鈥?/div>
MAGNETIC DEFLECTION
PA AUDIO
MOTOR DRIVE
NOISE CANCELLATION
TYPICAL APPLICATION
+80
R
C
3
4
2
7
8
C
C
R
CL
C
F
YOKE
鈥?0
R
D
R
F
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.
V
I
R
I
PA45
5
6
1
鹵2.5A 7碌Sec Retrace
Horizontal Deflection Coil Amplifiers
R
S
EQUIVALENT SCHEMATIC
3
+V
S
D1
Q24
Q5
Q3
Q8
D2
D4
鈥揑N
5
4
+IN
Q20
鈥揤
S
6
Q21
D7
D5
Q11
Q12
CC1
2
7 CC2
D3
Q13
Q14
Q15
Q16
Q17
Q19
1
CURRENT
SENSE
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
碌Sec
retrace time, half of which is
required for amplifier slewing. This circuit can perform 15.75
KHz deflection in up to 50碌H coils at up to 5A p-p.
EXTERNAL CONNECTIONS
Q2
+V
S
CC1
OUTPUT
2
CURRENT
SENSE
1
Q6
Q7
Q9
Q10
OUTPUT
DRIVE
8
+IN 4
3
C
C
R
C
TOP VIEW
5
鈥揑N
鈥揤
S
6
7
CC2
8
OUTPUT
DRIVE
R
CL
C
C
IS NPO RATED
FOR FULL SUPPLY VOLTAGE.
PHASE
COMPENSATION
Gain
鈮?0
鈮?
C
C
10pF
68pF
R
C
1K鈩?/div>
1K鈩?/div>
APEX MICROTECHNOLOGY CORPORATION
鈥?TELEPHONE (520) 690-8600 鈥?FAX (520) 888-3329 鈥?ORDERS (520) 690-8601 鈥?EMAIL prodlit@apexmicrotech.com
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