PA45 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA45
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX [phone]
FEATURES
• MONOLITHIC MOS TECHNOLOGY
• LOW COST
• HIGH VOLTAGE OPERATION—150V
• HIGH SLEW RATE—27V/µs
• HIGH POWER—5A, 85W DISSIPATION
APPLICATIONS
• MAGNETIC DEFLECTION
• PA AUDIO
• MOTOR DRIVE
• NOISE CANCELLATION
DESCRIPTION
The PA45 is a high power monolithic MOSFET operational
amplifier that achieves performance levels unavailable even in
many hybrid amplifier designs. Inputs are protected from
excessive common mode and differential mode voltages as
well as static discharge. The safe operating area (SOA) has no
second breakdown limitations and can be observed with all
type loads by choosing an appropriate current limiting resistor.
External compensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.
This circuit utilizes a beryllia (BeO) substrate to minimize
thermal resistance. Ultrasonically bonded aluminum wires
provide reliable interconnections at all operating tempera-
tures. The 8-pin TO-3 package is hermetically sealed and
electrically isolated. The use of compressible isolation wash-
ers and/or improper mounting torque will void the product
warranty.
EQUIVALENT SCHEMATIC
PATENTED
TYPICAL APPLICATION
+80
R_C
C_C
3
V_I
4
2
7 _{8 RCL}
R_I
PA45
5
1
6
–20
C_F
R_D
R_F
YOKE
±2.5A 7µSec Retrace
R_S
Horizontal Deflection Coil Amplifiers
Horizontal deflection amplifiers require both high speed and
low distortion. The speed at which current can be changed in a
deflection coil is a function of the voltage available from the op
amp. In this application an 80 volt power supply is used for the
retrace polarity to provide a 7 µSec retrace time, half of which is
required for amplifier slewing. This circuit can perform 15.75
KHz deflection in up to 50µH coils at up to 5A p-p.
3
+V_S
D1
Q24
Q3
D2
D3
D4
–IN
D5
5
Q11
Q12
4
+IN
Q20
Q21
Q8
Q13
CC1
2
7 CC2
–V_S
D7
6
EXTERNAL CONNECTIONS
Q2
Q5 Q6
Q9
Q7 _OUTPUT
DRIVE
Q10 ₈
1
Q14
Q15
CURRENT
SENSE
Q16
Q17
Q19
+V_S
CC1
2
3
CURRENT
SENSE
1
OUTPUT
+IN 4
C_C
TOP VIEW
R _CL
R_C
5
–IN
8
6
–V_S
7
CC2
OUTPUT
DRIVE
C_C IS NPO RATED
FOR FULL SUPPLY VOLTAGE.
PHASE
COMPENSATION
Gain
C_C
R_C
≥10 10pF 1KΩ
≥1
68pF 1KΩ
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