PA46 Datasheet, PDF (1/4 Pages) Cirrus Logic – HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA46
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX [phone]
FEATURES
• 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
• 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.
EQUIVALENT SCHEMATIC
6
+V_S
D1
Q3
D2
D3
D4
–IN
D5
1
Q11
Q12
2
+IN
Q20
Q21
Q24
Q8
Q13
CC1
8
9 CC2
Q2
3
SHDN
7
I_Q
Q5 Q6
Q9
Q7 OUTPUT
DRIVE
Q10 5
10
Q14
Q15
CURRENT
SENSE
Q16
Q17
Q19
–V_S
D7
4
TYPICAL APPLICATION
+80
R_C
6
C_C
V_I
2
8
9 ^RCL
R_{I 1} ^PA46
5
10
4
–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.
EXTERNAL CONNECTIONS
R_CL
R_C
Package: SIP02
OUTPUT
C_C
1 2 3 4 5 6 7 8 9 10
–IN +IN SHDN –V_S OUT +V_S I_Q C_C1 C_C2 I_LIM
C_C is NPO rated for full suppy voltage.
Phase Compensation
Gain
≥10
C_C
10pF
R_C
1KΩ
≥1
68pF 1KΩ
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