PA74A [APEX]
POWER DUAL OPERATIONAL AMPLIFIERS; 功率双路运算放大器
| 型号： | PA74A |
| 厂家： | 
CIRRUS LOGIC |
| 描述： | POWER DUAL OPERATIONAL AMPLIFIERS |
| 文件： | 总4页 (文件大小：290K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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FEATURES
• LOW COST
• WIDE COMMON MODE RANGE —
Includes negative supply
• WIDE SUPPLY VOLTAGE RANGE
Single supply: 5V to 40V
Split supplies: ±2.5V to ±20V
8-PIN TO-3
• HIGH EFFICIENCY — |Vs–2.2V| at 2.5A typ
• HIGH OUTPUT CURRENT — 3A
• LOW DISTORTION
PACKAGE STYLE CE
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APPLICATIONS
• HALF & FULL BRIDGE MOTOR DRIVERS
• AUDIO POWER AMPLIFIER
STEREO — 30W RMS per channel
BRIDGE — 60W RMS per package
• IDEAL FOR SINGLE SUPPLY SYSTEMS
5V — Peripherals, 12V — Automotive
28V — Avionic
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FIGURE 1: BIDIRECTIONAL
SPEED CONTROL FROM A
SINGLE SUPPLY.
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TYPICAL APPLICATION
DESCRIPTION
R1 and R2 set up amplifier A in a non-inverting gain of 2.8.
Amp B is set up as a unity gain inverter driven from the output
of amp A. Note that amp B inverts signals about the reference
node, which is set at mid-supply (14V) by R5 and R6. When
the command input is 5V, the output of amp A is 14V. Since
this is equal to the reference node voltage, the output of amp
B is also 14V, resulting in 0V across the motor. Inputs more
positive than 5V result in motor current flow from left to right
(see Figure 1). Inputs less positive than 5V drive the motor in
the opposite direction.
The amplifiers are especially well-suited for this application.
Theextendedcommonmoderangeallowscommandinputsas
low as 0V. Its superior output swing abilities let it drive within
2V of supply at an output current of 2A. This means that a
command input that ranges from 0.714V to 9.286V will drive a
24V motor from full scale CCW to full scale CW at up to ±2A. A
single power op amp with an output swing capability of Vs –6
would require ±30V supplies and would be required to swing
48V p-p at twice the speed to deliver an equivalent drive.
Theamplifierdesignconsistsofdualmonolithicinputandoutput
stages to achieve the desired input and output characteristics
of the PA74 and PA76. The input stage utilizes a dual power op
amp on a single chip monolithic that drives the output stages.
The output stages are configured in a non inverting unity gain
buffer configuration. The output stages of the amplifier are also
compensatedforstability.ThePA74andPA76dualamplifiersare
designedwithbothmonolithicandhybridtechnologiesproviding
acosteffectivesolutionforapplicationsrequiringmultipleampli-
fiers per board or bridge mode configurations. Both amplifiers
are internally compensated but are not recommended for use
as unity gain followers.
Thisdualhybridcircuitutilizesaberyllia(BeO)substrate,thick
film resistors, ceramic capacitors and monolithic amplifiers to
maximizereliabilityandpowerhandlingcapability,minimizesize
andgivetopperformance.Ultrasonicallybondedaluminumwires
provide reliable interconnections at all operating temperatures.
The 8-Pin TO-3 package is hermetically sealed and electrically
isolated. The use of compressible isolation washers voids the
warranty.
