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參數(shù)資料
| 型號： | PA45 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER |
| 中文描述： | 高壓功率運算放大器 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 58K |
| 代理商： | PA45 |
APEX MICROTECHNOLOGY CORPORATION
5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
PA45U REV. B FEBRUARY 1998
1998 Apex Microtechnology Corp.
OPERATING
CONSIDERATIONS
PA45
GENERAL
Please read the General Operating Considerations section,
which covers stability, supplies, heat-sinking, mounting, cur-
rent limit, SOA interpretation, and specification interpretation.
Additional information can be found in the application notes.
For information on the package outline, heatsink, and mount-
ing hardware, consult the “Accessories Information” and “Pack-
aging” mechanical data section of the data book.
CURRENT LIMIT
Current limiting is achieved by developing 0.83V on the
amplifiers current sense circuit by way of an internal tie to the
output drive (pin 8) and an external current sense line (pin 1).
A sense resistor R
is used to relate this sense voltage to a
current flowing from output drive.
0.83 – 0.05 * I
CL
I
CL
0.83
R
CL
+ 0.05
R
CL
=
I
CL
=
with a maximum practical value of 16
. R
is added to the
typical value of output resistance and affects the total possible
swing since it carries the load current. The swing reduction, V
R
can be established V
R
= I
OUT
*
R
CL
.
INPUT PROTECTION
The PA45 inputs are protected against common mode
voltages up to the supply rails, differential voltages up to
±
16
volts and static discharge. Differential voltages exceeding 16
volts will be clipped by the protection circuitry. However, if
more than a few milliamps of current is available from the input
drive source, the protection circuitry could be destroyed. The
protection circuitry includes 300 ohm current limiting resistors
at each input. This security may be insufficient for severe
overdrive of the input. Adding external resistors to the applica-
tion which limits severe input overdrive current to 1mA, will
prevent damage.
STABILITY
The PA45 has sufficient phase margin when compensated
for unity gain to be stable with capacitive loads of at least 10nF.
However, the low pass circuit created by the sum-point (–in)
capacitance and the feedback network may add phase shift
and cause instabilities. As a rule, the sum-point load resis-
tance (input and feedback resistors in parallel) should be 1k
ohm or less. Alternatively, use a bypass capacitor across the
feedback resistor. The time constant of the feedback resistor
and bypass capacitor combination should match the time
constant of the sum-point resistance and sum-point capaci-
tance.
The PA45 is externally compensated and performance can
be tailored to the application. The compensation network C
-
R
must be mounted closely to the amplifier pins 7 and 2 to
avoid noise coupling to these high impedance nodes.
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier has limitations from its channel temperature.
NOTE: The output is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
-V
O
(V)
4
6
8 10
20
40
60
100
200
O
S
S
,
0.1
0.2
0.4
0.6
0.8
1.0
2.0
DC T
C
=85
°
C
4.0
6.0
PULSE CURVES @ 10% DUTY CYCLE MAX
DC T
C
=125
°
C
200mS
DC
SAFE OPERATING AREA
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