PA34CX [CIRRUS]
Operational Amplifier, 1 Func, 10000uV Offset-Max, BIPolar, PZFM7, STAGGERED, PLASTIC, TO-220, 7 PIN;
| 型号： | PA34CX |
| 厂家： | 
CIRRUS LOGIC |
| 描述： | Operational Amplifier, 1 Func, 10000uV Offset-Max, BIPolar, PZFM7, STAGGERED, PLASTIC, TO-220, 7 PIN 局域网 放大器 |
| 文件： | 总6页 (文件大小：253K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
POWER OPERATIONAL AMPLIFIER
PA34
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HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
Not recommended for new design in.
FEATURES
• LOW COST
• WIDE COMMON MODE RANGE Includes negative supply
• WIDE SUPPLY VOLTAGE RANGE
Single supply: 5V to 40V
Split supplies: 2ꢀ5V to 20V
• HIGH EFFICIENCY — |Vs–2ꢀ8V| at 2ꢀ5A typ
• HIGH OUTPUT CURRENT — 2ꢀ5A min
• INTERNAL CURRENT LIMIT
• LOW DISTORTION
• PACKAGING OPTIONS
7 TO-220 Plastic Package (PA34CD)
7 TO-220 with Staggered Lead Form (PA34CX)
7 DDPAK Surface Mount Package (PA34CC)
TYPICAL APPLICATION
Ref: APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifiers"
R2
R3
+28V
9K
+28V
10K
R4
APPLICATIONS
• HALF & FULL BRIDGE MOTOR DRIVERS
• AUDIO POWER AMPLIFIER
10K
R1
5K
R5
–
–
Unit B
+
10K
M
Unit A
+
• IDEAL FOR SINGLE SUPPLY SYSTEMS
5V Peripherals, 12V Automotive, 28V Avionic
PA34
1Ω
.1µF
PA34
1Ω
.1µF
R6
10K
COMMAND
INPUT
0/10V
DESCRIPTION
The PA34 consists of a monolithic power operational
amplifier in three standard package designs. The surface
mount version of the PA34, the PA34CC, is an industry
standard non-hermetic plastic 7-pin DDPAK.The through hole
versions of the PA34, the PA34CD and PA34CX, are industry
standard non-heremetic plastic 7-pin TO-220 packages. The
PA34CX is a staggered lead formed PA34CD and offers
industry standard 100 mil spacing. This allows for easier PC
board layout. (Please reference to the lead form datasheet
drawing LF005 for package dimensions of the PA34CX.
The wide common mode input range includes the negative
rail, facilitating single supply applications. It is possible
to have a "ground based" input driving a single supply
amplifier with ground acting as the "second" or "bottom"
supply of the amplifier.
BIDIRECTIONAL MOTOR DRIVE
E
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. Inputs less positive than 5V drive the motor in
the opposite direction. (See PA21/25/26/37 Datasheet for
additional application description.)
The output stage is also well protected. They possess
internalcurrentlimitcircuits.Whilethedeviceiswellprotected,
the Safe Operating Area (SOA) curve must be observed.
Proper heatsinking is required for maximum reliability.
The monolithic amplifier is directly attached to the metal
tabs of the PA34CC, PA34CD, and PA34CX. The metal tabs
are directly tied to -Vs.
EXTERNAL CONNECTIONS
PA34CD
PA34CX
PA34CC
VBOOST
EQUIVALENT SCHEMATIC
+VS
+IN
– IN
OUT
ISENSE
RS
– VS
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235
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA34
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, total
OUTPUT CURRENT
5V to 40V
SOA
POWER DISSIPATION, internal
INPUTVOLTAGE, differential
INPUT VOLTAGE, common mode
JUNCTION TEMPERATURE, max
TEMPERATURE, pin solder—10 sec max
TEMPERATURE RANGE, storage
18.5W
V
S
+V , -V –.5V
S
S
1
150°C
220°C
–65°C to 150°C
–40°C to 125°C
OPERATING TEMPERATURE RANGE, case
PA34
TYP
SPECIFICATIONS
PARAMETER
INPUT
2
TEST CONDITIONS
MIN
MAX
UNITS
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
BIAS CURRENT, initial
1.5
15
1000
10
mV
µV/°C
nA
Full temperature range
35
COMMON MODE RANGE
COMMON MODE REJECTION, DC
POWER SUPPLY REJECTION
Full temperature range
Full temperature range
Full temperature range
–V –.3
60
60
+V –2
S
dB
dB
dB
S
85
80
GAIN
OPEN LOOP GAIN
GAIN BANDWIDTH PRODUCT
PHASE MARGIN
Full temperature range
80
100
600
65
dB
kHz
°
A = 40dB
V
Full temperature range
= 28V
POWER BANDWIDTH
V
13.6
kHz
O(P-P)
OUTPUT
CURRENT, peak
SLEW RATE
CAPACITIVE LOAD DRIVE
VOLTAGE SWING
VOLTAGE SWING
VOLTAGE SWING
2.5
.5
A
V/µs
µF
V
V
V
1.2
.22
A = 1
V
Full temp. range, I = 100mA
|V | –1.0
|V | –0.8
O
S
S
Full temp. range, I = 1A
|V | –1.8
|V | –1.4
O
S
S
I
O
= 2.5A
|V | –3.0
|V | –2.8
S
S
POWER SUPPLY
3
VOLTAGE, V
5
30
45
40
90
V
mA
SS
CURRENT, quiescent, total
THERMAL
RESISTANCE, DC junction to case
RESISTANCE, AC junction to case
RESISTANCE, junction to air (CD,CX)
RESISTANCE, junction to air (CC)
TEMPERATURE RANGE, case
5.44
4.08
60
6.8
5.1
°C/W
°C/W
°C/W
°C/W
°C
4
27
Meets full range specifications
–25
85
NOTES:
1.
Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF.
2.
3.
4.
Unless otherwise noted, the following conditions apply:
V = 15V, T = 25°C.
S C
+V and –V denote the positive and negative supply rail respectively. V denotes the total rail-to-rail supply voltage.
S
S
SS
Heat tab attached to 3/32" FR-4 board with 2oz. copper. Topside copper area (heat tab directly attached) = 1000 sq. mm,
backside copper area = 2500 sq. mm, board area = 2500 sq. mm.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
236
TYPICAL PERFORMANCE
GRAPHS
PA34
POWER RESPONSE
POWER DERATING
BIAS CURRENT
1.75
50
40
20
18
16
14
12
10
1.5
1.25
1.0
30
25
20
15
8
.75
6
4
10
5
|+VS | + |–V | = 40V
S
.5
2
0
.25
–50 –25
100K
0
25
50
75
100 125
0
25 50 75 100 125
1K
10K
JUNCTION TEMPERATURE, T (°C)
CASE TEMPERATURE, TC (°C)
FREQUENCY, F (Hz)
SMALL SIGNAL RESPONSE
PHASE RESPONSE
0
100
80
–30
–60
60
–90
40
–120
–150
–180
–210
20
0
–20
E
1
10 100 1K 10K 100K 1M
FREQUENCY, F (Hz)
0
10 100 1K 10K .1M 1M
FREQUENCY, F (Hz)
OUTPUT VOLTAGE SWING
POWER SUPPLY REJECTION
PULSE RESPONSE
3.5
3
89
86
83
80
77
AV = 1
RL =10Ω
10
5
2.5
2
1.5
1
0
74
71
69
66
63
60
–5
–10
.5
0
2.5
3
3.5
0
.5
1
1.5
2
0
10 100 1K 10K 100K 1M
FREQUENCY, F (Hz)
0
200 400
600
800
1K
OUTPUT CURRENT, I (A)
TIME, t (µs)
O
HARMONIC DISTORTION
QUIESCENT CURRENT
3
1
125
40
35
AV = –10
VOUT = 16VPP
RL = 8Ω
100
75
50
25
0
30
25
20
15
.1
.01
–25
–50
10
5
.001
10
100
1K
10K 40K
.7 .8
.9
1
1.1 1.2 1.3 1.4
FREQUENCY, F (Hz)
NORMALIZED QUIESCENT CURRENT, I Q (X)
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237
OPERATING
CONSIDERATIONS
PA34
GENERAL
NOTE: Forprotectionagainstsustained, highenergyflyback,
external fast-recovery diodes should be used.
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.
MONOLITHIC AMPLIFIER
STABILITY CONSIDERATIONS
All monolithic power op amps use output stage topologies
that present special stability problems. This is primarily due
to non-complementary (both devices are NPN) output
stages with a mismatch in gain and phase response for
different polarities of output current. It is difficult for the
op amp manufacturer to optimize compensation for all
operating conditions.
The recommended R-C network of 1 ohm in series with
0.1µF from output to AC common (ground or a supply rail,
with adequate bypass capacitors) will prevent local output
stage oscillations.
The amplifiers are internally compensated for unity gain
stability, no additional compensation is required.
5
4
3
THERMAL CONSIDERATIONS
2
1
The PA34 may require a thermal washer which is electrically
insulating since the tab is tied to –V .Thiscanresultinthermal
S
impedances for R
of up to 1°C/W or greater.
θCS
The PA34CC 7-pin DDPAK surface mountable package
has a large exposed integrated copper heatslug to which the
monolithic amplifier is directly attached. The PA34CC requires
surface mount techniques of heatsinking. Asolder connection
to an area of 1 to 2 square inches of foil is recommended for
circuit board layouts. This may be adequate heatsinking but
the large number of variables involved suggests temperature
measurements to be made on the top of the package.
Surface mount techniques include the use of a surface
mount fan in combination with a surface mount heatsink
on the backside of the FR4/PC board. Do not allow the
temperature to exceed 85°C.
.1
1
2
3
4
5 6 7 8 9 10
20
30 40
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE VS –V (V)
O
SAFE OPERATING AREA (SOA)
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.