EXTERNAL CONNECTIONS (TOP VIEWS)
EQUIVALENT SCHEMATIC ONE CHANNEL
PA74
PA76
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA74/76 • PA74A/PA76A
SUPPLY VOLTAGE, total
OUTPUT CURRENT
5V to 40V
SOA
ABSOLUTE MAXIMUM RATINGS
POWER DISSIPATION, internal (per amplifier)
POWER DISSIPATION, internal (both amplifiers)
INPUT VOLTAGE, differential
36W
60W
±VS
INPUT VOLTAGE, common mode
JUNCTION TEMPERATURE, max1
TEMPERATURE, pin solder–10 sec max
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
+VS, -VS–0.5V
150°C
300°C
–65°C to 150°C
–55°C to 125°C
SPECIFICATIONS
PA74/76
TYP
PA74A/PA76A
PARAMETER
TEST CONDITIONS2
MIN
MAX
MIN
TYP
MAX
UNITS
INPUT
OFFSET VOLTAGE, initial
1.5
20
100
10
.5
10
*
7
mV
µV/°C
nA
V
dB
dB
dB
OFFSET VOLTAGE, vs. temperature Full temperature range
BIAS CURRENT, initial
COMMON MODE RANGE
500
+VS–1.3
250
*
Full temperature range
–VS
60
60
*
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COMMON MODE REJECTION, DC Full temperature range
70
90
70
*
*
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POWER SUPPLY REJECTION
CHANNEL SEPARATION
INPUT NOISE VOLTAGE
Full temperature range
IOUT = 1A, F = 1kHz
RS = 100Ω, f = 1 to 100KHz
50
GAIN
OPEN LOOP GAIN
GAIN BANDWIDTH PRODUCT
POWER BANDWIDTH
Full temperature range
AV = 40dB
VO(P-P) = 28V
89
0.9
100
1.4
13.6
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MHz
kHz
OUTPUT
CURRENT, peak
SLEW RATE
VOLTAGE SWING
VOLTAGE SWING
VOLTAGE SWING
VOLTAGE SWING
2.5
0.5
3
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A
V/µs
V
V
V
1.4
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Full temp. range, IO = 100mA |VS| –1.1 |VS| –0.9
Full temp. range, IO = 1A
IO = 2.5A (PA74, 76)
IO = 3.0A (PA74A, PA76A)
|VS| –2.0 |VS| –1.7
|VS| –3.5 |VS| –2.9
|VS| –4.0 |VS| –3.3
V
POWER SUPPLY
VOLTAGE, VSS3
30
18
40
40
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V
mA
CURRENT, quiescent, total
THERMAL
RESISTANCE, junction to case
DC, single amplifier
3.2
1.9
2.4
1.4
3.5
2.1
2.6
1.6
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°C/W
°C/W
°C/W
°C/W
°C/W
°C
DC, both amplifiers4
AC, single amplifier
AC, both amplifiers4
RESISTANCE, junction to air
TEMPERATURE RANGE, case
30
Meets full range specifications
–25
85
–25
85
NOTES:
*
The specification of PA74A/PA76A is identical to the specification for PA74/PA76 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. Unless otherwise noted, the following conditions apply: ±VS = ±15V, TC = 25°C.
3. +VS and –VS denote the positive and negative supply rail respectively. VSS denotes the total rail-to-rail supply voltage.
4. Rating applies when power dissipation is equal in the two amplifiers.
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
2APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE
GRAPHS
PA74/76 • PA74A/PA76A
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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
PA74/76 • PA74A/PA76A
GENERAL
PARALLEL CONFIGURATION CONSIDERATIONS
PleasereadApplicationNote1"GeneralOperatingConsider-
ations"whichcoversstability,supplies,heatsinking,mounting,
SOAinterpretation,andspecificationinterpretation.Visitwww.
apexmicrotech.com for design tools that help automate tasks
such as calculations for stability, internal power dissipation,
heatsink selection; Apex's complete Application Notes library;
Technical Seminar Workbook; and Evaluation Kits.
LOSSES
The PA74 and PA76 utilize a parallel configuration to
achieve the desired current output requirements. The paral-
lel configuration inherently creates internal losses due to
circulating currents. The circulating currents generate power
losses through the current sharing resistors when delivering
current to the load.
STABILITY CONSIDERATIONS
SUPPLY CURRENT
All monolithic power op amps use output stage topologies
that present special stability problems. This is primarily due to
non-complementary(bothdevicesareNPN)outputstageswith
a mismatch in gain and phase response for different polarities
of output current. It is difficult for the opamp manufacturer to
optimize compensation for all operating conditions.
The parallel configuration used in the PA74 and PA76 also
generates supply currents while high voltage sign waves
are seen at the output. Listed below are the supply currents
expected while running at a particular frequency and when VO
≈ 15Vpp, note that the outputs are not loaded.
Frequency
100Hz
1KHz
Supply Current
18mA
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5KHz
10KHz
15KHz
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SATURATION OPERATION
The parallel configuration used in the PA74 and PA76 is
sensitive to operation in the saturation region. The PA74 and
PA76 may exhibit large peak currents; this is mainly due to
thermal protection limitations.
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TheSOAcurvescombinetheeffectofalllimitsforthispower
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.
THERMAL CONSIDERATIONS
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ThermalgreaseoranApexTW03thermalwasher, RCS=.1
to .2°C/W, is the only recommended interface for the PA74/76.
Internal power dissipation increases directly with frequency
therefore it is critical to sufficiently heat sink the PA74 and
PA76. Even unloaded the PA74 and PA76 can dissipate up
to 3 watts while running at higher frequencies.
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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.
4
PA74–76U REV C NOVEMBER 2004
© 2004 Apex Microtechnology Corp.
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