PA05 • PA05A
PA05U 1
PA05, PA05A
The JEDEC MO-127 12-pin Power Dip™ 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”.
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 amplier's output during
shutdown.
EXTERNAL CONNECTIONS
PHASE COMPENSATION
Gain CC RC
1 470pF 120Ω
>3 220pF 120Ω
≥10 82pF 120Ω
CC RATED FOR FULL SUPPLY VOLTAGE
*See BOOST OPERATION paragraph.
FEATURES
• HIGH INTERNAL DISSIPATION — 250 WATTS
• HIGH VOLTAGE, HIGH CURRENT — 100V, 30A
• HIGH SLEW RATE — 100V/µS
• 4 WIRE CURRENT LIMIT SENSING
• LOW DISTORTION
• EXTERNAL SHUTDOWN CONTROL
• OPTIONAL BOOST VOLTAGE INPUTS
• EVALUATION KIT — SEE EK09
APPLICATIONS
• LINEAR AND ROTARY MOTOR DRIVES
• SONAR TRANSDUCER DRIVER
• YOKE/MAGNETIC FIELD EXCITATION
• PROGRAMMABLE POWER SUPPLIES TO ±45V
• AUDIO UP TO 500W
DESCRIPTION
The PA05 is a high voltage MOSFET power operational
amplier that extends the performance limits of power ampli-
ers in slew rate and power bandwidth, while maintaining high
current and power dissipation ratings.
The PA05 is a highly exible amplier. 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 amplier to
operate at a higher voltage than the high current output stage.
The amplier 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 per-
formance 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 175°C.
EQUIVALENT SCHEMATIC
12
9
56
8
10
SHUTDOWN
+VBOOST
–IN
–VBOOST
+IN
+Vs
ILIM
ILIM
OUT
–Vs
BIAS
7
4
3
COMP
2
1
11
Q12 Q13
Q1
Q8
Q4
Q5
Q10
Q16 Q17 Q22
Q14 Q18
Q24
Q21
Q25
Q29
Q30
Q33
D1
D6
D9
D5
D19 D20
D27
D31
D4
CONTROL
LOGIC
ULTRA-
SONIC
DRIVE
R
f
R
i
112
2
10
11
R
CL
TUNED
TRANSFORMER
PA05 7
TOP
VIEW
–INPUT
+INPUT
SHUTDOWN
CURRENT LIMIT
CURRENT LIMIT
C
C
R
C
1
2
3
4
5
6
12
11
10
9
8
7
TOP
VIEW
COMP
–V
BOOST
–SUPPLY
+V
BOOST
+SUPPLY
OUTPUT
*
*
COMP
12-PIN POWER DIP
PACKAGE STYLE CR
Power Operational Amplifier
PA05 • PA05A
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
www.apexanalog.com SEP 2012
PA05U REVL
PA05 • PA05A
2 PA05U
ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS 100V
BOOST VOLTAGE SUPPLY VOLTAGE +20V
OUTPUT CURRENT, continuous within SOA 30A
POWER DISSIPATION, internal 250W
INPUT VOLTAGE, differential ±20V
INPUT VOLTAGE, common mode ±VB
TEMPERATURE, pin solder - 10s 350°C
TEMPERATURE, junction2 175°C
TEMPERATURE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C
SPECIFICATIONS
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 850°C to avoid generating toxic fumes.
CAUTION
NOTES: * The specication of PA05A is identical to the specication for PA05 in applicable column to the left.
1. Unless otherwise noted: TC = 25°C, CC = 470pF, RC = 120 ohms. DC input specications are ± value given. Power supply volt-
age 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 150°C.
