CIRRUS PA12_09

PA12PA12
• PA12A
• PA12A
P r o d u c t IPA12A
Innnnoovvaa t i o n FFr roomm
PA12,
Power Operational Amplifier
FEATURES
• LOW THERMAL RESISTANCE — 1.4°C/W
• CURRENT FOLDOVER PROTECTION — NEW
• HIGH TEMPERATURE VERSION — PA12H
• EXCELLENT LINEARITY — Class A/B Output
• WIDE SUPPLY RANGE — ±10V to ±50V
• HIGH OUTPUT CURRENT — Up to ±15A Peak
8-pin TO-3
PACKAGE STYLE CE
APPLICATIONS
POWER RATING
• MOTOR, VALVE AND ACTUATOR CONTROL
• MAGNETIC DEFLECTION CIRCUITS UP TO 10A
• POWER TRANSDUCERS UP TO 100kHz
• TEMPERATURE CONTROL UP TO 360W
• PROGRAMMABLE POWER SUPPLIES UP TO 90V
• AUDIO AMPLIFIERS UP TO 120W RMS
DESCRIPTION
The PA12 is a state of the art high voltage, very high output
current operational amplifier designed to drive resistive, inductive and capacitive loads. For optimum linearity, especially at low
levels, the output stage is biased for class A/B operation using
a thermistor compensated base-emitter voltage multiplier circuit.
The safe operating area (SOA) can be observed for all operating
conditions by selection of user programmable current limiting
resistors. For continuous operation under load, a heatsink of
proper rating is recommended. The PA12 is not recommended
for gains below –3 (inverting) or +4 (non-inverting).
This hybrid integrated circuit utilizes thick film (cermet)
resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires 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.
EQUIVALENT SCHEMATIC
Not all vendors use the same method to rate the power
handling capability of a Power Op Amp. Apex Precision Power
rates the internal dissipation, which is consistent with rating
methods used by transistor manufacturers and gives conservative results. Rating delivered power is highly application
dependent and therefore can be misleading. For example, the
125W internal dissipation rating of the PA12 could be expressed
as an output rating of 250W for audio (sine wave) or as 440W
if using a single ended DC load. Please note that all vendors
rate maximum power using an infinite heatsink.
THERMAL STABILITY
Apex Precision Power has eliminated the tendency of class
A/B output stages toward thermal runaway and thus has vastly
increased amplifier reliability. This feature, not found in most
other Power Op Amps, was pioneered by Apex Precision
Power in 1981 using thermistors which assure a negative
temperature coefficient in the quiescent current. The reliability
benefits of this added circuitry far outweigh the slight increase
in component count.
EXTERNAL CONNECTIONS
RCL+
CL+
+VS
2
3
1
OUT
OUTPUT
+IN 4
TOP VIEW
3
–IN
Q2A
D1
5
Q2B
2
Q1
–VS
6
7
8
CL–
RCL-
F.O.
Q3
Q4
1
7
Q5
8
4
Q6A
A1
Q6B
5
C1
6
PA12U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − PA12UREVS
PA12 • PA12A
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
P r o d u c t I n n o v a t i o nF r o m
SUPPLY VOLTAGE, +Vs to –Vs
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder -10s
TEMPERATURE, junction1
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
PARAMETER
TEST CONDITIONS 2, 5
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. power
BIAS CURRENT, initial
BIAS CURRENT, vs. temperature
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
OFFSET CURRENT, vs. temperature
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE3
COMMON MODE REJECTION, DC
TC = 25°C
Full temperature range
TC = 25°C
TC = 25°C
TC = 25°C
Full temperature range
TC = 25°C
TC = 25°C
Full temperature range
TC = 25°C
TC = 25°C
Full temperature range
Full temp. range, VCM = ±VS –6V
GAIN
OPEN LOOP GAIN at 10Hz
OPEN LOOP GAIN at 10Hz
GAIN BANDWIDTH PRODUCT @ 1MHz
POWER BANDWIDTH
PHASE MARGIN, AV = +4
TC = 25°C, 1KΩ load
Full temp. range, 8Ω load
TC = 25°C, 8Ω load
TC = 25°C, 8Ω load
Full temp. range, 8Ω load
OUTPUT
VOLTAGE SWING3
VOLTAGE SWING3
VOLTAGE SWING3
CURRENT, peak
