APEX PA61

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FEATURES
• WIDE SUPPLY RANGE — ±10 to ±45V
• HIGH OUTPUT CURRENT — ±10A Peak
• LOW COST — Class “C” output stage
• LOW QUIESCENT CURRENT — 3mA
APPLICATIONS
8-PIN TO-3
PACKAGE STYLE CE
• PROGRAMMABLE POWER SUPPLY
• MOTOR/SYNCRO DRIVER
• VALVE AND ACTUATOR CONTROL
• DC OR AC POWER REGULATOR
• FIXED FREQUENCY POWER OSCILLATOR
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DESCRIPTION
The PA61 and PA61A are high output current operational
amplifiers designed to drive resistive, inductive and capacitive loads. Their complementary emitter follower output stage
is the simple class C type and optimized for low frequency
applications where crossover distortion is not critical. These
amplifiers are not recommended for audio, transducer or
deflection coil drive circuits above 1kHz or when distortion is
critical. The safe operating area (SOA) is fully specified and
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, mounting on a heatsink of proper
rating is recommended.
This hybrid circuit utilizes thick film conductors, 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 electrically isolated and hermetically sealed. The use of compressible thermal washers and/or improper mounting torque
voids the product warranty. Please see “General Operating
Considerations”.
EQUIVALENT SCHEMATIC
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TYPICAL APPLICATION
Due to its high current drive capability, PA61 applications
often utilize remote sensing to compensate IR drops in the wiring. The importance of remote sensing increases as accuracy
requirements, output currents, and distance between amplifier and load go up. The circuit above shows wire resistance
from the PA61 to the load and back to the local ground via
the power return line. Without remote sensing, a 7.5A load
current across only 0.05 ohm in each line would produce a
0.75V error at the load.
With the addition of the second ratio matched RF/RIN pair
and two low current sense wires, IR drops in the power return
line become common mode voltages for which the op amp
has a very high rejection ratio. Voltage drops in the output and
power return wires are inside the feedback loop. Therefore, as
long as the Power Op Amp has the voltage drive capability to
overcome the IR losses, accuracy remains the same. Application Note 7 presents a general discussion of PPS circuits.
EXTERNAL CONNECTIONS
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
PA61 • PA61A
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder-10s
TEMPERATURE, junction1
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 2
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. power
BIAS CURRENT, initial
BIAS CURRENT, vs. temperature
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
OFFSET CURRENT, vs. temperature
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE3
COMMON MODE REJECTION, DC3
TC = 25°C
Specified temperature range
TC = 25°C
TC = 25°C
TC = 25°C
Specified temperature range
TC = 25°C
TC = 25°C
Specified temperature range
TC = 25°C
TC = 25°C
Specified temperature range
Specified temperature range
GAIN
OPEN LOOP GAIN at 10Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH
PHASE MARGIN
Full temp. range, full load
TC = 25°C, full load
TC = 25°C, IO = 8A, VO = 40VPP
Full temperature range
OUTPUT
VOLTAGE SWING3
VOLTAGE SWING3
VOLTAGE SWING3
CURRENT
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD, unit gain
CAPACITIVE LOAD, gain>4
TC = 25°C, IO = 10A
Full temp. range, IO = 4A
Full temp. range, IO = 68mA
TC = 25°C
TC = 25°C, 2V step
TC = 25°C, RL = 6Ω
Full temperature range
Full temperature range
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
Full temperature range
TC = 25°C
THERMAL
RESISTANCE, AC, junction to case4
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
MIN
PA61
TYP
±VS–5
74
±2
±10
±30
±20
12
±50
±10
±12
±50
200
3
±VS–3
100
96
10
±VS–7
±VS–6
±VS–5
±10
1.0
±10
F > 60Hz
F < 60Hz
Meets full range specification
–25
90V
10A
97W
±VS–3V
±VS
300°C
200°C
–65 to +150°C
–55 to +125°C
MAX
PA61A
TYP
*
*
±1
*
*
*
10
*
*
±5
*
*
*
*
*
±6
±65
±200
30
±500
±30
108
1
16
45
*
*
±VS–5
±VS–4
2
2.8
MIN
±VS–6
*
*
*
1.5
SOA
±32
3
±45
10
1.0
1.5
30
25
1.2
1.8
+85
*
*
*
MAX
UNITS
±4
±40
*
mV
µV/°C
µV/V
µV/W
nA
pA/°C
pA/V
nA
pA/°C
MΩ
pF
V
dB
20
*
±10
*
*
*
*
dB
MHz
kHz
°
*
*
V
V
V
A
µs
V/µs
nF
*
*
*
*
*
*
*
*
V
mA
*
*
*
*
*
*
°C/W
°C/W
°C/W
°C
*
NOTES: * The specification of PA61A is identical to the specification for PA61 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 noted as a test condition.
