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| 型号： | PA89 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 元件分类： | 运算放大器 |
| 英文描述： | HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS |
| 中文描述： | 高压功率运算放大器 |
| 文件页数： | 4/4页 |
| 文件大小： | 69K |
| 代理商： | PA89 |
APEX MICROTECHNOLOGY CORPORATION
5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
PA89U REV. F FEBRUARY 1998
1998 Apex Microtechnology Corp.
OPERATING
CONSIDERATIONS
PA89 PA89A
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.
STABILITY
Although the PA89 can be operated at unity gain, maximum
slew rate and bandwidth performance was designed to be
obtained at gains of 10 or more. Use the small signal response
and phase response graphs as a guide. In applications where
gains of less than 10 are required, use noise gain compensa-
tion to increase the phase margin of the application circuit as
illustrated in the typical application drawing.
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier has two distinct limitations:
1.
The current handling capability of the MOSFET geometry
and the wire bonds.
2.
The junction temperature of the output MOSFETs.
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
SAFE OPERATING CURVES
The safe operating area curves define the maximum addi-
tional internal power dissipation the amplifier can tolerate when
it produces the necessary output to drive an external load. This
is not the same as the absolute maximum internal power
dissipation listed elsewhere in the specification since the quies-
cent power dissipation is significant compared to the total.
EXTERNAL COMPONENTS
The very high operating voltages of the PA89 demand
consideration of two component specifications rarely of con-
cern in building op amp circuits: voltage rating and voltage
coefficient.
100
The compensation capacitance C
must be rated for the full
supply voltage range. For example, with supply voltages of
±
500V the possible voltage swing across C
is 1000V. In
addition, a voltage coefficient less than 100PPM is recom-
mended to maintain the capacitance variation to less than 5%
for this example. It is strongly recommended to use the highest
quality capacitor possible rated at least twice the total supply
voltage range.
Of equal importance are the voltage rating and voltage
coefficient of the gain setting resistances. Typical voltage
ratings of low wattage resistors are 150 to 250V. In the above
example 1000V could appear across the feedback resistor.
This would require several resistors in series to obtain the
proper voltage rating. Low voltage coefficient resistors will
insure good gain linearity. The wattage rating of the feedback
resistor is also of concern. A 1 megohm feedback resistor
could easily develop 1 watt of power dissipation.
Though high voltage rated resistors can be obtained,
a 1 megohm feedback resistor comprised of five 200Kohm, 1/
4 watt metal film resistors in series will produce the proper
voltage rating, voltage coefficient and wattage rating.
CURRENT LIMIT
For proper operation the current limit resistor (R
) must be
connected as shown in the external connection diagram. The
minimum value is 3.5 ohm, however for optimum reliability the
resistor value should be set as high as possible. The value is
calculated as follows with the maximum practical value of 150
ohms.
R
CL
=
When setting the value for R
allow for the load current as
well as the current in the feedback resistor. Also allow for the
temperature coefficient of the current limit which is approxi-
mately -0.3% /
°
C of case temperature rise.
CAUTIONS
The operating voltages of the PA89 are potentially lethal.
During circuit design, develop a functioning circuit at the lowest
possible voltages. Clip test leads should be used for “hands
off” measurements while troubleshooting.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient absorbers are recom-
mended as protection on the supply pins. The zeners clamp
transients to voltages within the power supply rating and also
clamp power supply reversals to ground. Whether the zeners
are used or not, the system power supply should be evaluated
for transient performance including power-on overshoot and
power-off polarity reversals as well as line regulation.
Conditions which can cause open circuits or polarity rever-
sals on either power supply rail should be avoided or protected
against. Reversals or opens on the negative supply rail is
known to induce input stage failure. Unidirectional transzorbs
prevent this, and it is desirable that they be both electrically and
physically as close to the amplifier as possible.
.7
I
LIM
100
300
500
80010001200
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, V – V (V)
3
10
30
O
S
S
200
5
15
50
100mS
25°C
85°C
125°C
T = T
CASE
10mS
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