FET INPUT POWER OPERATIONAL AMPLIFIERS
PA07 • PA07A
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
•
•
•
•
•
LOW BIAS CURRENT — FET Input
PROTECTED OUTPUT STAGE — Thermal Shutoff
EXCELLENT LINEARITY — Class A/B Output
WIDE SUPPLY RANGE —
±12V
TO
±50V
HIGH OUTPUT CURRENT —
±5A
Peak
APPLICATIONS
•
•
•
•
•
•
MOTOR, VALVE AND ACTUATOR CONTROL
MAGNETIC DEFLECTION CIRCUITS UP TO 4A
POWER TRANSDUCERS UP TO 100kHz
TEMPERATURE CONTROL UP TO 180W
PROGRAMMABLE POWER SUPPLIES UP TO 90V
AUDIO AMPLIFIERS UP TO 60W RMS
TYPICAL APPLICATION
C
L
R
L
R
F1
R
F2
+32V
C
F
R
CL+
.68
Ω
PA07
V = 28
EMF = 14V
R
W
= 14
Ω
MOTOR
DESCRIPTION
The PA07 is a high voltage, high output current operational
amplifier designed to drive resistive, inductive and capacitive
loads. For optimum linearity, especially at low levels, the
output stage is biased for class A/B operation using a ther-
mistor compensated base-emitter voltage multiplier circuit. A
thermal shutoff circuit protects against overheating and mini-
mizes heatsink requirements for abnormal operating condi-
tions. The safe operating area (SOA) can be observed for all
operating conditions by selection of user programmable cur-
rent limiting resistors. Both amplifiers are internally compen-
sated for all gain settings. For continuous operation under
load, a heatsink of proper rating is recommended.
This hybrid circuit utilizes thick film (cermet) resistors, ce-
ramic capacitors and semiconductor chips to maximize reli-
ability, minimize size and give top performance. Ultrasonically
bonded aluminum wires provide reliable interconnections at all
operating temperatures. The 8-pin TO-3 package is hermeti-
cally sealed and electrically isolated. The use of compressible
washers and/or improper mounting torque will void the product
warranty. Please see “General Operating Considerations”.
+V
R
CL–
.68
Ω
LIGHT
–32V
–V
PD1
PD2
Negates optoelectronic instabilities
Lead network minimizes overshoot
SEQUENTIAL POSITION CONTROL
Position is sensed by the differentially connected photo
diodes, a method that negates the time and temperature
variations of the optical components. Off center positions
produce an error current which is integrated by the op amp
circuit, driving the system back to center position. A momen-
tary switch contact forces the system out of lock and then the
integrating capacitor holds drive level while both diodes are in
a dark state. When the next index point arrives, the lead
network of C1 and R1 optimize system response by reducing
overshoot. The very low bias current of the PA07 augments
performance of the integrator circuit.
EQUIVALENT SCHEMATIC
3
7
Q1
Q5
Q8
Q9
C3
5
4
Q12A
Q15
Q18
D2
6
Q12B
Q10
C4
D3
Q17A
Q16
C2
Q7
1
Q11
Q19
8
Q17B
Q2
D1
Q4
Q3
C1
Q6A
Q6B
2
EXTERNAL CONNECTIONS
+V
S
3
CL+
2
1
R
CL+
OUT
OUTPUT
R
T
+IN
4
TOP VIEW
R
S
–IN
5
6
7
8
CL–
R
CL–
–V
S
BAL
R
S
= ( V
S
+ + –V
S
) R
T
/1.6
NOTE: Input offset voltage trim optional. R
T
= 10KΩ MAX
8-pin TO-3 package
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
PA07 • PA07A
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to –V
S
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal
1
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s
TEMPERATURE, junction
1
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
PA07
TEST CONDITIONS
2
MIN
TYP
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
100V
5A
67W
±50V
±V
S
300°C
200°C
–65 to +150°C
–55 to +125°C
PA07A
MAX
MIN
TYP
MAX
UNITS
SPECIFICATIONS
PARAMETER
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. power
BIAS CURRENT, initial
3
BIAS CURRENT,vs. supply
OFFSET CURRENT, initial
3
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE
4
COMMON MODE REJECTION, DC
GAIN
OPEN LOOP GAIN at 10Hz
T
C
= 25°C, R
L
= 15Ω
GAIN BANDWIDTH PRODUCT @ 1MHz T
C
= 25°C, R
L
= 15Ω
POWER BANDWIDTH
T
C
= 25°C, R
L
= 15Ω
PHASE MARGIN
Full temperature range, R
L
= 15Ω
OUTPUT
VOLTAGE SWING
4
VOLTAGE SWING
4
VOLTAGE SWING
4
CURRENT, peak
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD, unity gain
CAPACITIVE LOAD, gain>4
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
THERMAL
RESISTANCE, AC, junction to case
5
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
NOTES:
*
1.
