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参数资料
| 型号： | PA88A |
| 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： | 111K |
| 代理商： | PA88A |
OPERATING
CONSIDERATIONS
PA88 PA88A
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.
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.
.7
R
CL
=
I
LIM
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.
INPUT PROTECTION
Although the PA88 can withstand differential input voltages
up to
±
25V, additional external protection is recommended,
and required at total supply voltages above 300 volts. In most
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
–V
O
(V)
25
50
75
100
250
500
O
S
S
,
5
10
15
25
50
100
150
250
DC T
C
=125°C
DC T
C
=85°C
200mS
PULSE CURVES @ 10% DUTY CYCLE MAX
DC T
C
=25°C
100mS
125
applications 1N4148 or 1N914 signal diodes are sufficient (D1,
D2 in Figure 2a). In more demanding applications where low
leakage or low capacitance are of concern 2N4416 or 2N5457-
2N5459 JFETs connected as diodes will be required (Q1, Q2
in Figure 2b). In either case the input differential voltage will be
clamped to
±
.7V. This is sufficient overdrive to produce maxi-
mum power bandwidth.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors 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 reversal 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.
STABILITY
The PA88 has sufficient phase margin to be stable with most
capacitive loads at a gain of 4 or more, using the recommended
phase compensation.
The PA88 is externally compensated and performance can
be tailored to the application. Use the graphs of small signal
response and power response as a guide. The compensation
capacitor C
must be
rated at 500V working
voltage. An NPO capaci-
tor is recommended. The
compensation network
C
R
must be mounted
closely to the amplifier
pins 7 and 8 to avoid
spurious oscillation.
FIGURE 2. OVERVOLTAGE PROTECTION
PA88
+V
S
–IN
+IN
Z1
Z2
D2
D1
3
6
5
4
+V
S
–IN
+IN
Z1
Z2
3
6
5
4
PA88
Q1
Q2
a.
b.
–V
S
–V
S
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.
PA88U REV. I MARCH 1999
1999 Apex Microtechnology Corp.
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