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P r o d u c t In n o v a t i nnova PA05, IPA05Ao n FFr roomm
PA05 * PA05A PA05 * PA05A
Power Operational Amplifier
FEATURES
* HIGHINTERNALDISSIPATION--250WATTS * HIGHVOLTAGE,HIGHCURRENT--100V,30A * HIGHSLEWRATE--100V/S * 4WIRECURRENTLIMITSENSING * LOWDISTORTION * EXTERNALSHUTDOWNCONTROL * OPTIONALBOOSTVOLTAGEINPUTS * EVALUATIONKIT--SEEEK09
12-PINPOWERDIP PACKAGESTYLECR
The JEDEC MO-127 12-pin Power DipTM package (see Package Outlines) is hermetically sealed and isolated from the internal circuits. The use of compressible thermal washers and/or improper mounting torque will void the product warranty. Please see "General Operating Considerations" .
APPLICATIONS
* LINEARANDROTARYMOTORDRIVES *sonartransducerdriver * YOKE/MAGNETICFIELDEXCITATION * PROGRAMMABLEPOWERSUPPLIESTO45V * AUDIOUPTO500W
TYPICAL APPLICATION
The high power bandwidth of the PA05 allows driving sonar transducers via a resonant circuit including the transducer and a matching transformer. The load circuit appears resistive to the PA05. Control logic turns off the amplifier's output during shutdown.
Rf
DESCRIPTION
The PA05 is a high voltage MOSFET power operational amplifier that extends the performance limits of power amplifiers in slew rate and power bandwidth, while maintaining high current and power dissipation ratings. The PA05 is a highly flexible amplifier. The shutdown control feature allows the output stage to be turned off for standby operation or load protection during fault conditions. Boost voltage inputs allow the small signal portion of the amplifier to operate at a higher voltage than the high current output stage. The amplifier is then biased to achieve close linear swings to the supply rails at high currents for extra efficient operation. External compensation tailors slew rate and bandwidth performance to user needs. A four wire sense technique allows precision current limiting without the need to consider internal or external milliohm parasitic resistance in the output line. The output stage is protected by thermal limiting circuits above junction temperatures of 175C.
CONTROL LOGIC ULTRASONIC DRIVE Ri 1 2 12
PA05
11 10
7 R CL
TUNED TRANSFORMER
EXTERNAL CONNECTIONS
-INPUT +INPUT COMP R CC C COMP -V BOOST -SUPPLY
1 2 3 4 5 6 TOP VIEW 12 11 10 9 8 7
EQUIVALENTSCHEMATIC
SHUTDOWN 12 9 +VBOOST Q1 Q12 Q13 4 D1 +Vs 8
SHUTDOWN CURRENT LIMIT CURRENT LIMIT
Q8 Q4 COMP 3 D6 D9 Q10 Q22 Q25 BIAS D27 D31
Q33
Q5 D5 Q14 Q18 OUT 7 ILIM 11 10 ILIM Q21 Q29
* +SUPPLY
OUTPUT
+V BOOST
*
Q16 -IN 1 D19 +IN 2
Q17
Q24
D20
PHASE COMPENSATION
Gain CC RC 1 470pF 120 >3 220pF 120 10 82pF 120 CC RATED FOR FULL SUPPLY VOLTAGE *See BOOST OPERATION paragraph.
