CIRRUS PA162_09

PA162
PA162
P r o d u c t II nnnnoovvaa t i o n FFr 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.
+Vs
I BIAS
MONITOR
-IN
+IN
OUT
THERMAL
PROTECT
-Vs
FIGURE 1. Equivalent schematic (one channel)
Copyright © Cirrus Logic, Inc. 2009
PA162U
(All Rights Reserved)
http://www.cirrus.com
JUL 2009
1
APEX - PA162UREVB
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
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
5
40
V
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
SUPPLY VOLTAGE, total
OUTPUT CURRENT
SOA
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
SPECIFICATIONS (per amplifier)
Parameter
Test Conditions2,3
Min
Typ
Max
1
15
Units
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
Full temp range
20
BIAS CURRENT, initial
COMMON MODE RANGE
100
Full temp range
COMMON MODE REJECTION, DC
-Vs
mV
µV/°C
500
+Vs
nA
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
PHASE MARGIN
Full temp range
65
°C
POWER BANDWIDTH
VO(P-P) = 28V
13.6
kHz
0.9
1.4
MHz
OUTPUT
CURRENT, peak
CURRENT, continuous
SLEW RATE
1.5
A
1
A
1.0
1.4
V/µS
VOLTAGE SWING
Full temp range, IO = 100mA
|Vs| -1.1
|Vs| -0.8
V
VOLTAGE SWING
Full temp range, IO = 1A
|Vs| -1.8
|Vs| -1.4
V
HARMONIC DISTORTION
AV = 1, RL = 50Ω,
VO = .5VRMS, ƒ = 1kHz
.02
%
2
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
Min
Typ
Max
Units
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
POWER SUPPLY
VOLTAGE, Vss4
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
DC, 2 amplifiers
5
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 amplifiers
5
1.89
2.07
25
RESISTANCE, junction to air7
°C/W
°C/W
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).
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
power dissipation to achieve high MTTF.
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.
1
20
A
-
+
+
B
-
NC
-IN(A)
+IN(A)
+IN(B)
-IN(B)
-IN(C)
+IN(C)
+IN(D)
-IN(D)
NC
-
C
+
+
D
-
10
11
-VS
OUT(A)
+VS(A/B)
OUT(B)
-VS
-VS
OUT(C)
+VS(C/D)
OUT(D)
-VS
20-pin PSOP
PACKAGE STYLE DK
FIGURE 2. External Connections.
PA162U
3
PA162
P r o d u c t I n n o v a t i o nF r o m
40
8
0
4
-40
-80
2
10
8
4
6
AVERAGE QUIESCENT CURRENT, IQ (mA)
0
PHASE MARGIN vs. OUTPUT LOAD CAPACITANCE
55
GAIN, A (dB)
PHASE MARGIN, Ф (°)
55
45
0
40
120
-40
80
CASE TEMPERATURE, TC (°C)
90
60
45
35
PULSE RESPONSE
10
40
100
20
110
0
120
-20
25
20
04
08
12
16
00
OUTPUT LOAD CAPACITANCE, CL (nF)
1
100
1K
10
FREQUENCY, ƒ (KHz)
130
10K
VOS
3
2
1
0
2
0
40
80
120
-40
CASE TEMPERATURE, TC (°C)
OUTPUT VOLTAGE SWING
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
OUTPUT CURRENT, IO (A)
PULSE RESPONSE
10
8
8
OUTPUT VOLTAGE, VO (V)
OUTPUT VOLTAGE, VO (V)
65
VOLTAGE GAIN & PHASE vs. FREQUENCY
65
+VS = +15V
AV = +1
VIN = 10Vp
6
4
2
0
-2
-VS = -15V
RL = 20Ω
fIN = 20kHz
-4
-6
-8
-10
AVERAGE OFFSET VOLTAGE, VOS (mV)
12
BIAS CURRENT
VOLTAGE DROP FROM SUPPLY, (V)
16
80
75
PHASE, Ф (°)
120
AVERAGE BIAS CURRENT, IB (mA)
20
CASE TEMPERATURE, TC (°C)
TOTAL SUPPLY VOLTAGE, VS (V)
QUIESCENT CURRENT
0
10
20
30 40
TIME, t (s)
50
60
70
+VS = +15V
AV = +1
VIN = 10Vp
6
4
2
0
-2
-4
-6
-VS = -15V
fIN = 1kHz
-8
-10
0
200 400 600 800 1000 1200 1400
TIME, t (s)
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.
R3
R2
R4
R1
INPUT
0-10V
_
A
1/4 PA162
+
M
+28V
_
B
1/4 PA162
R5
+
R6
FIGURE 3. Bi-directional speed control
from a single supply.
4
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.
-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.
The PA162 can be used in a three amplifier configuration
for a three phase inverter or motor as shown in Figure 4.
N
o
S
PA162
Quad
GENERAL
Using 3 amplifiers from PA162
as 3 phase motor driver.
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heatsinking, FIGURE 4. 3 Phase Inverter
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 Precision Power's complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits.
STABILITY CONSIDERATIONS
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.
OUTPUT CURRENT FROM +VS OR -VS, (A)
+
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)
–
C SN
output stages with a mismatch in gain and phase response for different polarities of
0.01µF
output current. It is difficult for the op amp manufacturer to optimize compensation
for all operating conditions. For applications with load current exceeding 300mA,
R SN
oscillation may appear. The oscillation may occur only with the output voltage swing
10Ω
at the negative or positive half cycle. Under most operating and load conditions
acceptable stability can be achieved by providing a series RC snubber network
connected from the output to ground (see Figure 5). The recommended component
values of the of the network are, RSN = 10Ω and CSN = 0.01µF. Please refer to Ap- FIGURE 5. R-C Snubber
plication Note 1 for further details.
10
DC, TC = 25°C
DC, TC = 85°C
1
0.1
PA162U
SOA
4 AMPLIFIERS LOADED
3 AMPLIFIERS LOADED
2 AMPLIFIERS LOADED
1 AMPLIFIER LOADED
1
10
50
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS - VO (V)
5
PA162
P r o d u c t I n n o v a t i o nF r o m
THERMAL CONSIDERATIONS
INTERNAL POWER DISSIPATION, P (W)
POWER DERATING
50
The PA162DK has a large exposed integrated copper heat(A
+B
slug to which the monolithic is directly attached. The solder
+C
+D
connection of the heatslug to a minimum of 1 square inch
)A
(
A
40
+B
MP
+C
LIF
foil area of the printed circuit board will result in thermal per)A
IE
MP
RS
LIF
formance of 25°C/W junction to air rating of the PA162DK.
LO
IER
30
AD
S
Solder connection to an area of 1 to 2 square inches of foil
LO
ED
(A+
A
D
B
is required for minimal power applications.
ED
) AM
PLI
FIE
Where the PA162DK is used in higher power applications, it
RS
20
LOA
(
A
)
DED
A
is necessary to use surface mount techniques of heatsinkMPLIF
IER L
O
A
ing. Surface mount techniques include the use of a surface
DED
10
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
0
125
25
75
100
0
50
materials are available for maximum heat sinking.
JUNCTION
TEMPERATURE,
T
(°C)
J
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).
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.
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
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
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does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
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