the voltage across the conducting transistor, V
S
– V
O
.
The Safe Operating Area (SOA curve, Figure 2) shows the
permissible range of voltage and current.
– 31.6k
FIGURE 1. Basic Circuit Connections.
POWER SUPPLIES
The OPA547 operates from single (+8V to +60V) or dual
(
±
4V to
±
30V) supplies with excellent performance. Most
behavior remains unchanged throughout the full operating
voltage range. Parameters which vary significantly with
operating voltage are shown in the typical performance
curves.
Some applications do not require equal positive and negative
output voltage swing. Power supply voltages do not need to
be equal. The OPA547 can operate with as little as 8V
between the supplies and with up to 60V between the
supplies. For example, the positive supply could be set to
55V with the negative supply at –5V, or vice-versa.
ADJUSTABLE CURRENT LIMIT
The OPA547 features an accurate, user-selected current
limit. Current limit is set from 0 to 750mA by controlling the
input to the I
LIM
pin. Unlike other designs which use a power
resistor in series with the output current path, the OPA547
senses the load indirectly. This allows the current limit to be
set with a 0 to 150
μ
A control signal. In contrast, other
designs require a limiting resistor to handle the full output
current (750mA in this case).
1
2
5
10
V
S
– V
O
(V)
20
50
100
SAFE OPERATING AREA
1k
100
O
10
Current-Limited
T
C
= 25°C
T
C
= 125°C
T
C
= 85°C
Output current may
be limited to less
than 500mA—see text.
Pulse Operation Only (<50% Duty-Cycle)
FIGURE 2. Safe Operating Area.
The safe output current decreases as V
S
– V
O
increases. Out-
put short-circuits are a very demanding case for SOA. A
short-circuit to ground forces the full power supply voltage
(V+ or V–) across the conducting transistor. With T
C
= 25
°
C
the maximum output current of 500mA can be achieved
under most conditions. Increasing the case temperature re-
duces the safe output current that can be tolerated without
activating the thermal shutdown circuit of the OPA547. For
further insight on SOA, consult Application Bulletin
AB-039.
POWER DISSIPATION
Power dissipation depends on power supply, signal and load
conditions. For dc signals, power dissipation is equal to the
product of output current times the voltage across the con-
相關PDF資料 |
PDF描述 |
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| OPA547T | RxxP2xx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 15V; Power: 2W; EN 60950 certified, rated for 250VAC; UL-60950-1 / CSA C22.2 certified; 5.2kVDC Isolation for 1 Minute; Optional Continuous Short Circuit Protected; Wide Operating Temperature Range atfull 2 Watts Load, ?40??C to +85??C; Twin Chamber Transformer System; UL94V-0 Package Material; Efficiency to 80% |
| OPA548F | RxxP2xx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 3.3V; Power: 2W; EN 60950 certified, rated for 250VAC; UL-60950-1 / CSA C22.2 certified; 5.2kVDC Isolation for 1 Minute; Optional Continuous Short Circuit Protected; Wide Operating Temperature Range atfull 2 Watts Load, ?40??C to +85??C; Twin Chamber Transformer System; UL94V-0 Package Material; Efficiency to 80% |
| OPA548T | RxxP2xx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 3.3V; Power: 2W; EN 60950 certified, rated for 250VAC; UL-60950-1 / CSA C22.2 certified; 5.2kVDC Isolation for 1 Minute; Optional Continuous Short Circuit Protected; Wide Operating Temperature Range atfull 2 Watts Load, ?40??C to +85??C; Twin Chamber Transformer System; UL94V-0 Package Material; Efficiency to 80% |
| OPA549T | RxxPxx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 15V; 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% |
| OPA551UA | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OPA547F/250 | 制造商:Texas Instruments 功能描述: |
| OPA547F/500 | 功能描述:運算放大器 - 運放 Hi-Vltg Hi-Current Exc Output Swing 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA547F/500G3 | 功能描述:運算放大器 - 運放 Hi-Vltg Hi-Current Exc Output Swing 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA547F500 | 制造商:BB 制造商全稱:BB 功能描述:High-Voltage, High-Current OPERATIONAL AMPLIFIER |
| OPA547FKTWT | 功能描述:運算放大器 - 運放 Hi-Vltg Hi-Current Exc Output Swing 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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