CIRRUS PA162

PA162
PA162
P r o d u c t IInnnnoovvaa t i o n F Fr roomm
Power Operational Amplifiers
FEATURES
DESCRIPTION
♦ LOW COST
♦ WIDE BANDWIDTH - 1.1 Mhz
♦ HIGH OUTPUT CURRENT - 1.5A PER AMPLIFIER
♦ WIDE COMMON MODE RANGE Includes negative
supply
♦ WIDE SUPPLY VOLTAGE RANGE Single supply:
5V to 40V Split supplies: ± 2.5V to ± 20V
♦ LOW QUIESCIENT CURRENT
♦ VERY LOW DISTORTION
The amplifier design is a dual power op amp on a
single monolithic die. The quad output PA162 combines two dual op amp die in a single PSOP package. This approach provides a cost-effective solution to applications where multiple amplifiers are
required or a bridge configuration is needed. Four
independent amplifiers coupled with low quiescent
current and very low THD makes this an ideal lowdistortion 4-channel audio amplifier for applications
such as laptops and computer speakers.
APPLICATIONS
The quad output PA162DK is available in a surface
mount 20-pin PSOP, JEDEC MO-166-AB package.
Built-in thermal shutdown allows the devices to selfprotect against thermal overloads. Care must be exercised to observe the Safe Operating Area (SOA)
curve and proper heatsinking will ensure maximum
reliability.
♦ HALF AND FULL BRIDGE MOTOR DRIVERS
♦ AUDIO POWER AMPLIFIER
Stereo - 11.3W RMS per amplifier
Bridge - 22.6W RMS per two amplifiers
Two Bridges - 45.2W RMS per package
♦ 3 PHASE MOTOR DRIVER
3 Channels - 33.9W RMS per package
♦ IDEAL FOR SINGLE SUPPLY SYSTEMS
5V - Peripherals
12V - Automotive
28V - Avionic
♦ PACKAGING OPTIONS
20-Pin PSOP, JEDEC MO-166-AB (PA162DK)
The wide common mode input range includes the
negative rail, facilitating single supply applications.
This makes it possible to have a ground-based input
driving a single supply amplifier with ground acting
as the second or bottom supply of the amplifier.
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FIGURE 1. Equivalent schematic (one channel)
PA162U
http://www.cirrus.com
Copyright
© Cirrus Logic, Inc. 2008
(All Rights Reserved)
JUL 2008
APEX - PA162U REV A1
PA162
P r o d u c t I n n o v a t i o nF r o m
1. Characteristics and Specifications
NOTES:
1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken
at typical supply voltages and TC = 25°C).
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
5
40
V
SUPPLY VOLTAGE, total
OUTPUT CURRENT
SOA
POWER DISSIPATION, internal (1 amplifier)
15
W
POWER DISSIPATION, internal (2 amplifiers)
5
24
W
POWER DISSIPATION, internal (3 amplifiers)
5
36
W
POWER DISSIPATION, internal (4 amplifiers)5
45
W
INPUT VOLTAGE, differential
-Vs
+Vs
INPUT VOLTAGE, common mode
+Vs
-Vs-.5V
JUNCTION TEMPERATURE, max2
150
°C
TEMPERATURE, pin solder - 10 secs max.
220
°C
TEMP RANGE STORAGE
-55
150
°C
OPERATING TEMP RANGE, case2
-40
125
°C
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
power dissipation to achieve high MTTF.
SPECIFICATIONS (per amplifier)
Parameter
Test Conditions2,3
Min
Typ
Max
Units
1
15
mV
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
Full temp range
20
BIAS CURRENT, initial
µV/°C
100
COMMON MODE RANGE
Full temp range
-Vs
COMMON MODE REJECTION, DC
500
nA
+Vs
V
60
90
dB
POWER SUPPLY REJECTION
Full temp range
60
90
dB
CHANNEL SEPARATION
IOUT = 500mA, ƒ = 1kHz
50
68
dB
INPUT NOISE VOLTAGE
RS = 100Ω, ƒ = 1 to 100kHz
22
nV/√Hz
100
dB
GAIN
OPEN LOOP GAIN
VO = ±10V, RL = 2.0KΩ
89
GAIN BANDWIDTH PRODUCT
ƒ = 100kHz, CL = 100pF, RL = 2.0KΩ
0.9
PHASE MARGIN
Full temp range
65
°C
POWER BANDWIDTH
VO(P-P) = 28V
13.6
kHz
1.4
MHz
OUTPUT
CURRENT, peak
CURRENT, continuous
SLEW RATE
VOLTAGE SWING
Full temp range, IO = 100mA
1.5
A
1
A
1.0
1.4
V/µS
|Vs| -1.1
|Vs| -0.8
V
PA162U
PA162
P r o d u c t I n n o v a t i o nF r o m
Parameter
Test Conditions2,3
VOLTAGE SWING
Full temp range, IO = 1A
HARMONIC DISTORTION
AV = 1, RL = 50Ω,
VO = .5VRMS, ƒ = 1kHz
Min
Typ
Max
Units
|Vs| -1.8
|Vs| -1.4
V
.02
%
POWER SUPPLY
VOLTAGE, Vss4
5
30
40
V
CURRENT, quiescent +Vs (A/B)
8
10
mA
CURRENT, quiescent +Vs (C/D)
8
10
mA
CURRENT, quiescent total
16
20
mA
THERMAL
RESISTANCE, junction to case
DC, 1 amplifier
7.16
7.87
°C/W
5
4.69
5.16
°C/W
DC, 3 amplifiers5
3.08
3.39
°C/W
DC, 4 amplifiers
2.51
2.77
°C/W
AC, 1 amplifier
5.37
5.90
°C/W
AC, 2 amplifiers5
3.52
3.87
°C/W
AC, 3 amplifiers
5
2.31
2.54
°C/W
AC, 4 amplifiers5
1.89
2.07
°C/W
DC, 2 amplifiers
5
RESISTANCE, junction to air
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3. Unless otherwise noted, the following conditions apply: ±VS = ±15V, T C =25°C.
