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參數(shù)資料
| 型號： | OPA547 |
| 英文描述： | High-Voltage. High-Current Op Amp. Excellent Output Swing |
| 中文描述： | 高電壓。大電流運算放大器。優(yōu)秀的輸出擺幅 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 82K |
| 代理商： | OPA547 |
7
OPA541
FIGURE 1. Safe Operating Area.
Short circuit protection requires evaluation of SOA. When
the amplifier output is shorted to ground, the full power
supply voltage is impressed across the conducting output
transistor. The current limit must be set to a value which is
safe for the power supply voltage used. For instance, with V
S
±
35V, a short to ground would force 35V across the conduc-
ting power transistor. A current limit of 1.8A would be safe.
Reactive, or EMF-generating, loads such as DC motors can
present difficult SOA requirements. With a purely reactive
load, output voltage and load current are 90
°
out of phase.
Thus, peak output current occurs when the output voltage is
zero and the voltage across the conducting transistor is equal
to the full power supply voltage. See Burr-Brown Applica-
tion Bulletin AB-039 for further information on evaluating
SOA.
REPLACING HYBRID POWER AMPLIFIERS
The OPA541 can be used in applications currently using
various hybrid power amplifiers, including the OPA501,
OPA511, OPA512, and 3573. Of course, the application
must be evaluated to assure that the output capability and
other performance attributes of the OPA541 meet the neces-
sary requirement. These hybrid power amplifiers use two
current limit resistors to independently set the positive and
negative current limit value. Since the OPA541 uses only
one current limit resistor to set both the positive and negative
current limit, only one resistor (see Figure 4) need be
installed. If installed, the resistor connected to pin 2 (TO-3
package) is superfluous, but it does no harm.
Because one resistor carries the current previously carried
by two, the resistor may require a higher power rating.
Minor adjustments may be required in the resistor value to
achieve the same current limit value. Often, however, the
change in current limit value when changing models is small
compared to its variation over temperature. Many applica-
tions can use the same current limit resistor.
FIGURE 3. Isolating Capacitive Loads.
APPLICATIONS CIRCUITS
10
1
0.1
1
10
100
|V – V | (V)
SAFE OPERATING AREA
|
O
T = +25°C
T = +85°C
AP, AM
BM, SM
T
= +125°C
“M” Package only
FIGURE 2. Clamping Output for EMF-Generating Loads.
10μF
OPA541
0.1μF
0.1μF
10μF
–V
S
D
2
D
1
L
Inductive or
EMF-Generating
Load
+V
S
D – D : IN4003
OPA541
0.1
100k
R
2
10k
R
1
V
IN
20pF
L
OPA541
0.1
Slave
A = –R /R
= –10
1
Master
10k
20pF
FIGURE 4. Replacing OPA501 with OPA541.
OPA541
1
2
8
R
CL
Not Required
OPA501
1
2
8
R
CL
R
CL
+
–
Pin 2 is “open” on OPA541.
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