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HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA45
HTTP://WWW.APEXMICROTECH.COM
M I C R O T E C H N O L O G Y
(800) 546-APEX
(800) 546-2739
FEATURES
•
•
•
•
•
MONOLITHIC MOS TECHNOLOGY
LOW COST
HIGH VOLTAGE OPERATION—150V
HIGH SLEW RATE—27V/µs
HIGH POWER—5A, 85W DISSIPATION
PATENTED
APPLICATIONS
•
•
•
•
TYPICAL APPLICATION
MAGNETIC DEFLECTION
PA AUDIO
MOTOR DRIVE
NOISE CANCELLATION
+80
RC
3
DESCRIPTION
4
VI
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 temperatures. The 8-pin TO-3 package is hermetically sealed and
electrically isolated. The use of compressible isolation washers and/or improper mounting torque will void the product
warranty.
EQUIVALENT SCHEMATIC
CC
2
7
PA45
RI
5
1
CF
6
YOKE
RD
–20
RF
RS
±2.5A 7µSec Retrace
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
3
+VS
D1
Q2
+VS CC1
Q24
Q5
3
Q6
Q7
Q3
Q8
D2
D5
–IN
5
Q11
Q12
CC1
2
7 CC2
4
+IN
Q20
Q9
Q10
OUTPUT
DRIVE
8
CC
OUTPUT
CURRENT
SENSE
2
1
+IN 4
R CL
TOP VIEW
D3
D4
–VS
6
RCL
8
Q21
Q13
Q14
1
CURRENT
SENSE
Q15
Q16
5
8
–IN
–VS
6
OUTPUT
DRIVE
7
CC2
Q17
Q19
D7
RC
C C IS NPO RATED
FOR FULL SUPPLY VOLTAGE.
PHASE
COMPENSATION
Gain
CC
RC
≥10
≥1
10pF
68pF
1KΩ
1KΩ
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA45
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, continuous within SOA
POWER DISSIPATION, continuous @ TC = 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder – 10 sec
TEMPERATURE, junction
TEMPERATURE, storage
TEMPERATURE RANGE, powered (case)
ABSOLUTE MAXIMUM RATINGS
150V
5A
85W
±16 V
±VS
300°C
150°C
–65 to +150°C
–55 to +125°C
SPECIFICATIONS
TEST CONDITIONS1
PARAMETER
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs supply
OFFSET VOLTAGE, vs time
BIAS CURRENT, initial
BIAS CURRENT, vs supply
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE, voltage range
COMMON MODE REJECTION, DC
NOISE, broad band
10kHz BW, RS = 1KΩ
GAIN
OPEN LOOP at 15Hz
GAIN BANDWIDTH PRODUCT @ 1MHz
POWER BANDWIDTH
PHASE MARGIN
RL = 500Ω, CC = 10pF
CC = 10pF, 130V p-p, RL = 8Ω
Full temp range, CC = 68pF, RL = 10Ω
OUTPUT
VOLTAGE SWING
CURRENT, continuous
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD
RESISTANCE , no load
POWER SUPPLY
VOLTAGE3
CURRENT, quiescent
THERMAL2
RESISTANCE, AC junction to case
RESISTANCE, DC junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
NOTES: 1.
2.
3.
CAUTION
MIN
TYP
MAX
UNITS
5
10
8
10
50
15
2
100
2
200
106
10
mV
µV/°C
µV/V
µV √kh
pA
pA/V
pA
Ω
pF
V
dB
µV RMS
94
106
4.5
66
60
dB
MHz
kHz
°
±VS–10
5
±VS–8
V
A
µs
V/µs
nF
Ω
Full temperature range
20
±VS–10
90
IO = 5A
10V step, AV = –10
CC = 10pF, RL = 8Ω
AV = +1, CC = 68pF
RCL = 0
See Note 3
F > 60Hz
F < 60Hz
Full temperature range
Meets full range specifications
1011
5
2
27
10
150
±15
±50
30
±75
50
V
mA
1.3
1.5
°C/W
°C/W
°C/W
°C
30
–25
+85
Unless otherwise noted TC = 25°C, CC = 10pF, RC = 1KΩ. DC input specifications are ± value given. Power supply voltage is
typical rating.
Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF. For guidance, refer to heatsink data sheet.
Derate maximum supply voltage .5 V/°C below case temperature of 25°C. No derating is needed above TC = 25°C.