2.
3.
4.
5.
F>60Hz
F<60Hz
Meets full range specifications
–25
Full temperature range
T
C
= 25°C
±12
Full temp. range, I
O
= 5A
Full temp. range, I
O
= 2A
Full temp. range, I
O
= 90mA
T
C
= 25°C
T
C
= 25°C, 2V step
T
C
= 25°C
Full temperature range
Full temperature range
±V
S
–5
±V
S
–5
±V
S
–5
5
92
T
C
= 25°C
Full temperature range
T
C
= 25°C
Full temperature range
T
C
= 25°C
T
C
= 25°C
T
C
= 25°C
T
C
= 25°C
T
C
= 25°C
Full temperature range
±V
S
–10
Full temperature range, V
CM
=
±20V
.5
10
8
20
5
.01
2.5
10
11
4
120
±2
30
50
50
*
±.25
5
*
10
3
*
1.5
*
*
*
±.5
10
10
10
mV
µV/°C
µV/V
µV/W
pA
pA/V
pA
Ω
pF
V
dB
98
1.3
18
70
*
*
*
*
*
dB
MHz
kHz
°
*
*
*
*
1.5
5
10
SOA
*
*
*
*
V
V
V
A
µs
V/µs
nF
±35
18
±50
30
*
*
*
*
*
V
mA
1.9
2.4
30
25
2.1
2.6
+85
*
*
*
*
*
*
*
*
°C/W
°C/W
°C/W
°C
The specification of PA07A is identical to the specification for PA07 in applicable column to the left.
Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF.
The power supply voltage for all specifications is the TYP rating unless otherwise noted as a test condition.
Doubles for every 10°C of temperature increase.
+V
S
and –V
S
denote the positive and negative supply rail respectively. Total V
S
is measured from +V
S
to –V
S
.
Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
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.
CAUTION
APEX MICROTECHNOLOGY CORPORATION
• 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE
GRAPHS
PA07 • PA07A
NORMALIZED BIAS CURRENT, I
B
(X)
256
64
16
4
1
.25
.06
–15
INTERNAL POWER DISSIPATION, P(W)
70
60
POWER DERATING
BIAS CURRENT
3.0
2.5
2.0
1.5
1.0
.5
CURRENT LIMIT
T = T
C
50
40
30
20
10
0
0
20 40 60 80 100 120 140
TEMPERATURE, T
C
(°C)
T = T
A
CURRENT LIMIT, I
LIM
(A)
R
CL
= 0.3
Ω
R
CL
= 0.6
Ω
25
5
45
65
85
TEMPERATURE, T
C
(°C)
105
0
0
25
75 100
–50 –25
50
CASE TEMPERATURE, T
C
(°C)
120
SMALL SIGNAL RESPONSE
0
–30
–60
PHASE RESPONSE
100
POWER RESPONSE
OUTPUT VOLTAGE, V
O
(V
PP
)
68
46
32
22
15
10
6.8
4.6
10K
20K 30K
50K 70K .1M
FREQUENCY, F (Hz)
|+V
S
| + |-V
S
| = 100V
|+V
S
| + |-V
S
| = 70V
OPEN LOOP GAIN, A
OL
(dB)
100
80
60
40
20
0
1
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
PHASE,
ϕ
(°)
–90
–120
–150
–180
–210
1
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
–20
COMMON MODE REJECTION, CMR (dB)
120
100
80
60
40
20
0
INPUT NOISE VOLTAGE, V
N
(nV/
√
Hz)
COMMON MODE REJECTION
8
PULSE RESPONSE
OUTPUT VOLTAGE, V
O
(V
PP
)
6
4
2
0
–2
–4
–6
–8
0
2
4 6
8 10 12
TIME, t (µs)
V
IN
= ±5V, t
r
= 100ns
20
INPUT NOISE
10
6
4
1
10 100 1K 10K .1M
FREQUENCY, F (Hz)
1M
2
10
100
10K
1K
FREQUENCY, F (Hz)
.1M
VOLTAGE DROP FROM SUPPLY, V
SAT
(V)
10
HARMONIC DISTORTION
G =10
NORMALIZED QUIESCENT CURRENT, I
Q
(X)
QUIESCENT CURRENT
1.6
1.4
1.2
1.0
.8
.6
T
C
= 25°C
OUTPUT VOLTAGE SWING
6
5
4
3
2
1
0
0
2
3
4
1
5
OUTPUT CURRENT, I
O
(A)
6
DISTORTION, THD (%)
3
8
Ω
=
,R
L
W
,R
=
1
8
Ω
T
C
= –25°C
–2
T
C
=
=
L
4
Ω
5°C
50
±3
.3
O
=
6V
,R
25°C
T
C
=
85°C
T
C
=
5V
m
,V
S
±2
L
.1
60
W
,V
=
50
T
C
= 85°C
=
W
P
S
=
.03
.01
100
P
O
°C
T
C
= 125
P
O
=
300 1K
3K 10K 30K .1M
FREQUENCY, F (Hz)
.4
50
60
70
80 90 100
40
TOTAL SUPPLY VOLTAGE, V
S
(V)
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
PA07 • PA07A
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, supplies, heat sinking, mount-
ing, current limit, SOA interpretation, and specification inter-
pretation. Visit www.apexmicrotech.com for design tools that
help automate tasks such as calculations for stability, internal
power dissipation, current limit; heat sink selection; Apex’s
complete Application Notes library; Technical Seminar Work-
book; and Evaluation Kits.