4. +VS and -Vs denote the positive and negative rail respectively. VSS denotes total rail-to-rail supply.
5. Rating applies when power dissipation is equal in each of the amplifiers. Power and thermal ratings
are based on two separate dual monolithic power op-amps on one integrated copper heatslug.
Amplifiers A and B are combined on one monolithic die while amplifiers C and D are on the other.
6. If -Vs is disconnected before +Vs, a diode between -Vs and ground is recommended to avoid damage.
7. Rating applies when the heatslug of the DK package is soldered to a minimum of 1 square inch foil
area of a printed circuit board.
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PACKAGE STYLE DK
FIGURE 2. External Connections.
PA162U
PA162
P r o d u c t I n n o v a t i o nF r o m
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TYPICAL APPLICATION
R1 and R2 set up Amplifier A as non-inverting. Amplifier B is set up as a unity gain inverter driven from the
output of Amplifier A. Note that Amplifier B inverts the
signals about the reference node, which is set at midsupply by R5 and R6. When the command input is
midrange, so is the output of Amplifier A. Since this is
also equivalent to the reference node voltage, the output of Amplifier B is the same resulting in 0V across
the motor. Inputs more positive than 5V result in motor
current flow from left to right (see Figure 3). Inputs less
than 5V drive the motor in the opposite direction.
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R3
R2
R4
R1
INPUT
0-10V
_
A
1/4 PA162
_
B
1/4 PA162
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+
+28V
R5
+
R6
FIGURE 3. Bi-directional speed control from a single
supply.
PA162U
PA162
P r o d u c t I n n o v a t i o nF r o m
TYPICAL APPLICATION (cont)
The amplifiers are especially well-suited for applications such as this. The extended common mode range
allows command inputs as low as 0V. The output swing
lets it drive within 2V of the supply at an output of 1A.
This means that a command input that ranges from 0
to 10V will drive a 24V motor from full scale CCW to full
scale CW at ±1A.
N
o
S
-Vs (pins 11, 15, 16 and 20) must be tied to the heatslug externally on the PCB. To ease metal routing on
the PCB, run a direct trace from the -Vs pin to the center heat slug.
PA162
Quad
The PA162 can be used in a three amplifier configuration for a three phase inverter or motor as shown in
Figure 4.
Using 3 amplifiers from PA162
as 3 phase motor driver.
FIGURE 4. 3 Phase Inverter
GENERAL
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heatsinking,
mounting, SOA interpretation, and specification interpretation. Visit www.cirrus.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.
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 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.
THERMAL CONSIDERATIONS
The PA162DK has a large exposed integrated copper heatslug to which the monolithic is directly attached. The solder
connection of the heatslug to a minimum of 1 square inch
foil area of the printed circuit board will result in thermal performance of 25°C/W junction to air rating of the PA162DK.
Solder connection to an area of 1 to 2 square inches of foil
is required for minimal power applications.
PA162U
OUTPUT CURRENT FROM +VS OR -VS, (A)
SAFE OPERATING AREA (SOA)
10
SOA
DC, TC = 25°C
DC, TC = 85°C
1
0.1
4 AMPLIFIERS LOADED
3 AMPLIFIERS LOADED
2 AMPLIFIERS LOADED
1 AMPLIFIER LOADED
1
10
50
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS - VO (V)
PA162
P r o d u c t I n n o v a t i o nF r o m
Where the PA162DK is used in higher power applications, it is necessary to use surface mount techniques of
heatsinking. 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 with through hole thermal vias. Other highly thermal conductive
substrate board materials are available for maximum heat sinking.
MOUNTING PRECAUTIONS
1. Always use a heat sink. Even unloaded the PA162DK
can dissipate up to .8 watts.
2. Avoid bending the leads. Such action can lead to internal damage.
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The Power Derating graph assumes that the power dissipation is equal in each of the amplifiers. Power and thermal ratings are based on two separate dual monolithic
power op amps on one integrated copper heat slug. Amps
A and B are combined on one monolithic die while amps
C and D are combined on the other. This multi chip configuration provides superior thermal performance by isolating each of the dual amplifiers. When loading either of
the dual amplifiers it is possible to achieve better thermal
performance by loading any combination of amplifiers (A
or B) + (C or D).
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Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
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Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
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CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
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PA162U