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FEATURES
• HIGH POWER BANDWIDTH — 350kHz
• HIGH SLEW RATE — 20V/µs
• FAST SETTLING TIME — 600ns
• LOW CROSSOVER DISTORTION — Class A/B
• LOW INTERNAL LOSSES — 1.2V at 2A
• HIGH OUTPUT CURRENT — ±5A PEAK
• LOW INPUT BIAS CURRENT — FET Input
• ISOLATED CASE — 300 VDC
APPLICATIONS
• MOTOR, VALVE AND ACTUATOR CONTROL
• MAGNETIC DEFLECTION CIRCUITS UP TO 5A
• POWER TRANSDUCERS UP TO 350 kHz
• AUDIO AMPLIFIERS UP TO 30W RMS
DESCRIPTION
The PA02 and PA02A are wideband, high output current
operational amplifiers designed to drive resistive, inductive
and capacitive loads. Their complementary “collector output”
stage can swing close to the supply rails and is protected
against inductive kickback. For optimum linearity, the output
stage is biased for class A/B operation. The safe operating
area (SOA) can be observed for all operating conditions by
selection of user programmable, current limiting resistors
(down to 10mA). Both amplifiers are internally compensated
but are not recommended for use as unity gain followers. For
continuous operation under load, mounting on a heatsink of
proper rating is recommended.
These hybrid integrated circuits utilize thick film (cermet)
resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections at all operating temperatures. The 8-pin TO-3
package is hermetically sealed and electrically isolated. Iso-
lation washers are not recommended. The use of compress-
ible thermal washers and/or improper mounting torque will
void the product warranty. Please see “General Operating
Considerations”.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATION
Vehicular Sound System Power Stage
LOW INTERNAL LOSS MAXIMIZES EFFICIENCY
When system voltages are low and power is at a premium,
the PA02 is a natural choice. The circuit above utilizes not only
the feature of low internal loss of the PA02, but also its very
low distortion level to implement a crystal clear audio amplifier
suitable even for airborne applications. This circuit uses AC
coupling of both the input signal and the gain circuit to render
DC voltage across the speaker insignificant. The resistor and
capacitor across the inputs form a stability enhancement net-
work. The 0.27 ohm current limit resistors provide protection
in the event of an output short circuit.
EXTERNAL CONNECTIONS
8-PIN TO-3
PACKAGE STYLE CE
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS 38V
OUTPUT CURRENT, within SOA 5A
POWER DISSIPATION, internal1 48W
INPUT VOLTAGE, differential ±VS –5V
INPUT VOLTAGE, common mode ±VS –2V
TEMPERATURE, pin solder - 10s 300°C
TEMPERATURE, junction1 150°C
TEMPERATURE RANGE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C
PA02 • PA02A
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
SPECIFICATIONS
PA02 PA02A
PARAMETER TEST CONDITIONS 2, 6 MIN TYP MAX MIN TYP MAX UNITS
INPUT
OFFSET VOLTAGE, initial TC = 25°C ±5 ±10 ±1 ±3 mV
OFFSET VOLTAGE, vs. temperature Full temperature range ±10 ±50 * ±25 µV/°C
OFFSET VOLTAGE, vs. supply TC = 25°C ±10 * µV/V
OFFSET VOLTAGE, vs. power TC = 25°C ±6 * µV/W
BIAS CURRENT, initial TC = 25°C 50 200 25 100 pA
BIAS CURRENT, vs. temperature TC = 85°C 200 * pA/°C
BIAS CURRENT, vs. supply TC = 25°C .01 * pA/V
OFFSET CURRENT, initial TC = 25°C 25 100 15 50 pA
OFFSET CURRENT, vs. temperature TC = 85°C 100 * pA/°C
INPUT IMPEDANCE, DC TC = 25°C 1000 * GΩ
INPUT CAPACITANCE TC = 25°C 3 * pF
COMMON MODE VOLT. RANGE5, Pos. Full temperature range +VS –6 +VS –3 * * V
COMMON MODE VOLT. RANGE5, Neg. Full temperature range –VS +6 –VS +5 * * V