PA05 PA05A
PARAMETER TEST CONDITIONS 1 MIN TYP MAX MIN TYP MAX UNITS
INPUT
OFFSET VOLTAGE, initial 5 10 2 5 mV
OFFSET VOLTAGE, vs. temperature Full temperature range 20 50 10 30 µV/°C
OFFSET VOLTAGE, vs. supply 10 30 * * µV/V
OFFSET VOLTAGE, vs. power Full temperature range 30 10 µV/W
BIAS CURRENT, initial 10 50 5 20 pA
BIAS CURRENT, vs. supply .01 * pA/V
OFFSET CURRENT, initial 10 50 5 20 pA
INPUT IMPEDANCE, DC 1011 * Ω
INPUT CAPACITANCE 13 * pF
COMMON MODE VOLTAGE RANGE Full temperature range ±VB–8 * V
COMMON MODE REJECTION, DC Full temp. range, VCM = ±20V 90 100 * * dB
INPUT NOISE 100KHz BW, RS = 1KΩ 10 * µVrms
GAIN
OPEN LOOP, @ 15Hz Full temperature range, CC = 82pF 94 102 * * dB
GAIN BANDWIDTH PRODUCT RL = 10Ω 3 * MHz
POWER BANDWIDTH RL = 4Ω, VO = 80VP-P
, AV = –10 400 * kHz
CC = 82pF, RC = 120Ω
PHASE MARGIN Full temperature range, CC = 470pF 60 * °
OUTPUT
VOLTAGE SWING IO = 20A ±VS–9.5 ±VS–8.7 * * V
VOLTAGE SWING VBOOST = Vs + 5V, IO = 30A ±VS–5.8 ±VS–5.0 * * V
CURRENT, peak 30 * A
SETTLING TIME to .1% AV = +1, 10V step, RL = 4Ω 2.5 * µs
SLEW RATE AV = –10, CC = 82pF, RC = 120Ω 80 100 * V/µs
CAPACITIVE LOAD Full temperature range, AV = +1 2.2 * nF
RESISTANCE IO = 0, No load, 2MHz 5 * Ω
IO = 1A, 2MHz 2 * Ω
POWER SUPPLY
VOLTAGE Full temperature range ±15 ±45 ±50 * * * V
CURRENT, quiescent, boost supply 46 56 * * mA
CURRENT, quiescent, total 90 120 * * mA
CURRENT, quiescent, total, shutdown 46 56 * * mA
THERMAL
RESISTANCE, AC, junction to case3 Full temperature range, F>60Hz .3 .4 * * °C/W
RESISTANCE, DC, junction to case Full temperature range, F<60Hz .4 .5 * * °C/W
RESISTANCE, junction to air4 Full temperature range 12 * °C/W
TEMPERATURE RANGE, case Meets full range specication –25 85 * * °C
PA05 • PA05A
PA05U 3
0 25 50 75 100 125 150
CASE TEMPERATURE, T
C
(°C)
0
100
200
POWER DERATING
INTERNAL POWER DISSIPATION, P (W)
100 1K 10M
FREQUENCY F (Hz)
0
POWER SUPPLY REJECTION
POWER SUPPLY REJECTION, PSR (dB)
–50 0 75 125
CASE TEMPERATURE, T
C
(°C)
NORMALIZED CURRENT LIMIT, (%)
100 10M
FREQUENCY, F (Hz)
0
20
60
100
SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A (dB)
40
80
FREQUENCY, F (Hz)
–225
PHASE RESPONSE
0 5 20 30
2
VOLTAGE DROP FROM SUPPLY, V
S
–V
O
(V)
30 300 30K
FREQUENCY, f (Hz)
.001
.02
.2
HARMONIC DISTORTION
DISTORTION, THD (%)
.002
.01
.1
20 100
TOTAL SUPPLY VOLTAGE, V
S
(V)
.8
.9
1.2
QUIESCENT CURRENT
NORMALIZED QUIESCENT CURRENT, I
Q
(X)
1.0
1.1
40K .4M 4M
FREQUENCY, F (Hz)
2
POWER RESPONSE
OUTPUT VOLTAGE, V
O
(V
P-P
)
10
FREQUENCY, F (Hz)
0
COMMON MODE REJECTION
COMMON MODE REJECTION, CMR (dB)
60
80
100
1M100 1K 0 10 15
TIME, t (µs)
–5
0
PULSE RESPONSE
OUTPUT VOLTAGE, V
O
(V)
305 20
100 1K 3K 10K
25
CURRENT LIMIT
50
60
70
10 10K 100K 1M
150
250
OUTPUT VOLTAGE SWING
15
40 60 80
–7.5
10 1K 10K 100K 1M
20
40
60
80
100
PHASE, Ф (°)
100 10M10 1K 10K 100K 1M
–180
–135
–90
–45
0
4
6
8
10
12
OUTPUT CURRENT, I
O
(A)
10K 100K
–2.5
2.5
5
7.5
A
V
= +1
–25 25 100
80
90
100
110
120
130
.005
.05
A
V
= 10
R
L
= 2Ω
C
C
= 82pF, R
C
= 120Ω
V
S
= 31V
C
C
= 470pF
P
O
= 200W
P
O
= 1W
P
O
= 300W
40
20
50
R
L
= 8Ω
R
C
= 120Ω
C
C
= 82pf
C
C
= 220pf
C
C
= 470pf
C
C
= 470pf
C
C
= 220pf
C
C
= 82pf
4
6
10
20
40
60
100
C
C
= 82pF
CC = 470pF
C
C
= 220pF
V
BOOST
= V
S
V
BOOST
= V
S
+ 5V
10 25
100K 1M
20
60
40
EXT. COMPENSATION CAPACITOR C
C
(pF)
100 200 300 400 500
80
100
SLEW RATE vs. COMP
SLEW RATE SR (V/µS)
C
C
= 82pf
C
C
= 220pf
C
C
= 470pf
R
L
= 8Ω
R
C
= 120Ω
PA05 • PA05A
