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I n n o v a o n o v a t i o PA76A Produc nn PA74, PA76,t iIPA74A, n F r o m From
Product
PA74/PA76 * PA74A/76A PA74/76 * PA74A/76A
Power Dual Operational Amplifiers
FEATURES
* LOWCOST * WIDECOMMONMODERANGE-- Includesnegativesupply * WIDESUPPLYVOLTAGERANGE Singlesupply:5Vto40V Splitsupplies:2.5Vto20V * HIGHEFFICIENCY--|Vs-2.2V|at2.5Atyp * HIGHOUTPUTCURRENT--3A * LOWDISTORTION
8-PINTO-3 PACKAGESTYLECE
R2 +28V 9K _ A + COMMAND INPUT 0/10V 1/2 PA74 R3 10K R4 10K _ +28V R5 10K R6 10K
APPLICATIONS
* HALF&FULLBRIDGEMOTORDRIVERS * AUDIOPOWERAMPLIFIER STEREO--30WRMSperchannel BRIDGE--60WRMSperpackage * IDEALFORSINGLESUPPLYSYSTEMS 5V--Peripherals,12V--Automotive 28V--Avionic
R1 5K
M
1/2 PA74
B +
FIGURE 1: BIDIRECTIONAL SPEED CONTROL FROM A SINGLE SUPPLY.
DESCRIPTION
The amplifier design consists of dual monolithic input and output 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 compensated for stability. The PA74 and PA76 dual amplifiers are designed with both monolithic and hybrid technologies providing a cost effective solution for applications requiring multiple amplifiers per board or bridge mode configurations. Both amplifiers are internally compensated but are not recommended for use as unity gain followers. This dual hybrid circuit utilizes a beryllia (BeO) substrate, thick film resistors, ceramic capacitors and monolithic amplifiers to maximize reliability and power handling capability, 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.
TYPICALAPPLICATION
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. The extended common mode range allows command inputs as 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.
EQUIVALENTSCHEMATIC ONE CHANNEL
+VS I BIAS MONITOR CURRENT GAIN
EXTERNALCONNECTIONS (TOp viEws)
PA74
-IN, A 4 3 +VS 2 OUT, A 1
PA76
+IN, A 3 -IN, A 4 +VS 2 OUT, B 1
A
-IN
+IN
THERMAL PROTECT
+IN, A
OUT
-
A
+ +
B
CURRENT GAIN
5 +IN, B -IN, B 6
B 8 OUT, B
5 OUT, A -VS 6
-
-VS
7 -VS
7 +IN, B
8 -IN, B
PA74-76U
http://www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2009 (All Rights Reserved)
MAY 2009 1 APEX - PA74-76UREVE
PA74/76 * PA74A/76A
ABSOLUTEMAXIMUMRATINGS
P r o d u c t I n n o v a t i o nF r o m
SUPPLY VOLTAGE, total OUTPUT CURRENT POWER DISSIPATION, internal (per amplifier) POWER DISSIPATION, internal (both amplifiers) INPUT VOLTAGE, differential INPUT VOLTAGE, common mode JUNCTION TEMPERATURE, max1 TEMPERATURE, pin solder-10 sec max TEMPERATURE RANGE, storage OPERATING TEMPERATURE RANGE, case PA74/76 TYP 1.5 20 100 70 90 70
5V to 40V SOA 36W 60W VS +VS, -VS-0.5V 150C 300C -65C to 150C -55C to 125C PA74A/PA76A TYP MAX .5 10 * * * * 7 250 *
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature BIAS CURRENT, initial COMMON MODE RANGE COMMON MODE REJECTION, DC POWER SUPPLY REJECTION CHANNEL SEPARATION INPUT NOISE VOLTAGE GAIN OPEN LOOP GAIN GAIN BANDWIDTH PRODUCT POWER BANDWIDTH OUTPUT CURRENT, peak SLEW RATE VOLTAGE SWING VOLTAGE SWING VOLTAGE SWING VOLTAGE SWING POWER SUPPLY VOLTAGE, VSS3 CURRENT, quiescent, total THERMAL RESISTANCE, junction to case DC, single amplifier DC, both amplifiers4 AC, single amplifier AC, both amplifiers4 RESISTANCE, junction to air TEMPERATURE RANGE, case TEST CONDITIONS2 MIN MAX 10 500 +VS-1.3 * * * * MIN UNITS mV V/C nA V dB dB dB
Full temperature range Full temperature range Full temperature range Full temperature range IOUT = 1A, F = 1kHz RS = 100, f = 1 to 100KHz Full temperature range AV = 40dB VO(P-P) = 28V -VS 60 60 50
89 0.9
100 1.4 13.6
* *
* * *
*
dB MHz kHz A V/s V V V V
Full temp. range, IO = 100mA Full temp. range, IO = 1A IO = 2.5A (PA74, 76) IO = 3.0A (PA74A, PA76A)
2.5 0.5 |VS| -1.1 |VS| -2.0 |VS| -3.5
1.4 |VS| -0.9 |VS| -1.7 |VS| -2.9
3 * * * * |VS| -4.0 40 40 *
* * * * |VS| -3.3 * * * *
30 18
V mA
Meets full range specifications
-25
3.2 1.9 2.4 1.4 30
3.5 2.1 2.6 1.6 85 -25
* * * * *
* * * * * 85
C/W C/W C/W C/W C/W C
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 = 25C. 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.
