APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
1
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
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 out-
put stage is biased for class A/B operation using a thermistor
compensated base-emitter voltage multiplier circuit. A thermal
shutoff circuit protects against overheating and minimizes
heatsink requirements for abnormal operating conditions. The
safe operating area (SOA) can be observed for all operating
conditions by selection of user programmable current limiting
resistors. Both amplifiers are internally compensated for all
gain settings. For continuous operation under load, a heatsink
of proper rating is recommended.
This hybrid circuit utilizes thick film (cermet) resistors, ceramic
capacitors and semiconductor chips to maximize reliability,
minimize size and give top performance. 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 washers
and/or improper mounting torque will void the product warranty.
Please see "General Operating Considerations".
EQUIVALENT SCHEMATIC
TYPICAL APPLICATION
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.
EXTERNAL CONNECTIONS
NOTE: Input offset voltage trim optional. R
T
= 10K MAX
8-PIN TO-3
PACKAGE STYLE CE
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
2
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to V
S
100V
OUTPUT CURRENT, within SOA
5A
POWER DISSIPATION, internal
1
67W
INPUT VOLTAGE, differential
50V
INPUT VOLTAGE, common mode
V
S
TEMPERATURE, pin solder - 10s
300C
TEMPERATURE, junction
1
200C
TEMPERATURE RANGE, storage
65 to +150C
OPERATING TEMPERATURE RANGE, case
55 to +125C
PA07
PA07A
PARAMETER
TEST CONDITIONS
2
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
INPUT
OFFSET VOLTAGE, initial
T
C
= 25C
.5
2
.25
.5
mV
OFFSET VOLTAGE, vs. temperature
Full temperature range
10
30
5
10
V/C
OFFSET VOLTAGE, vs. supply
T
C
= 25C
8
*
V/V
OFFSET VOLTAGE, vs. power
Full temperature range
20
10
V/W
BIAS CURRENT, initial
3
T
C
= 25C
5
50
3
10
pA
BIAS CURRENT,vs. supply
T
C
= 25C
.01
*
pA/V
OFFSET CURRENT, initial
3
T
C
= 25C
2.5
50
1.5
10
pA
INPUT IMPEDANCE, DC
T
C
= 25C
10
11
*
INPUT CAPACITANCE
T
C
= 25C
4
*
pF
COMMON MODE VOLTAGE RANGE
4
Full temperature range
V
S
10
*
V
COMMON MODE REJECTION, DC
Full temperature range, V
CM
= 20V
120
*
dB
GAIN
OPEN LOOP GAIN at 15Hz
T
C
= 25C, R
L
= 15
89
95
*
*
dB
GAIN BANDWIDTH PRODUCT @ 1MHz T
C
= 25C, R
L
= 15
1.3
*
MHz
POWER BANDWIDTH
T
C
= 25C, R
L
= 15
18
*
kHz
PHASE MARGIN
Full temperature range, R
L
= 15
70
*
OUTPUT
VOLTAGE SWING
4
Full temp. range, I
O
= 5A
V
S
5
*
V
VOLTAGE SWING
4
Full temp. range, I
O
= 2A
V
S
5
*
V
VOLTAGE SWING
4
Full temp. range, I
O
= 90mA
V
S
5
*
V
CURRENT, peak
T
C
= 25C
5
*
A
SETTLING TIME to .1%
T
C
= 25C, 2V step
1.5
*
s
SLEW RATE
T
C
= 25C
5
*
V/s
CAPACITIVE LOAD, unity gain
Full temperature range
1
*
nF
CAPACITIVE LOAD, gain>4
Full temperature range
SOA
*
POWER SUPPLY
VOLTAGE
Full temperature range
12
35
50
*
*
*
V
CURRENT, quiescent
T
C
= 25C
18
30
*
*
mA
THERMAL
RESISTANCE, AC, junction to case
5
F>60Hz
1.9
2.1
*
*
C/W
RESISTANCE, DC, junction to case
F<60Hz
2.4
2.6
*
*
C/W
RESISTANCE, junction to air
30
*
C/W
TEMPERATURE RANGE, case
Meets full range specifications
25
25
+85
*
*
*
C
NOTES: * The specification of PA07A is identical to the specification for PA07 in applicable column to the left.
1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF.
2. The power supply voltage for all specifications is the TYP rating unless otherwise noted as a test condition.
3. Doubles for every 10C of temperature increase.
4. +V
S
and V
S
denote the positive and negative supply rail respectively. Total V
S
is measured from +V
S
to V
S
.
5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
PA07 PA07A
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 850C to avoid generating toxic fumes.
CAUTION
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
3
TYPICAL PERFORMANCE
GRAPHS
PA07 PA07A
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
4
OPERATING
CONSIDERATIONS
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. 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
Workbook; and Evaluation Kits.
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 voltage
exceed specified limits.
3. The junction temperature of the output transistors.
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.
PA07 PA07A
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
= 85C:
SHORT TO V
S
SHORT TO
V
S
C, L, OR EMF LOAD
COMMON
50V
.21A
.61A
40V
.3A
.87A
30V
.46A
1.4A
20V
.87A
2.5A
15V
1.4A
4.0A
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.
THERMAL SHUTDOWN PROTECTION
The thermal protection circuit shuts off the amplifier when
the substrate temperature exceeds approximately 150C. 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 therefore
does not protect the amplifier against transient SOA violations
(areas outside of the T
C
= 25C 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.
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 .12, 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 checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA07U REV N JUNE 2003 2003 Apex Microtechnology Corp.
PDF 
ZIP