Q30 -VBOOST 5
D4 6 -Vs
PA05U
http://www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2009 (All Rights Reserved)
MAY 2009 1 APEX - PA05UREVJ
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PA05 * PA05A
ABSOLUTEMAXIMUMRATINGS
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 BOOST VOLTAGE OUTPUT CURRENT, continuous within SOA POWER DISSIPATION, internal INPUT VOLTAGE, differential INPUT VOLTAGE, common mode TEMPERATURE, pin solder - 10s TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case TEST CONDITIONS 1 MIN PA05 TYP 5 20 10 30 10 .01 10 1011 13 100 10 102 3 400 60 VS-9.5 VS-8.7 VS-5.8 VS-5.0 30 2.5 80 100 2.2 5 2 15 45 46 90 46 .3 .4 12 50 56 120 56 .4 .5 85 * * * * * MAX 10 50 30 50 50 * * MIN
100V SUPPLY VOLTAGE +20V 30A 250W 20V VB 300C 175C -65 to +150C -55 to +125C PA05A TYP 2 10 * 10 5 * 5 * * * * * * * * * * * * * * * * * * * * * * * * * * * * MAX 5 30 * 20 20 UNITS mV V/C V/V V/W pA pA/V pA pF V dB Vrms dB MHz kHz V V A s V/s nF V mA mA mA C/W C/W C/W C
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature OFFSET VOLTAGE, vs. supply OFFSET VOLTAGE, vs. power BIAS CURRENT, initial BIAS CURRENT, vs. supply OFFSET CURRENT, initial INPUT IMPEDANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE COMMON MODE REJECTION, DC INPUT NOISE GAIN OPEN LOOP, @ 15Hz GAIN BANDWIDTH PRODUCT POWER BANDWIDTH PHASE MARGIN OUTPUT VOLTAGE SWING VOLTAGE SWING CURRENT, peak SETTLING TIME to .1% SLEW RATE CAPACITIVE LOAD RESISTANCE POWER SUPPLY VOLTAGE CURRENT, quiescent, boost supply CURRENT, quiescent, total CURRENT, quiescent, total, shutdown THERMAL RESISTANCE, AC, junction to case3 RESISTANCE, DC, junction to case RESISTANCE, junction to air4 TEMPERATURE RANGE, case
Full temperature range Full temperature range
Full temperature range Full temp. range, VCM = 20V 100KHz BW, RS = 1K Full temperature range, CC = 82pF RL = 10 RL = 4, VO = 80VP-P, AV = -10 CC = 82pF, RC = 120 Full temperature range, CC = 470pF IO = 20A VBOOST = Vs + 5V, IO = 30A AV = +1, 10V step, RL = 4 AV = -10, CC = 82pF, RC = 120 Full temperature range, AV = +1 IO = 0, No load, 2MHz IO = 1A, 2MHz Full temperature range
VB-8 90
94
*
*
Full temperature range, F>60Hz Full temperature range, F<60Hz Full temperature range Meets full range specification
-25
NOTES: * The specification of PA05A is identical to the specification for PA05 in applicable column to the left. 1. Unless otherwise noted: TC = 25C, CC = 470pF, RC = 120 ohms. DC input specifications are value given. Power supply voltage is typical rating. VBOOST = VS. 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. For guidance, refer to the heatsink data sheet. 3. Rating applies if the output current alternates between both output transistors at a rate faster than 60 Hz. 4. The PA05 must be used with a heatsink or the quiescent power may drive the unit to junction temperatures higher than 150C.
CAUTION
The PA05 is constructed from MOSFET transistors. ESD handling procedures must be observed. 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.
2
PA05U
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P r o d u c t I n n o v a t i o nF r o m
PA05 * PA05A
POWER SUPPLY REJECTION
100
SLEW RATE SR (V/S)
200 150 100 50 0
POWER SUPPLY REJECTION, PSR (dB)
INTERNAL POWER DISSIPATION, P (W)
250
POWER DERATING
100 80 60 40 20
SLEW RATE
s. COMP
80
60
40
0
25 50 75 100 125 150 CASE TEMPERATURE, TC (C)
0 10
100
1K 10K 100K 1M FREQUENCY F (Hz)
10M
20 100 200 300 400 500 EXT. COMPENSATION CAPACITOR CC (pF)
OPEN LOOP GAIN, A (dB)
80 60 CC = 220pf 40 CC = 470pf 20 0 10
RL = 8 RC = 120
CC = 82pf -45 CC = 220pf -90 -135 -180 -225 10 CC = 470pf CC = 470pf
PHASE, ()
CC = 82pf
VOLTAGE DROP FROM SUPPLY, VS -VO (V)
100
SMALL SIGNAL RESPONSE
0
PHASE RESPONSE
12 10 8 6 4
OUTPUT VOLTAGE SWING
CC = 220pf CC = 82pf
V BOO
ST
= VS
RL = 8 RC = 120 100 1K 10K 100K 1M FREQUENCY, F (Hz) 10M
V
2 0
ST BOO
= VS
+ 5V
100
1K 10K 100K 1M FREQUENCY, F (Hz)
10M
5 10 15 20 25 OUTPUT CURRENT, IO (A)
30
COMMON MODE REJECTION
COMMON MODE REJECTION, CMR (dB)
100
AV = +1
CC = 470pF
NORMALIZED CURRENT LIMIT, (%)
7.5
PULSE RESPONSE
130 120 110 100 90 80 70
CURRENT LIMIT
OUTPUT VOLTAGE, VO (V)
80 60 40 20 0 10
5 2.5 0
-2.5 -5
10K 100K 100 1K FREQUENCY, F (Hz)
1M
-7.5
0
5
20 10 15 TIME, t (s)
25
30
60 25 50 -50 -25 0 75 100 125 CASE TEMPERATURE, TC (C)
NORMALIZED QUIESCENT CURRENT, IQ (X)
.2 .1
HARMONIC DISTORTION