The PA45 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
PA45
0.7
–50 –25 0 25 50 75 100 125
CASE TEMPERATURE, TC (°C)
SMALL SIGNAL RESPONSE
POWER RESPONSE
200
PHASE, φ (°)
OPEN LOOP GAIN, A(dB)
CC = 10pF
–45
CC = 10pF
CC = 68pF
40
.1
1
–90
CC = 68pF
–135
RL = 1KΩ
RL = 500Ω
0
RL = 500Ω
10 100 1K 10K 100K 1M 10M
FREQUENCY, f (Hz)
–180
.1
HARMONIC DISTORTION
.100
.040
.020
85W
.010
.004
1W
.002
5W
.001
10 20 40 100 400 1K 2K 4K 10K 20K
FREQUENCY, f (Hz)
COMMON MODE REJECTION
100
80
60
40
20
10
100
1K 10K 100K
FREQUENCY, f (Hz)
1M
100
80
60
CC = 10pF
40
CC = 68pF
20
R L = 8Ω
10
8
6
4
10K 20K 40K 100K 200K 400K
FREQUENCY, f (Hz)
10 100 1K 10K 100K 1M 10M
FREQUENCY, f (Hz)
SLEW RATE
SLEW RATE, SR(V/µs)
.200
COMMON MODE REJECTION, CMR (dB)
DISTORTION, THD (%)
.400
1
1M
QUIESCENT CURRENT
2.0
50
AV = 10
CC = 10pf
RL = 8 Ω
40
1.5
No Load
30
°C
25
=
TC
1.0
20
8Ω Load
10
0
20
40
60
80
COMPENSATION CAPACITANCE, C C (pF)
POWER SUPPLY REJECTION, PSR (dB)
1.000
1.0
0.1
10
CURRENT LIMIT RESISTOR, R CL (Ω)
Ω
PHASE RESPONSE
0
120
80
-I LIM
–4
5°
C
25
50
75
100
125
CASE TEMPERATURE, TC (°C)
0.8
0
–5
0
0.9
=
0
1.0
+I LIM
C
20
4
T
40
1.1
CURRENT LIMIT, I (A)
60
ABSOLUTE CURRENT LIMIT
OUTPUT VOLTAGE, VO (VPP )
80
CURRENT LIMIT DRIFT
1.2
VOLTAGE DROP FROM SUPPLY, VS – VO (V) NORMALIZED QUIESCENT CURRENT, IQ(X)
POWER DERATING
100
NORMALIZED CURRENT LIMIT, ILIM (X)
INTERNAL POWER DISSIPATION, P(W)
TYPICAL PERFORMANCE
GRAPHS
POWER SUPPLY REJECTION
120
100
+VS
80
60
40
–VS
20
0
10
100
1K
10K 100K
FREQUENCY, f (Hz)
1M
TC =
5°C
+12
0.5
10 30 50 70 90 110 130 150
TOTAL SUPPLY VOLTAGE, VS (V)
OUTPUT VOLTAGE SWING
10
85°C –OUT
8
85°C +OUT
6
25°C +OUT
25°C – OUT
4
2
0
2
4
OUTPUT CURRENT, I O (A)
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
OPERATING
CONSIDERATIONS
PA45
GENERAL
SAFE OPERATING AREA (SOA)
Please read the General Operating Considerations section,
which covers stability, supplies, heat-sinking, mounting, current limit, SOA interpretation, and specification interpretation.
Additional information can be found in the application notes.
For information on the package outline, heatsink, and mounting hardware, consult the “Accessories Information” and “Packaging” mechanical data section of the data book.
The MOSFET output stage of this power operational amplifier has limitations from its channel temperature.
NOTE: The output is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
Current limiting is achieved by developing 0.83V on the
amplifiers current sense circuit by way of an internal tie to the
output drive (pin 8) and an external current sense line (pin 1).
A sense resistor RCL is used to relate this sense voltage to a
current flowing from output drive.
0.83 – 0.05 * ICL
RCL =
ICL
ICL =
0.83
RCL + 0.05
with a maximum practical value of 16Ω. RCL is added to the
typical value of output resistance and affects the total possible
swing since it carries the load current. The swing reduction, VR
can be established VR = IOUT * RCL.
OUTPUT CURRENT FROM +VS OR –VS, (A)
CURRENT LIMIT
SAFE OPERATING AREA
6.0
4.0
,T
C
DC
,T
1.0
0.8
C
DC
S
=
S
85
°C
12
5°
0.6
C
0.4
0.2
PULSE CURVES @ 10% DUTY CYCLE MAX
4
The PA45 inputs are protected against common mode
voltages up to the supply rails, differential voltages up to ±16
volts and static discharge. Differential voltages exceeding 16
volts will be clipped by the protection circuitry. However, if
more than a few milliamps of current is available from the input
drive source, the protection circuitry could be destroyed. The
protection circuitry includes 300 ohm current limiting resistors
at each input. This security may be insufficient for severe
overdrive of the input. Adding external resistors to the application which limits severe input overdrive current to 1mA, will
prevent damage.
=
m
0m
DC
2.0
0.1
INPUT PROTECTION
10
0
20
6 8 10
20
40 60
100
200
SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)
STABILITY
The PA45 has sufficient phase margin when compensated
for unity gain to be stable with capacitive loads of at least 10nF.
However, the low pass circuit created by the sum-point (–in)
capacitance and the feedback network may add phase shift
and cause instabilities. As a rule, the sum-point load resistance (input and feedback resistors in parallel) should be 1k
ohm or less. Alternatively, use a bypass capacitor across the
feedback resistor. The time constant of the feedback resistor
and bypass capacitor combination should match the time
constant of the sum-point resistance and sum-point capacitance.
The PA45 is externally compensated and performance can
be tailored to the application. The compensation network CCRC must be mounted closely to the amplifier pins 7 and 2 to
avoid noise coupling to these high impedance nodes.
This data
sheet has been carefully checked
and is believed
be reliable,
however,
no responsibility
assumed forARIZONA
possible inaccuracies
All specifications are
subject to change
without
notice.
APEX
MICROTECHNOLOGY
CORPORATION
• to
5980
NORTH
SHANNON
ROAD •is TUCSON,
85741 or
• omissions.
USA • APPLICATIONS
HOTLINE:
1 (800)
546-2739
PA45U REV. B FEBRUARY 1998
© 1998 Apex Microtechnology Corp.
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