ETC PA61

POWER OPERATIONAL AMPLIFIERS
PA61 • PA61A
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
• WIDE SUPPLY RANGE — ±10 to ±45V
• HIGH OUTPUT CURRENT — ±10A Peak
• LOW COST — Class “C” output stage
• LOW QUIESCENT CURRENT — 3mA
APPLICATIONS
• PROGRAMMABLE POWER SUPPLY
• MOTOR/SYNCRO DRIVER
• VALVE AND ACTUATOR CONTROL
• DC OR AC POWER REGULATOR
• FIXED FREQUENCY POWER OSCILLATOR
RF1 SENSE HI
+42V
RCL+
±10V RIN1
DAC
DESCRIPTION
RW
PA61
RIN2
OUT
RCL–
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
3
Q1A
LOAD
RF2 SENSE LO
–42V
RTN
RW
FIGURE 1. PROGRAMMABLE POWER SUPPLY
WITH REMOTE SENSING
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.
Q1B
2
EXTERNAL CONNECTIONS
Q3
RCL+
4
A1
CL+
1
+VS
5
3
2
1
Q4
+IN
C1
OUT
8
TOP VIEW
5
Q6A
Q6B
RCL–
–IN
6
–VS
6
OUTPUT
4
8
7
CL–
N.C.
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA61 • PA61A
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
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER
90V
10A
97W
±VS–3V
±VS
300°C
200°C
–65 to +150°C
–55 to +125°C
PA61
TEST CONDITIONS
2
PA61A
MIN
TYP
MAX
±6
±65
±200
±VS–5
74
±2
±10
±30
±20
12
±50
±10
±12
±50
200
3
±VS–3
100
MIN
TYP
MAX
UNITS
±3
±40
*
*
*
±1
*
*
*
10
*
*
±5
*
*
*
*
*
mV
µV/°C
µV/V
µV/W
nA
pA/°C
pA/V
nA
pA/°C
MΩ
pF
V
dB
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
30
±500
±30
20
*
±10
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
96
10
108
1
16
45
*
*
*
*
*
*
dB
MHz
kHz
°
*
*
V
V
V
A
µs
V/µs
nF
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
±VS–7
±VS–6
±VS–5
±10
1.0
±VS–5
±VS–4
±VS–6
*
*
*
2
2.8
*
*
*
1.5
SOA
*
*
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
Full temperature range
TC = 25°C
±10
±32
3
±45
10
1.0
1.5
30
25
1.2
1.8
*
*
*
*
*
V
mA
*
*
*
*
*
*
°C/W
°C/W
°C/W
°C
THERMAL
RESISTANCE, AC, junction to case4
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
NOTES:
*
1.
2.
3.
4.
CAUTION
F > 60Hz
F < 60Hz
Meets full range specification
–25
+85
*
*
The specification of PA61A is identical to the specification for PA61 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 noted as a test condition.
+VS and –VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS.
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.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
PA61 • PA61A
OUTPUT VOLTAGE SWING
POWER DERATING
60
40
20
0
0
25
50
75 100 125 150
TEMPERATURE, TC (°C)
SMALL SIGNAL RESPONSE
5.0
6
4.5
4.0
2.5
–60
PHASE, Φ (°)
80
–150
0
–180
0
5
2
0
–25
2
4
6
8
10
OUTPUT CURRENT, I O (A)
80
0
–2
–4
–6
–8
0
2
4
6
8 10 12 14
TIME, t (µs)
HARMONIC DISTORTION
10
VS = ±36
RL = 4 Ω
AV = 10
1W
1
PO
=.
.3
PO
.1
PO
.03
30
=
=
5W
50
W
100 300 1K 3K 10K 30K
FREQUENCY, F (Hz)
100
80
60
40
20
0
1
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
QUIESCENT CURRENT
1.6
1.4
1.2
1.0
TC = 125°C
T C = 25°C
°C
.8
TC
=
5
–5
.6
.4
20 30 40 50 60 70 80 90
TOTAL SUPPLY VOLTAGE, VS (V)
RCL = 0.3
Ω
0
25
75 100 125
50
CASE TEMPERATURE, TC (°C)
POWER RESPONSE
VS = ±40V
41
RL = 8 Ω
30
21
15
11
8
10K
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
COMMON MODE REJECTION
2Ω
58
NORMALIZED BIAS CURRENT, IB (X)
2
120
= .1
1
RL = 3 Ω
20K 30K
50K 70K
FREQUENCY, F (Hz)
.1M
BIAS CURRENT
2.5
2.2
1.9
1.6
1.3
1.0
INPUT NOISE VOLTAGE, VN (nV/ √ Hz)
4
COMMON MODE REJECTION, CMR(dB)
RL = 5 Ω
AV = +1
6
NORMALIZED QUIESCENT CURRENT, IQ (X)
PULSE RESPONSE
L
3
PHASE RESPONSE
1
RC
4
–210
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
8
OUTPUT VOLTAGE, VO (V)
5°C
to 8
–90
20
–20
1
DISTORTION, (%)
TC
5°
=2
–120
40
.01
=–
3.0
–30
3
TC
3.5
100
60
C
25°
0
120
OPEN LOOP GAIN, AOL (dB)
7
CURRENT LIMIT, I LIM (A)
T = TC
80
CURRENT LIMIT
5.5
OUTPUT VOLTAGE, VO (VPP )
100
VOLTAGE DROP FROM SUPPLY (V)
INTERNAL POWER DISSIPATION, P (W)
TYPICAL PERFORMANCE
GRAPHS
.7
.4
25 50 75 100 125
–50 –25 0
CASE TEMPERATURE, TC (°C)
100
INPUT NOISE
70
50
40
30
20
10
10
1K
100
10K
FREQUENCY, F (Hz)
.1M
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
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)
The output stage of most power amplifiers has 3 distinct
limitations:
SAFE OPERATING AREA (SOA)
5m
1m
s
1.0
.8
.6
t=
s
e
s
at
5m
St
dy
ea
St
2.0
1.5
Tc=2
5°C
Tc=8
5°C
Tc=1
25°C
.4
.3
.2
.1
10
INDUCTIVE LOAD
ILIM = 5A
ILIM = 10A
8mH
2.8mH
11mH
4.3mH
20mH
5.0mH
35mH
6.2mH
50mH
15mH
400mH
20mH
**
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.
0.
4.0
3.0
CAPACITIVE LOAD
VS ILIM = 5A ILIM = 10A
45V 200 F
150 F
40V 400 F
200 F
35V 800 F
400 F
30V 1600 F
800 F
25V 5.0mF
2.5mF
20V 10mF
5.0mF
15V
20mF
10mF
t=
10
8.0
6.0
t=
INPUT CURRENT FROM +VS OR –VS (A)
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.
1. Under transient conditions, capacitive and dynamic* inductive loads up to the following maximum are safe:
15
20
25 30
40
50 60 70 80 90
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE VS – VO (V)
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.
±VS
45V
40V
35V
30V
25V
20V
15V
SHORT TO VS ±
C, L, OR EMF LOAD
0.1A
0.2A
0.3A
0.5A
1.2A
1.5A
2.0A
SHORT TO
COMMON
1.3A
1.5A
1.6A
2.0A
2.4A
3.0A
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 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
PA61U REV. H JANUARY 2001
© 2001 Apex Microtechnology Corp.