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參數資料
| 型號： | PA19A |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 電壓反饋運算放大器 |
| 文件頁數： | 1/4頁 |
| 文件大小： | 55K |
| 代理商： | PA19A |
APEX MICROTECHNOLOGY CORPORATION
TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
FEATURES
VERY FAST SLEW RATE — 900 V/
μ
s
POWER MOS TECHNOLOGY — 4A peak rating
LOW INTERNAL LOSSES — 2V at 2A
PROTECTED OUTPUT STAGE — Thermal Shutoff
WIDE SUPPLY RANGE —
±
15V TO
±
40V
APPLICATIONS
VIDEO DISTRIBUTION AND AMPLIFICATION
HIGH SPEED DEFLECTION CIRCUITS
POWER TRANSDUCERS UP TO 5 MHz
MODULATION OF RF POWER STAGES
POWER LED OR LASER DIODE EXCITATION
DESCRIPTION
The PA19 is a high voltage, high current operational ampli-
fier optimized to drive a variety of loads from DC through the
video frequency range. Excellent input accuracy is achieved
with a dual monolithic FET input transistor which is cascoded
by two high voltage transistors to provide outstanding com-
mon mode characteristics. All internal current and voltage
levels are referenced to a zener diode biased on by a current
source. As a result, the PA19 exhibits superior DC and AC
stability over a wide supply and temperature range.
High speed and freedom from second breakdown is as-
sured by a complementary power MOS output stage. For
optimum linearity, especially at low levels, the power MOS
transistors are biased in a class A/B mode. Thermal shutoff
provides full protection against overheating and limits the
heatsink requirements to dissipate the internal power losses
under normal operating conditions. A built-in current limit of
0.5A can be increased with the addition of two external
resistors. Transient inductive load kickback protection is pro-
vided by two internal clamping diodes. External phase com-
pensation allows the user maximum flexibility in obtaining the
optimum slew rate and gain bandwidth product at all gain
settings. A heatsink of proper rating is recommended.
This hybrid circuit utilizes thick film (cermet) resistors,
ceramic capacitors, and silicon semiconductor chips to maxi-
mize reliability, minimize size, and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections at all operating temperatures. The 8-pin TO-3
package is hermetically sealed and electrically isolated. The
use of compressible thermal washers and/or improper mount-
ing torque will void the product warranty. Please see “General
Operating Considerations”.
TOP
VIEW
1
2
3
4
5
6
7
8
–V
+IN
–IN
OUT
C
C
R
CL–
PHASE COMPENSATION
GAIN
C
C
330pF
22pF
2.2pF
none
1
10
100
1000
+V
R
CL+
TYPICAL APPLICATION
This fast power driver utilizes the 900V/
μ
s slew rate of the
PA19 and provides a unique interface with a current output
DAC. By using the DAC’s internal 1K
feedback resistor,
temperature drift errors are minimized, since the temperature
drift coefficients of the internal current source and the internal
feedback resistor of the DAC are closely matched. Gain of
V
to I
is –6.5/mA. The DAC’s internal 1K resistor together
with the external 500
and 110
form a “tee network” in the
feedback path around the PA19. This effective resistance
equals 6.5K
. Therefore the entire circuit can be modeled as
6.5K
feedback resistor from output to inverting input and a
5mA current source into the inverting input of the PA19. Now
we see the familiar current to voltage conversion for a DAC
where V
OUT
= –I
IN
x R
FEEDBACK
.
EQUIVALENT SCHEMATIC
EXTERNAL CONNECTIONS
3
6
8
5
4
1
Q3
Q5
Q4
D1
D2
Q16
Q13
Q12
Q1
Q7
Q19
Q17B
Q11
Q10
2
7
Q15
Q20
Q24
Q25
Q21
Q22
Q9
Q8
Q2
Q17A
Q23
+40V
–40V
±32.5V
R
CL+
PA19
PA19 AS FAST POWER DRIVER
R
CL–
5.6pF
Up to 4A
110
500
±5mA
1K
DAC
TYPICAL
APPLICATION
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
M I C R O T E C H N O L O G Y
VIDEO POWER OPERATIONAL AMPLIFIERS
PA19 PA19A
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