MOUNTING PRECAUTIONS
1. Always use a heat sink. Even unloaded, the PA34 can
dissipate up to 3.6 watts. A thermal washer or thermal
grease should always be used.
2. Avoid bending the leads. Such action can lead to internal
damage.
3. Always fasten the tab to the heat sink before the leads are
soldered to fixed terminals.
Under transient conditions, capacitive and dynamic*
inductive loads up to the following maximum are safe:
4. Strain relief must be provided if there is any probability of
axial stress to the leads.
Vs
CAPACITIVELOAD INDUCTIVE LOAD
20V
15V
10V
5V
200µF
500µF
5mF
7.5mH
25mH
35mH
150mH
ADDITIONAL PA34 PIN FUNCTIONS
50mF
V
BOOST
The V
pin is the positive terminal for the load of the
BOOST
* If the inductive load is driven near steady state conditions,
allowing the output voltage to drop more than 6V below the
supply rail while the amplifier is current limiting, the inductor
should be capacitively coupled or the supply voltage must be
lowered to meet SOA criteria.
second stage of the amplifier. When that terminal is connected
to a voltage greater than +V it will provide more drive to the
upperoutputtransistor,whichisadarlingtonconnectedemitter
follower. This will better saturate the output transistor.
S
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
238
OPERATING
CONSIDERATIONS
PA34
+VS ≤ 20V
When V
is about 5 Volts greater than +V the
S
BOOST
positive output can swing 0.5 Volts closer to the rail. This is
as much improvement as is possible.
DB1
DB2
V
pin requires approximately 10–12mA of current.
BOOST
Dynamically it represents 1K Ω impedance. The maximum
voltage that can be applied to V is 40 volts with
7
3
3
CB1
BOOST
respect to –V . There is no limit to the difference between
PA34
Unit 1
6
S
+V and V
.
S
BOOST
CB2
SPEAKER
Figure 1 shows a bootstrap which dynamically couples the
output waveform onto the V pin. This causes V
BOOST
BOOST
PA34
6
Unit 2
to swing positive from it's initial value, which is equal to +V
S
-0.7 V (one diode drop), an amount equal to the output. In
other words, if V was initially 19.3, and the output
BOOST
swings positive 18 Volts, the voltage on the V
FIGURE 1. SIMPLE BOOTSTRAPPING IMPROVES POSITIVE
OUTPUT SWING. TYPICAL CURRENTS ARE 12 A EACH.
pin
m
BOOST
will swing to 19.3 -0.7 + 18 or 36.6. The capacitor needs
to be sized based on a 1K Ω impedance and the lowest
frequency required by the circuit. For example, 20Hz will
require > 8uF.
+V
S
I
SENSE
The I
pin is in series with the negative half of the
SENSE
output stage only. Current will flow through this pin only when
negative current is being outputted. The current that flows
in this pin is the same current that flows in the output (if
B
A
V
–1A flows in the output, the I
current flow, if +1A flows in the output the I
have 0 current flow).
pin will have 1A of
BIAS
SENSE
R
R
pin will
SENSE
R
I
L
L
E
V
IN
The resistor choice is arbitrary and is selected to provide
whatever voltage drop the engineer desires, up to a maximum
of 1.0 volt. However, any voltage dropped across the resistor
will subract from the swing to rail. For instance, assume a
+/–12 volt power supply and a load that requires +/–1A. With
no current sense resistor the output could swing +/–10.2
volts. If a 1 Ω resistor is used for current sense (which
will drop 1 Volt at 1 Amp) then the output could swing
+10.2, –9.2 Volts.
R
FB
R
IN
R
IN
R
R
S
R
S
FB
V
–V OR GND
REF
S
Figure 2 shows the PA34 I
obtain aTransconductance function. In this example, amplifier
"A" is the master and amplifier "B" is the slave. Feedback
feature being used to
SENSE
FIGURE 2. I
AMPLIFIER
TRANSCONDUCTANCE BRIDGING
SENSE
from sensing resistors R is applied to the summing network
S
and scaled to the inverting input of amplifier "A" where it is
compared to the input voltage. The current sensing feedback
imparts a Transconductance feature to the amplifiers transfer
function. In other words, the voltage developed across the
sensing resistors is directly proportional to the output current.
Using this voltage as a feedback source allows expressing
the gain of the circuit in amperes vs input voltage. The transfer
funcion is approximately:
APPLICATION REFERENCES:
For additional technical information please refer to the
following Application Notes:
AN 1: General Operating Considerations
AN 3: Bridge Circuit Drives
AN 21:Single Supply Operation of Power Amplifiers
AN 24:Brush Type DC Motor Drive
I = (V – V
L IN
) *R / R / R
IN FB
REF
s
In the illustration, resistors R , R
IN
and R determine
S
FB
gain.
V
should be set midway between +V and -V , Vref
s s
BIAS
is usually ground in dual supply systems or used for level
translation in single supply systems.
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.
PA34U REV. D FEBRUARY 2003 © 2003 Apex Microtechnology Corp.
239
NOTES:
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
240
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