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參數(shù)資料
| 型號(hào)： | PA84A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | POWER OPERATIONAL AMPLIFIERS |
| 中文描述： | 功耗運(yùn)算放大器 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大小： | 77K |
| 代理商： | PA84A |
OPERATING
CONSIDERATIONS
PA84
PA84A
PA84S
GENERAL
Please read the
“
General Operating Considerations
”
sec-
tion, which covers stability, supplies, heatsinking, mounting,
current limit, SOA interpretation, and specification interpreta-
tion. Additional information can be found in the application
notes. For information on the package outline, heatsinks, and
mounting hardware, consult the
“
Accessory and Package
Mechanical Data
”
section of the handbook.
SAFE OPERATING AREA (SOA)
The bipolar output stage of this high voltage operational
amplifier has two output limitations:
1. The internal current limit which limits maximum available
output current.
2. The second breakdown effect, which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
The SOA curves combine the effect of these limits. For a
given application, the direction and magnitude of the output
current should be calculated or measured and checked against
the SOA curves. This is simple for resistive loads but more
complex for reactive and EMF generating loads. However, the
following guidelines may save extensive analytical efforts:
1. The following capacitive and inductive loads are safe:
±
V
S
C(MAX)
150V
1.2
μ
F
125V
6.0
μ
F
100V
12
μ
F
75V
ALL
2. Short circuits to ground are safe with dual supplies up to
±
150V or single supplies up to 150V.
3. Short circuits to the supply rails are safe with total supply
voltages up to 150V (i.e.
±
75V).
L(MAX)
.7H
25H
90H
ALL
OUTPUT PROTECTION
Two external diodes as shown in Figure 2, are required to
protect these amplifiers against flyback (kickback) pulses
exceeding the supply voltages of the amplifier when driving
inductive loads. For component selection, these external
diodes must be very quick, such as ultra fast recovery diodes
with no more than 200 nanoseconds of reverse recovery time.
STABILITY
Due to its large bandwidth the PA84 is more likely to oscillate
than lower bandwidth Power Operational Amplifiers such as
the PA83 or PA08. To prevent oscillations, a reasonable phase
margin must be maintained by:
1. Selection of the proper phase compensation capacitor and
resistor. Use the values given in the table under external
connections and interpolate if necessary. The phase mar-
gin can be increased by using a large capacitor and a
smaller resistor than the slew rate optimized values listed in
the table. The compensation capacitor may be connected to
common (in lieu of +V
) if the positive supply is properly
bypassed to common. Because the voltage at pin 8 is only
a few volts below the positive supply, this ground connec-
tion requires the use of a high voltage capacitor.
2. Keeping the external sumpoint stray capacitance to ground
at a minimum and the sumpoint load resistance (input and
feedback resistors in parallel) below 500
. Larger sumpoint
load resistance can be used with increased phase compen-
sation (see 1 above).
3. Connecting the amplifier case to a local AC common thus
preventing it from acting as an antenna.
+V
S
–
V
S
FIGURE 1. PROTECTIVE,
INDUCTIVE LOAD
20
30
40
50
25
35
300
200
250
150
170
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V)
O
S
–
V
S
t=5ms
t=1ms
SAFE OPERATING AREA CURVES
STEADYSTATE
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA84U REV. L JANUARY 2000
2000 Apex Microtechnology Corp.
Be sure the diode voltage rating is greater than the total of both
supplies. The diode will turn on to divert the flyback energy into
the supply rails thus protecting the output transistors from
destruction due to reverse bias.
A note of caution about the supply. The energy of the flyback
pulse must be absorbed by the power supply. As a result, a
transient will be superimposed on the supply voltage, the
magnitude of the transient being a function of its transient
impedance and current sinking capability. If the supply voltage
plus transient exceeds the maximum supply rating or if the AC
impedance of the supply is unknown, it is best to clamp the
output and the supply with a zener diode to absorb the
transient.
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