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參數(shù)資料
| 型號： | OPA549T |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 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% |
| 中文描述： | 高電壓，大電流運(yùn)算放大器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 140K |
| 代理商： | OPA549T |
8
OPA549
APPLICATIONS INFORMATION
Figure 1 shows the OPA549 connected as a basic non-
inverting amplifier. The OPA549 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.
Be sure to connect
both
output pins (pins 1 and 2).
CONTROL REFERENCE (Ref) PIN
The OPA549 features a reference (ref) pin to which the I
LIM
and the Enable/Status (E/S) pin are referred. Ref simply
provides a reference point accessible to the user that can be
set to V–, ground, or any reference of the user’s choice.
Ref cannot be set below the negative supply or above (V+) – 8V.
If the minimum V
S
is used, Ref must be set at V–.
ADJUSTABLE CURRENT LIMIT
The OPA549’s accurate, user-defined current limit can be
set from 0A to 10A 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 OPA549 senses the load
indirectly. This allows the current limit to be set with a 0
μ
A
to 633
μ
A control signal. In contrast, other designs require a
limiting resistor to handle the full output current (up to 10A
in this case).
Although the design of the OPA549 allows output currents
up to 10A, it is not recommended that the device be operated
continuously at that level. The highest rated continuous
current capability is 8A. Continuously running the OPA549
at output currents greater than 8A will degrade long-term
reliability.
Operation of the OPA549 with current limit less than 1A
results in reduced current limit accuracy. Applications re-
quiring lower output current may be better suited to the
OPA547 or OPA548.
Resistor-Controlled Current Limit
Figure 2a shows a simplified schematic of the internal
circuitry used to set the current limit. Leaving the I
LIM
pin
open programs the output current to zero, while connecting
I
LIM
directly to Ref programs the maximum output current
limit, typically 10A.
With the OPA549, the simplest method for adjusting the
current limit uses a resistor or potentiometer connected
between the I
LIM
pin and Ref according to Equation 1:
75kV
I
LIM
Commonly used values are shown in Figure 2.
Digitally-Controlled Current Limit
The low-level control signal (0
μ
A to 633
μ
A) also allows the
current limit to be digitally controlled by setting either a
current (I
SET
) or voltage (V
SET
). The output current I
LIM
can be
adjusted by varying I
SET
according to Equation 2:
I
SET
= I
LIM
/15800
Figure 2b demonstrates a circuit configuration implement-
ing this feature.
The output current I
LIM
can be adjusted by varying V
SET
according to Equation 3:
V
SET
= (Ref) + 4.75V – (7500
)(I
LIM
)/15800
(3)
Figure 11 demonstrates a circuit configuration implement-
ing this feature.
FIGURE 1. Basic Circuit Connections.
POWER SUPPLIES
The OPA549 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 that vary significantly with oper-
ating 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 OPA549 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.
Be sure to connect
both V– pins (pins 5 and 7) to the negative power supply
and both V+ pins (pins 10 and 11) to the positive power
supply. Package tab is internally connected to V–, how-
ever, do use the tab to conduct current.
G = 1+ R
2
R
1
Z
L
E/S
8
9
10, 11
3
4
5, 7
6
1, 2
R
2
I
LIM(1)
Ref
R
1
0.1
μ
F
(2)
10
μ
F
OPA549
V–
V+
+
+
V
IN
10
μ
F
0.1
μ
F
(2)
V
O
NOTE: (1) I
connected to Ref gives the maximum
current limit, 10A (peak). (2) Connect capacitors directly to
package power supply pins.
(2)
(1)
R
– 7.5k
CL
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA551UA | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
| OPA552 | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
| OPA552FA | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
| OPA552PA | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
| OPA552UA | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA549T | 制造商:BURR-BROWN 功能描述:IC OP-AMP HIGH VOLTAGE 8A |
| OPA549T | 制造商:Texas Instruments 功能描述:IC OP-AMP 900KHZ 9V/ TO-220-11 制造商:Texas Instruments 功能描述:IC, OP-AMP, 900KHZ, 9V/ us, TO-220-11 |
| OPA549TG3 | 功能描述:運(yùn)算放大器 - 運(yùn)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(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 |
| OPA551 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Voltage (100V), High-Current (50mA) OPERATIONAL AMPLIFIERS, G = 1 Stable |
| OPA551/OPA552 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:OPA551. OPA552 - High-Voltage. High-Current OPERATIONAL AMPLIFIERS |
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