4 PA05U
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specication
interpretation. Visit www.apexanalog.com for design tools that
help automate tasks such as calculations for stability, internal
power dissipation, current limit; heat sink selection; Apex Mi-
crotechnologys complete Application Notes library; Technical
Seminar Workbook; and Evaluation Kits.
CURRENT LIMIT
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 amplier 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 amplier 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:
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
er 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 y-
back. However, for protection against sustained, high energy
yback, external fast-recovery diodes should be used.
The output stage thermal protection circuit engages when
junction temperatures reach approximately 175C. If the condition
remains that caused the shutdown, the amplier may oscillate
in and out of shutdown, creating high peak power stresses
reducing the reliability of the device.
SHUTDOWN OPERATION
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.
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
ow 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.
BOOST OPERATION
With the VBOOST feature, the small signal stages of the ampli-
er are operated at higher supply voltages than the amplier’s
high current output stage. +VBOOST (pin 9), and –VBOOST (pin
5) are connected to the small signal circuitry of the amplier.
+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.
COMPENSATION
The external compensation components CC and RC are con-
nected 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.
1
SUPPLY TO OUTPUT DIFFERENTIAL (V)
OUTPUT CURRENT (A)
2 5 10
30
100
.3
.6
.9
1.2
1.5
3
6
9
12
15
30
DC T
C
= 125°C
DC T
C
= 85°C
DC T
C
= 25°C
t = 200ms
3 4 20
40 50
SOA
I
LIMIT
= .7/R
CL
Ri
1
2
10
11
R
CL
PA05
R
P
R
L
CL
CL
INPUT 7
R
f
FIGURE 1. CURRENT LIMIT
–LOGIC K1
SHUTDOWN
470Ω
Q1
FIGURE 2. SHUTDOWN OPERATION
12
12
SHUTDOWN
–LOGIC
A
B
PA05 • PA05A
PA05U 5
NEED TECHNICAL HELP? CONTACT APEX SUPPORT!
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For inquiries via email, please contact apex.support@apexanalog.com.
International customers can also request support by contacting their local Apex Microtechnology Sales Representative.
To nd the one nearest to you, go to www.apexanalog.com
IMPORTANT NOTICE
Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change
without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further
notice to any specications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this informa-
tion, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual
property rights. Apex Microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the informa-
tion only for use within your organization with respect to Apex Microtechnology integrated circuits or other products of Apex Microtechnology. 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.
APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR
LIFE SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDER-
STOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK.
Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnolgy, Inc. All other corporate names noted herein may be trademarks
of their respective holders.
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
www.apexanalog.com SEP 2012
PA05U REVL