3. +VS and –VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS.
4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
CAUTION
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
2
TYPICAL PERFORMANCE
GRAPHS
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PA61 • PA61A
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
OPERATING
CONSIDERATIONS
PA61 • PA61A
GENERAL
Please read Application Note 1 "General Operating Considerations" 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 and heat sink selection.
The "Application Notes" and "Technical Seminar" sections
contain a wealth of information on specific types of applications.
Package outlines, heat sinks, mounting hardware and other
accessories are located in the "Packages and Accessories"
section. Evaluation Kits are available for most Apex product
models, consult the "Evaluation Kit" section for details. For
the most current version of all Apex product data sheets, visit
www.apexmicrotech.com.
SAFE OPERATING AREA (SOA)
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The output stage of most power amplifiers has 3 distinct
limitations:
1. The current handling capability of the transistor geometry
and the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
3. The junction temperature of the output transistors.
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The SOA curves combine the effect of all limits for this Power
Op Amp. 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. The following guidelines may save extensive analytical efforts.
1. Under transient conditions, capacitive and dynamic* inductive loads up to the following maximum are safe:
CAPACITIVE LOAD
INDUCTIVE LOAD
VS
ILIM = 5A
ILIM = 10A
ILIM = 5A
ILIM = 10A
45V
200 F
150 F
8mH
2.8mH
40V
400 F
200 F
11mH
4.3mH
35V
800 F
400 F
20mH
5.0mH
30V
1600 F
800 F
35mH
6.2mH
25V
5.0mF
2.5mF
50mH
15mH
20V
10mF
5.0mF
400mH
20mH
15V
20mF
10mF
**
100mH
* If the inductive load is driven near steady state conditions,
allowing the output voltage to drop more than 8V below the
supply rail with ILIM = 10A or 15V below the supply rail with
ILIM = 5A while the amplifier is current limiting, the inductor
should be capacitively coupled or the current limit must be
lowered to meet SOA criteria.
** Second breakdown effect imposes no limitation but thermal
limitations must still be observed.
2. The amplifier can handle any EMF generating or reactive
load and short circuits to the supply rail or shorts to common
if the current limits are set as follows at TC=85°C.
SHORT TO VS ±
SHORT TO
C, L, OR EMF LOAD
COMMON
±VS
45V
0.1A
1.3A
40V
0.2A
1.5A
35V
0.3A
1.6A
30V
0.5A
2.0A
25V
1.2A
2.4A
20V
1.5A
3.0A
15V
2.0A
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.
This data
sheet has been carefully CORPORATION
checked and is believed
to be NORTH
reliable, however,
no responsibility
assumed for
possible inaccuracies
omissions.
All specifications HOTLINE:
are subject to1change
without
notice.
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • is
TUCSON,
ARIZONA
85741 •orUSA
• APPLICATIONS
(800)
546-2739
4
PA61U REV I OCTOBER 2003
© 2003 Apex Microtechnology Corp.