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD
CAPACITIVE LOAD
TC = 25°C, PA12 = 10A, PA12A = 15A
TC = 25°C, IO = 5A
Full temp. range, IO = 80mA
TC = 25°C
TC = 25°C, 2V step
TC = 25°C
Full temperature range, AV = 4
Full temperature range, AV > 10
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
Full temperature range
TC = 25°C
THERMAL
RESISTANCE, AC, junction to case4
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
TC = –55 to +125°C, F > 60Hz
TC = –55 to +125°C
TC = –55 to +125°C
Meets full range specification
PA12/PA12A
100V
15A
125W
±37V
±VS
300°C
200°C
–65 to +150°C
–55 to +125°C
MIN
PA12
TYP
PA12A
MAX
MIN TYP
±VS –5
74
±2
±10
±30
±20
±12
±50
±10
±12
±50
200
3
±VS –3
100
±6
±65
±200
±30
±500
±30
*
*
96
13
±VS –6
±VS –5
±VS–5
10
2.5
±10
–25
MAX
UNITS
±1
±4
*
±40
*
*
*
10
20
*
*
*
±5
±20
*
*
*
*
*
mV
µV/°C
µV/V
µV/W
nA
pA/°C
pA/V
nA
pA/°C
MΩ
pF
V
dB
*
*
*
*
*
dB
dB
MHz
kHz
°
*
*
*
15
*
*
*
1.5
*
SOA
*
V
V
V
A
µs
V/µs
nF
±40
25
±45
*
50
V
mA
.8
1.25
30
.9
*
*
1.4
*
*
*
+85
–55
+125
110
108
4
20
20
2
4
*
*
*
*
±50
*
°C/W
°C/W
°C/W
°C
NOTES: * The specification of PA12A is identical to the specification for PA12 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 tests is ±40, 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. Full temperature range specifications are guaranteed but not 100% tested.
CAUTION
2
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.
PA12U
PA12 • PA12A
POWER DERATING
80
60
20
0
1.3
1.0
.7
SMALL SIGNAL RESPONSE
80
–60
PHASE, Ф (°)
–30
40
20
–150
–20
1
–210
100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
10
COMMON MODE REJECTION
100
80
60
40
20
1
0
3
1
10K .1M
100 1K
FREQUENCY, F (Hz)
10
0
-2
-4
-6
W
0m
.003
100
PA12U
2
4
6
8
TIME, t (µs)
10
W
=4
PO
=
PO
300
W
20
1.2
1.0
.8
TC
C
= –25°
°C
T C = 25
°C
T C = 85
TC
= 125°C
.6
1
1K
3K 10K 30K
FREQUENCY, F (Hz)
32
.1M
.4
40
| +VS | – | –VS | = 80V
22
15
| +VS | + | –VS | = 30V
10
6.8
4.6
10K
12
1.4
PO
10
46
QUIESCENT CURRENT
AV =10
VS = ±37V
RL = 4Ω
=
.01
0
1.6
.3
.03
VIN = ±5V, tr = 100ns
2
1M
| +VS | + | –VS | = 100V
68
100
50
60
70
80
90
TOTAL SUPPLY VOLTAGE, VS (V)
20K 30K
50K 70K .1M
FREQUENCY, F (Hz)
INPUT NOISE
100
4
HARMONIC DISTORTION
.1
0
–50 –25 0
25 50 75 100 125
CASE TEMPERATURE, TC (°C)
100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
PULSE RESPONSE
6
-8
1
10
8
120
VO = –24
V
POWER RESPONSE
–120
–180
=0
VO =
24V
VO = 0
5.0
2.5
O
100
–90
0
V
RCL = .18Ω ,RFO = 0
7.5
PHASE RESPONSE
0
100
60
10.0
.4
25 50 75 100 125
–50 –25 0
CASE TEMPERATURE, TC (°C)
20 40 60 80 100 120 140
CASE TEMPERATURE, TC (°C)
OUTPUT VOLTAGE, VO (V)
OPEN LOOP GAIN, A (dB)
COMMON MODE REJECTION, CMR (dB)
1.6
RCL = .06Ω ,RFO = ∞
12.5
INPUT NOISE VOLTAGE, VN (nV/√Hz)
0
120
DISTORTION, (%)
PA12A
1.9
15.0
VOLTAGE DROP FROM SUPPLY (V)
PA12
40
2.2
CURRENT LIMIT, ILIM (A)
100
CURRENT LIMIT
17.5
OUTPUT VOLTAGE, VO (VP-P)
120
BIAS CURRENT
2.5
NORMALIZED BIAS CURRENT, IB (X)
140
NORMALIZED, IQ (X)
INTERNAL POWER DISSIPATION, P (W)
P r o d u c t I n n o v a t i o nF r o m
70
50
40
30
20
10
10
1K
100
10K
FREQUENCY, F (Hz)
.1M
OUTPUT VOLTAGE SWING
6
5
–VO
4
3
+VO
2
1
0
3
6
9
12
OUTPUT CURRENT, IO (A)
15
3
PA12 • PA12A
P r o d u c t I n n o v a t i o nF r o m
GENERAL
Please read Application Note 1 "General Operating Considerations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.Cirrus.com for design tools that help
automate tasks such as calculations for stability, internal power
dissipation, current limit; heat sink selection; Apex Precision
Power’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
SAFE OPERATING AREA (SOA)
SOA
15
2.0
ER
MA
L
T
C
T
C
5°C
=1
25°
e
tat
ys
C
ad
.6
5°C
=8
ste
T
C
1.0
=2
ms
4.0
3.0
TH
0.5
6.0
t=
10
s
1m
s
t=
5m
t=
OUTPUT CURRENT FROM +VS OR -VS (A)
The output stage of most power amplifiers has three distinct
limitations:
1. The current handling capability of the transistor geometry
and the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
3. The junction temperature of the output transistors.
.4
SECOND BREAKDOWN
.3
10
20
30
40 50
70
100
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS - VO (V)
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. However, the following guidelines may save extensive
analytical efforts.
1. Capacitive and dynamic* inductive loads up to the following
maximum are safe with the current limits set as specified.
CAPACITIVE LOAD
INDUCTIVE LOAD
±VS
ILIM = 5A
ILIM = 10A ILIM = 5A
ILIM = 10A
50V
200µF
125µF
5mH
2.0mH
40V
500µF
350µF
15mH
3.0mH
35V
2.0mF
850µF
50mH
5.0mH
30V
7.0mF
2.5mF
150mH
10mH
25V
25mF
10mF
500mH
20mH
20V
60mF
20mF
1,000mH
30mH
15V
150mF
60mF
2,500mH
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 = 15A or 25V below the supply rail with ILIM
= 5A while the amplifier is current limiting, the inductor must
be capacitively coupled or the current limit must be lowered
to meet SOA criteria.
2. The amplifier can handle any EMF generating or reactive
4
load and short circuits to the supply rail or common if the
current limits are set as follows at TC = 25°C:
SHORT TO ±VS
SHORT TO
±VS
C, L, OR EMF LOAD
COMMON
50V
.30A
2.4A
40V
.58A
2.9A
35V
.87A
3.7A
30V
1.5A
4.1A
25V
2.4A
4.9A
20V
2.9A
6.3A
15V
4.2A
8.0A
These simplified limits may be exceeded with further analysis
using the operating conditions for a specific application.
CURRENT LIMITING
Refer to Application Note 9, "Current Limiting", for details of
both fixed and foldover current limit operation. Visit the Apex
Precision Power web site at www.Cirrus.com for a copy of the
Power Design spreadsheet (Excel) which plots current limits vs.
steady state SOA. Beware that current limit should be thought
of as a +/–20% function initially and varies about 2:1 over the
range of –55°C to 125°C.
For fixed current limit, leave pin 7 open and use equations
1 and 2.
RCL = 0.65/LCL
(1)
ICL = 0.65/RCL
(2)
Where:
ICL is the current limit in amperes.
RCL is the current limit resistor in ohms.
For certain applications, foldover current limit adds a slope
to the current limit which allows more power to be delivered
to the load without violating the SOA. For maximum foldover
slope, ground pin 7 and use equations 3 and 4.
0.65 + (Vo * 0.014)
ICL =
(3)
RCL
0.65 + (Vo * 0.014)
(4)
RCL =
ICL
Where:
Vo is the output voltage in volts.
Most designers start with either equation 1 to set RCL for the
desired current at 0v out, or with equation 4 to set RCL at the
maximum output voltage. Equation 3 should then be used to
plot the resulting foldover limits on the SOA graph. If equation 3 results in a negative current limit, foldover slope must
be reduced. This can happen when the output voltage is the
opposite polarity of the supply conducting the current.
In applications where a reduced foldover slope is desired,
this can be achieved by adding a resistor (RFO) between pin
7 and ground. Use equations 4 and 5 with this new resistor
in the circuit.
Vo * 0.14
0.65 +
10.14 + RFO
ICL =
(5)
RCL
Vo * 0.14
0.65 +
10.14 + RFO
RCL =
(6)
ICL
Where:
RFO is in K ohms.
PA12U
P r o d u c t I n n o v a t i o nF r o m
PA12 • PA12A
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
SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE
CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES,
BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL
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Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc.
All other brand and product names in this document may be trademarks or service marks of their respective owners.
PA12U
5