OPERATING
CONSIDERATIONS
2. The amplifier can handle any reactive or EMF generating
load and short circuits to the supply rail or common if the
current limits are set as follows at T
C
= 85°C:
±
V
S
50V
40V
30V
20V
15V
SHORT TO
±
V
S
C, L, OR EMF LOAD
.21A
.3A
.46A
.87A
1.4A
SHORT TO
COMMON
.61A
.87A
1.4A
2.5A
4.0A
SAFE OPERATING AREA (SOA)
The output stage of most power amplifiers has three distinct
limitations:
1. The current handling capability of the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter volt-
age exceed specified limits.
3. The junction temperature of the output transistors.
5.0
These simplified limits may be exceeded with further analysis
using the operating conditions for a specific application.
3. The output stage is protected against transient flyback.
However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
OUTPUT CURRENT FROM +V
S
OR – V
S
(A)
4.0
3.0
2.0
1.5
1.0
.8
.6
.4
.3
Tc
=8
5
°
C
25
ste
ad
Tc
ys
t=
ta
te
SE
5m
TH
=1
s
ER
°
C
t=
t=
1m
0 . 5
s
ms
BR
THERMAL SHUTDOWN PROTECTION
The thermal protection circuit shuts off the amplifier when
the substrate temperature exceeds approximately 150°C. This
allows heatsink selection to be based on normal operating
conditions while protecting the amplifier against excessive
junction temperature during temporary fault conditions.
Thermal protection is a fairly slow-acting circuit and there-
fore does not protect the amplifier against transient SOA
violations (areas outside of the T
C
= 25°C boundary). It is
designed to protect against short-term fault conditions that
result in high power dissipation within the amplifier. If the
conditions that cause thermal shutdown are not removed, the
amplifier will oscillate in and out of shutdown. This will result in
high peak power stresses, will destroy signal integrity and
reduce the reliability of the device.
MA
CO
L
ND
EA
KD
OW
N
.2
10
15
20
25 30 35 40
50 60 70 80 100
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE V
S
– V
O
(V)
SAFE OPERATING AREA CURVES
The SOA curves combine the effect of these limits. For a
given application, the direction and magnitude of the output
current should be calculated or measured and checked against
the SOA curves. This is simple for resistive loads but more
complex for reactive and EMF generating loads. However, the
following guidelines may save extensive analytical efforts.
1. For DC outputs, especially those resulting from fault condi-
tions, check worst case stress levels against the new SOA
graph.
For sine wave outputs, use Power Design
1
to plot a load
line. Make sure the load line does not cross the 0.5ms limit
and that excursions beyond any other second breakdown
line do not exceed the time label, and have a duty cycle of
no more than 10%.
For other waveform outputs, manual load line plotting is
recommended. Applications Note 22, SOA AND LOAD
LINES, will be helpful. A Spice type analysis can be very
useful in that a hardware setup often calls for instruments or
amplifiers with wide common mode rejection ranges.
PA07U REV. L FEBRUARY 2001
CURRENT LIMIT
Proper operation requires the use of two current limit resis-
tors, connected as shown in the external connections diagram.
The minimum value for R
CL
is .12Ω, however, for optimum
reliability it should be set as high as possible. Refer to the
“General Operating Considerations” section of the handbook
for current limit adjust details.
1
Note 1. Power Design is a self-extracting Excel spreadsheet
available free from www.apexmicrotech.com
This data sheet has been carefully
CORPORATION
• 5980 NORTH SHANNON ROAD
assumed for possible inaccuracies
• USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
APEX MICROTECHNOLOGY
checked and is believed to be reliable, however, no responsibility
•
is
TUCSON, ARIZONA 85741
or omissions. All specifications are subject to change without notice.
© 2001 Apex Microtechnology Corp.
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