CAUTION
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 850C to avoid generating toxic fumes.
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PA74-76U
P r o d u c t I n n o v a t i o nF r o m
PA74/76 * PA74A/76A
NORMALIZED QUIESCENT CURRENT, IQ (X)
2.0 1.8 1.5 1.4 1.2 1.0 0.8 0.6
NORMALIZED QUIESCENT CURRENT, IQ (X)
VOLTAGE DROP FROM SUPPLY, VDROP (V)
NORMALIZED QUIESCENT CURRENT vs. CASE TEMPERATURE
NORMALIZED QUIESCENT CURRENT vs. SUPPLY VOTAGE
1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0 5 10 15 SUPPLY VOLTAGE, VS (V) 20
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5
OUTPUT VOLTAGE SWING
0.4 -80 -20 20 60 100 140 CASE TEMPERATURE, TC (C) 15
0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT CURRENT, IO (A) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 -80 -40 0 40 80 120 160 TEMPERATURE, (C)
15 OUTPUT VOLTAGE, VO (V) 10 5
10 5 +VS = +15V AV = +1 -5 VIN = 10Vp -V = -15V -10 R S= 10 L fIN = 20KHz -15 0 10 20 30 40 50 TIME, t (s) 80 120 0
60 70
+VS = +15V AV = +1 VIN = 10Vp -VS = -15V -10 RL = 10 f = 1KHz -15 IN 0 200 400 600 800 1.0K 1.2K 1.4K TIME, t (s) -5 80 60
0
NORMALIZED BIAS CURRENT, IB (X)
PULSE RESPONSE
PULSE RESPONSE
IB
OUTPUT VOLTAGE, VO (V)
NORMALIZED OFFSET VOLTAGE, VOS (X)
PHASE vs. FREQUENCY
VOLTAGE GAIN vs. FREQUENCY
8
VOS
PHASE, ()
160 200 240 280 1K
GAIN, A (dB)
40 20 0 -20
4
0
-4 -40 0 40 80 120 TEMPERATURE, (C)
10K 100K 1M FREQUENCY, f (Hz)
10M
-40 1K
10K 100K 1M FREQUENCY, f (Hz)
10M
PA74-76U
3
PA74/76 * PA74A/76A
GENERAL
P r o d u c t I n n o v a t i o nF r o m
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 Precision Power's complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits.
PARALLELCONFIGURATIONCONSIDERATIONS LOSSES
The PA74 and PA76 utilize a parallel configuration to achieve the desired current output requirements.The parallel 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.
STABILITYCONSIDERATIONS
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 opamp manufacturer to optimize compensation for all operating conditions.
SUPPLYCURRENT
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 5KHz 10KHz 15KHz Supply Current 18mA 20mA 32mA 50mA 75mA
SOA
OUTPUT CURRENT FROM +VS or -VS, (A) 10 TWO AMPLIFIERS LOADED DC, TC = 25C
ONE AMPLIFIER LOADED 1.0 DC, TC = 85C
SATURATIONOPERATION
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.
70 60 50 40 30 20 10 0 0 25 50 75 100 CASE TEMPERATURE, TC (C) 125 ONE AMPLIFIER LOADED
POWER DERATING
TWO AMPLIFIERS LOADED
0.1 1.0
10
100
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS - VO (V)
SAFEOPERATINGAREA(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.
THERMALCONSIDERATIONS
Thermal grease or a Apex Precision Power TW03 thermal washer, RCS = .1 to .2C/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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INTERNAL POWER DISSIPATION, P (W)
PA74-76U
P r o d u c t I n n o v a t i o nF r o m
PA74/76 * PA74A/76A
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 apex.support@cirrus.com. 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 information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent 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 LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. 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.
PA74-76U
5

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