COMMON MODE REJECTION, DC Full temperature range 70 100 * * dB
GAIN
OPEN LOOP GAIN at 10Hz TC = 25°C, 1kΩ load 103 * dB
OPEN LOOP GAIN at 10Hz Full temp. range, 10kΩ load 86 100 * * dB
GAIN BANDWIDTH PRODUCT at 1MHz TC = 25°C, 10Ω load 4.5 * MHz
POWER BANDWIDTH TC = 25°C, 10Ω load 350 * kHz
PHASE MARGIN Full temp. range, 10Ω load 30 * °
OUTPUT
VOLTAGE SWING3 TC = 25°C, IO = 5A, RCL = .08Ω ±VS –4 ±VS –3 * * V
VOLTAGE SWING3 Full temp. range, IO = 2A ±VS –2 ±VS –1.2 * * V
CURRENT, peak TC = 25°C 5 * A
SETTLING TIME to .1% TC = 25°C, 2V step .6 * µs
SLEW RATE TC = 25°C 13 20 * * V/µs
CAPACITIVE LOAD Full temp. range, AV > 10 SOA *
HARMONIC DISTORTION PO = .5W, F = 1kHz, RL = 10Ω .004 * %
SMALL SIGNAL rise/fall time RL = 10Ω, AV = 1 100 * ns
SMALL SIGNAL overshoot RL = 10Ω, AV = 1 10 * %
POWER SUPPLY
VOLTAGE Full temperature range ±7 ±15 ±19 * * * V
CURRENT, quiescent TC = 25°C 27 40 * * mA
THERMAL
RESISTANCE, AC junction to case4 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 +85 –55 +125 °C
NOTES: * The specification of PA02A is identical to the specification for PA02 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. +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.
5. Exceeding CMV range can cause the output to latch.
6. Full temperature specifications are guaranteed but not 100% tested.
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
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TYPICAL PERFORMANCE
GRAPHS PA02 • PA02A
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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OPERATING
CONSIDERATIONS
PA02 • PA02A
GENERAL
Please read Application Note 1 "General Operating Considerations" which cov-
ers 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
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 cal-
culated 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* loads
up to the following maximums
are safe:
CAPACITIVE LOAD INDUCTIVE LOAD
±VS ILIM = 2A ILIM = 5A ILIM = 2A ILIM = 5A
18V 2mF 0.7mF .2H 10mH
15V 10mF 2.2mF .7H 25mH
10V 25mF 10mF 5H 50mH
* 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 = 5A, or 17V below the
supply rail with ILIM = 2A while the amplifier is current limiting, the inductor should
be capacitively coupled or the current limit must be lowered to meet SOA criteria.
2. The amplifier can handle any EMF generating or reactive load and short circuits
to the supply rails or shorts to common if the current limits are set as follows at
TC = 85°C.
SHORT TO ±VS SHORT TO
±VS C, L OR EMF LOAD COMMON
18V .5A 1.7A
15V .7A 2.8A
10V 1.6A 4.2A
These simplified limits may be exceeded with further analysis using the operating
conditions for a specific application.
CURRENT LIMIT
Proper operation requires the use of two current limit resistors, connected as shown
in the external connection diagram. The minimum value for RCL is 0.12 ohm, 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.
DEVICE MOUNTING
The case (mounting flange) is electrically isolated and should be mounted directly to a
heatsink with thermal compound. Screws with Belville spring washers are recommended
to maintain positive clamping pressure on heatsink mounting surfaces. Long periods
of thermal cycling can loosen mounting screws and increase thermal resistance.
Since the case is electrically isolated (floating) with respect to the internal circuits it
is recommended to connect it to common or other convenient AC ground potential.
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.
PA02U REV. L FEBRUARY 1998 © 1998 Apex Microtechnology Corp.
