HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA46
M I C R O T E C H N O L O G Y
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
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MONOLITHIC MOS TECHNOLOGY
PROGRAMMABLE I
Q
(5 or 50 mA MAX)
LOW COST
HIGH VOLTAGE OPERATION—150V
HIGH SLEW RATE—27V/µs
HIGH POWER—5A, 75W DISSIPATION
APPLICATIONS
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MAGNETIC DEFLECTION
PA AUDIO
MOTOR DRIVE
NOISE CANCELLATION
DESCRIPTION
The PA46 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. Class C
operation with resulting low quiescent current is pin program-
mable. A shutdown input turns off the output stage.
This circuit utilizes a beryllia oxide (BeO) substrate to
minimize thermal resistance. The 10-pin power SIP package
is electrically isolated.
TYPICAL APPLICATION
+80
R
C
6
2
8
9
C
C
R
CL
C
F
YOKE
–20
R
D
R
F
V
I
R
I
1
PA46
10
4
5
±2.5A
7µSec Retrace
Horizontal Deflection Coil Amplifiers
R
S
EQUIVALENT SCHEMATIC
6
+V
S
D1
Q24
3
SHDN
Q2
Q5
Q6
Q7
Q3
Q8
D2
D4
–IN
1
2
+IN
Q20
–V
S
4
Q21
D7
D5
Q11
Q12
CC1
8
9 CC2
D3
Q13
Q14
Q15
Q16
Q17
Q19
7
I
Q
Q9
Q10
OUTPUT
DRIVE
5
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.
EXTERNAL CONNECTIONS
R
CL
R
C
1
–IN
2
3
4
5
6
7
I
Q
8
C
C1
Package: SIP02
OUTPUT
10
CURRENT
SENSE
C
C
9
C
C2
10
I
LIM
+IN SHDN –V
S
OUT +V
S
C
C
is NPO rated for full suppy voltage.
Phase Compensation
R
C
Gain
C
C
≥10
10pF
1KΩ
≥
1
68pF
1KΩ
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
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