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參數(shù)資料
| 型號： | PA44 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER |
| 中文描述： | 高壓功率運(yùn)算放大器 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 66K |
| 代理商： | PA44 |
OPERATING
CONSIDERATIONS
PA44
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, supplies, heat sinking, mount-
ing, current limit, SOA interpretation, and specification inter-
pretation. Visit www.apexmicrotech.com for design tools that
help automate tasks such as calculations for stability, internal
power dissipation, current limit; heat sink selection; Apex
’
s
complete Application Notes library; Technical Seminar Work-
book; and Evaluation Kits.
CURRENT LIMIT
For proper operation the current limit resistor, R
, must be
connected as shown in the external connection diagram. The
minimum value is 33 ohms, however for optimum reliability the
resistor value should be set as high as possible. The value can
be estimated as follows with the maximum practical value of
500 ohms.
3
R
CL
=
I
LIM
Use the typical performance graphs as a guide for expected
variations in current limit value with a given R
and variations
over temperature. The selected value of R
must be added to
the specified typical value of output resistance to calculate the
total output resistance. Since the load current passes through
R
the value selected also affects the output voltage swing
according to:
V
R
= I
O
*
CL
where V
R
is the voltage swing reduction.
When the amplifier is current limiting, there may be small
signal spurious oscillation present during the current limited
portion of the negative half cycle. The frequency of the oscil-
lation is not predictable and depends on the compensation,
gain of the amplifier, and load. The oscillation will cease as the
amplifier comes out of current limit.
INPUT PROTECTION
The PA44 inputs are protected against common mode
voltages up the supply rails and differential voltages up to
±
16
volts as well as static discharge. Differential voltages exceed-
ing 16 volts will be clipped by the protection circuitry. However,
if more than a few milliamps of current is available from the
overload source, the protection circuitry could be destroyed.
The protection circuitry includes 300 ohm current limiting
resistors at each input, but this may be insufficient for severe
overloads. It may be necessary to add external resistors to the
application circuit where severe overload conditions are ex-
pected. Limiting input current to 1mA will prevent damage.
STABILITY
The PA44 has sufficient phase margin when compensated
for unity gain to be stable with capacitive loads of at least 10 nF.
However, the low pass circuit created by the sumpoint (
–
in)
capacitance and the feedback network may add phase shift
and cause instabilities. As a general rule, the sumpoint load
resistance (input and feedback resistors in parallel) should be
1K ohm or less at low gain settings (up to 10). Alternatively, use
a bypass capacitor across the feedback resistor. The time
constant of the feedback resistor and bypass capacitor com-
bination should match the time constant of the sumpoint
resistance and sumpoint capacitance.
The PA44 is externally compensated and performance can
be tailored to the application. Use the graphs of small signal
gain and phase response as well as the graphs for slew rate
and power response as a guide. The compensation capacitor
C
must be rated at 350V working voltage. The compensation
capacitor and associated resistor R
must be mounted closely
to the amplifier pins to avoid spurious oscillation. An NPO
capacitor is recommended for compensation.
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 die metallization.
2. The temperature of the output MOSFETs.
NOTE: The output stage is protected against transient
flyback. However, for protection against sustained, high en-
ergy flyback, external fast-recovery diodes should be used.
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
-V
O
(V)
10
20
30
50
100
200
300
500
O
S
–
V
S
,
2
3
4
5
10
20
30
40
50
100
DC T
C
=125
°
C
DC T
C
=85
°
C
DC
300mS
PULSE CURVES @ 10% DUTY CYCLE MAX
PA44 SOA
200mS
120
200
HEATSINKING
The PA44 package has a large exposed integrated copper
heatslug to which the monolithic amplifier is directly attached.
The solder connection of the heatslug to a minimum 1 square
inch foil area of the printed circuit board will result in thermal
performance of 25
°
C/W junction to air rating of the PA44.
Solder connection to an area of 1 to 2 square inches of foil is
recommended. This may be adequate heatsinking but the
large number of variables involved suggest temperature mea-
surements be made on the top of the package. Do not allow the
temperature to exceed 85
°
C. The heatslug is tied internally to
–
Vs.
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.
PA44U REV. C APRIL 2000
2000 Apex Microtechnology Corp.
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