Apex PA61A, PA61 Datasheet
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM (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
POWER OPERATIONAL AMPLIFIERS
PA61 • PA61A
• PROGRAMMABLE POWER SUPPLY
• MOTOR/SYNCRO DRIVER
• VALVE AND ACTUATOR CONTROL
• DC OR AC POWER REGULATOR
• FIXED FREQUENCY POWER OSCILLATOR
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
3
Q1A
Q1B
2
4
A1
5
C1
6
Q3
Q4
Q6A
1
8
Q6B
R
F1
SENSE HI
+42V
±10V
R
DAC
FIGURE 1. PROGRAMMABLE POWER SUPPLY
WITH REMOTE SENSING
IN1
R
IN2
PA61
–42V
R
CL+
R
CL–
R
F2
R
W
OUT
RW
LOAD
SENSE LO
RTN
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 R
F/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
R
CL+
C
L+
3
TOP VIEW
6
S
2
7
N.C.
OUT
1
R
8
CL–
C
L–
OUTPUT
+IN
–IN
+V
S
4
5
–V
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
PA61 • PA61A
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –V
OUTPUT CURRENT, within SOA 10A
S
90V
POWER DISSIPATION, internal 97W
INPUT VOLTAGE, differential ±VS–3V
INPUT VOLTAGE, common mode ±V
TEMPERATURE, pin solder-10s 300°C
TEMPERATURE, junction
1
S
200°C
TEMPERATURE RANGE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C
SPECIFICATIONS
PARAMETER TEST CONDITIONS
PA61
2
MIN TYP MAX MIN TYP MAX UNITS
PA61A
INPUT
OFFSET VOLTAGE, initial TC = 25°C ±2 ±6 ±1 ±3mV
OFFSET VOLTAGE, vs. temperature Specified temperature range ±10 ±65 * ±40 µV/°C
OFFSET VOLTAGE, vs. supply TC = 25°C ±30 ±200 * * µV/V
OFFSET VOLTAGE, vs. power TC = 25°C ±20 * µV/W
BIAS CURRENT, initial TC = 25°C 1230 1020nA
BIAS CURRENT, vs. temperature Specified temperature range ±50 ±500 * * pA/°C
BIAS CURRENT, vs. supply TC = 25°C ±10 * pA/V
OFFSET CURRENT, initial TC = 25°C ±12 ±30 ±5 ±10 nA
OFFSET CURRENT, vs. temperature Specified temperature range ±50 * pA/°C
INPUT IMPEDANCE, DC TC = 25°C 200 * MΩ
INPUT CAPACITANCE TC = 25°C3*pF
COMMON MODE VOLTAGE RANGE3Specified temperature range ±VS–5 ±VS–3** V
COMMON MODE REJECTION, DC
3
Specified temperature range 74 100 * * dB
GAIN
OPEN LOOP GAIN at 10Hz Full temp. range, full load 96 108 * * dB
GAIN BANDWIDTH PRODUCT at 1MHz TC = 25°C, full load 1 * MHz
POWER BANDWIDTH TC = 25°C, IO = 8A, VO = 40V
PHASE MARGIN Full temperature range 45 * °
PP
10 16 * * kHz
OUTPUT
VOLTAGE SWING
VOLTAGE SWING
VOLTAGE SWING
3
3
3
TC = 25°C, IO = 10A ±VS–7 ±VS–5 ±VS–6* V
Full temp. range, IO = 4A ±VS–6 ±VS–4** V
Full temp. range, IO = 68mA ±VS–5* V
CURRENT TC = 25°C ±10 * A
SETTLING TIME to .1% TC = 25°C, 2V step 2 * µs
SLEW RATE TC = 25°C, RL = 6Ω 1.0 2.8 * * V/µs
CAPACITIVE LOAD, unit gain Full temperature range 1.5 * nF
CAPACITIVE LOAD, gain>4 Full temperature range SOA *
POWER SUPPLY
VOLTAGE Full temperature range ±10 ±32 ±45 * * * V
CURRENT, quiescent TC = 25°C310**mA
THERMAL
RESISTANCE, AC, junction to case
4
F > 60Hz 1.0 1.2 * * °C/W
RESISTANCE, DC, junction to case F < 60Hz 1.5 1.8 * * °C/W
RESISTANCE, junction to air 30 * °C/W
TEMPERATURE RANGE, case Meets full range specification –25 25 +85 * * * °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
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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.
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