AV = 10 RL = 2 CC = 82pF, RC = 120 VS = 31V
QUIESCENT CURRENT
1.2 100
POWER RESPONSE
OUTPUT VOLTAGE, VO (VP-P)
60 40
DISTORTION, THD (%)
P
.05 .02 .01
=3
00
W
1.1
= CC
O
= CC
82 pF
20
22 0p
= CC
1.0
F
PO = 1W
47
10 6 4 2 40K
0p F
.005 .002 .001 30 100
PO
=
20
0W
.9
3K 10K 300 1K FREQUENCY, f (Hz)
30K
.8 20
100 40 60 80 TOTAL SUPPLY VOLTAGE, VS (V)
1M .4M 100K FREQUENCY, F (Hz)
4M
PA05U
3
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PA05 * PA05A
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, 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. The two current limit sense lines are to be connected directly across the current limit sense resistor. For the current limit to work correctly,pin 11 must be connected to the amplifier output side and pin 10 connected to the load side of the current limit resistor, RCL, as shown in Figure 1. This connection will bypass any parasitic resistances, RP formed by sockets and solder joints as well as internal amplifier losses. The current limiting resistor may not be placed anywhere in the output circuit except where shown in Figure 1. If current limiting is not used, pins 10 and 11 must be tied to pin 7. The value of the current limit resistor can be calculated as follows:
Rf
10
CL
The output stage thermal protection circuit engages when junction temperatures reach approximately 175C. If the condition remains that caused the shutdown, the amplifier may oscillate in and out of shutdown, creating high peak power stresses reducing the reliability of the device.
SHUTDOWNOPERATION
To disable the output stage, pin 12 is connected to ground via relay contacts or via an electronic switch. The switching device must be capable of sinking 2mA to complete shutdown and capable of standing off the supply voltage +VS. See Figure 2 for suggested circuits.
-LOGIC K1
12 SHUTDOWN
CURRENT LIMIT
A
12 SHUTDOWN -LOGIC
Q1 470
Ri INPUT
B
11
CL
1
2 PA05
7
RP
RCL RL
FIGURE 2. SHUTDOWN OPERATION
ILIMIT = .7/RCL
FIGURE 1. CURRENT LIMIT
SAFEOPERATINGAREA(SOA)
The MOSFET output stage of this power operational amplifier has two distinct limitations: 1. The current handling capability of the MOSFET geometry and the wire bonds. 2. The junction temperature of the output MOSFETs. NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used. SOA
30
From an internal circuitry standpoint, shutdown is just a special case of current limit where the allowed output current is zero. As with current limit, however, a small current does flow in the output during shutdown. A load impedance of 100 ohms or less is required to insure the output transistors are turned off. Note that even though the output transistors are off the output pin is not open circuited because of the shutdown operating current.
BOOSTOPERATION
With the VBOOST feature, the small signal stages of the amplifier are operated at higher supply voltages than the amplifier's high current output stage. +VBOOST (pin 9), and -VBOOST (pin 5) are connected to the small signal circuitry of the amplifier. +VS (pin 8) and -VS (pin 6) are connected to the high current output stage. An additional 5V on the VBOOST pins is sufficient to allow the small signal stages to drive the output transistors into saturation and improve the output voltage swing for extra efficient operation when required. When close swings to the supply rails is not required the +VBOOST and +VS pins must be strapped together as well as the -VBOOST and -VS pins.The boost voltage pins must not be at a voltage lower than the VS pins.
t=
OUTPUT CURRENT (A)
15 12 9
20
D C
D C
D C
0m
s
= TC
= TC
25 C
85
6 3 1.5 1.2 .9 .6
C
= TC 5 12 C
COMPENSATION
The external compensation components CC and RC are connected to pins 3 and 4. Unity gain stability can be achieved at any compensation capacitance greater than 470 pF with at least 60 degrees of phase margin. At higher gains, more phase shift can be tolerated in most designs and the compensation capacitance can accordingly be reduced, resulting in higher bandwidth and slew rate. Use the typical operating curves as a guide to select CC and RC for the application.
.3
1
2 3 45 10 20 30 40 50 100 SUPPLY TO OUTPUT DIFFERENTIAL (V)
4
PA05U
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P r o d u c t I n n o v a t i o nF r o m
PA05 * PA05A
ContACting CiRRUs LogiC sUPPoRt
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PA05U
5
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