APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
1
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".
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 resis-
tive to the PA05. Control logic turns off the amplifier's output
during shutdown.
EXTERNAL CONNECTIONS
PHASE COMPENSATION
Gain
C
C
R
C
1
470pF
120
>3
220pF
120
10
82pF
120
C
C
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/S
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
amplifier that extends the performance limits of power ampli-
fiers 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 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 175C.
EQUIVALENT SCHEMATIC
12-PIN POWER DIP
PACKAGE STYLE CR
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
2
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to V
S
100V
BOOST VOLTAGE
SUPPLY VOLTAGE +20V
OUTPUT CURRENT, continuous within SOA
30A
POWER DISSIPATION, internal
250W
INPUT VOLTAGE, differential
20V
INPUT VOLTAGE, common mode
V
B
TEMPERATURE, pin solder - 10s
300C
TEMPERATURE, junction
2
175C
TEMPERATURE, storage
65 to +150C
OPERATING TEMPERATURE RANGE, case
55 to +125C
PA05 PA05A
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 850C to avoid generating toxic fumes.
CAUTION
NOTES: * The specification of PA05A is identical to the specification for PA05 in applicable column to the left.
1. Unless otherwise noted: T
C
= 25C, C
C
= 470pF, R
C
= 120 ohms. DC input specifications are value given. Power supply volt-
age is typical rating. V
BOOST
= V
S
.
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.
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
V/C
OFFSET VOLTAGE, vs. supply
10
30
*
*
V/V
OFFSET VOLTAGE, vs. power
Full temperature range
30
10
V/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
10
11
*
INPUT CAPACITANCE
13
*
pF
COMMON MODE VOLTAGE RANGE
Full temperature range
V
B
8
*
V
COMMON MODE REJECTION, DC
Full temp. range, V
CM
= 20V
90
100
*
*
dB
INPUT NOISE
100KHz BW, R
S
= 1K
10
*
Vrms
GAIN
OPEN LOOP, @ 15Hz
Full temperature range, C
C
= 82pF
94
102
*
*
dB
GAIN BANDWIDTH PRODUCT
R
L
= 10
3
*
MHz
POWER BANDWIDTH
R
L
= 4, V
O
= 80V
P-P
, A
V
= 10
400
*
kHz
C
C
= 82pF, R
C
= 120
PHASE MARGIN
Full temperature range, C
C
= 470pF
60
*
OUTPUT
VOLTAGE SWING
I
O
= 20A
V
S
9.5 V
S
8.7
*
*
V
VOLTAGE SWING
V
BOOST
= Vs + 5V, I
O
= 30A
V
S
5.8 V
S
5.0
*
*
V
CURRENT, peak
30
*
A
SETTLING TIME to .1%
A
V
= +1, 10V step, R
L
= 4
2.5
*
s
SLEW RATE
A
V
= 10, C
C
= 82pF, R
C
= 120
80
100
*
V/s
CAPACITIVE LOAD
Full temperature range, A
V
= +1
2.2
*
nF
RESISTANCE
I
O
= 0, No load, 2MHz
5
*
I
O
= 1A, 2MHz
2
*
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 case
3
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 air
4
Full temperature range
12
*
C/W
TEMPERATURE RANGE, case
Meets full range specification
25
85
*
*
C
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
3
TYPICAL PERFORMANCE
GRAPHS
PA05 PA05A
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
4
OPERATING
CONSIDERATIONS
PA05 PA05A
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.apexmicrotech.com for design tools
that help automate tasks such as calculations for stability,
internal power dissipation, current limit; heat sink selection;
Apex's 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 amplifier out-
put side and pin 10 connected to the load side of the current
limit resistor, R
CL
, as shown in Figure 1. This connection will
bypass any parasitic resistances, R
P
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:
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier 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 fly-
back. However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
The output stage thermal protection circuit engages when
junction temperatures reach approximately 175C. If the con-
dition 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.
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 +V
S
. 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
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.
BOOST OPERATION
With the V
BOOST
feature, the small signal stages of the ampli-
fier are operated at higher supply voltages than the amplifier's
high current output stage. +V
BOOST
(pin 9), and V
BOOST
(pin
5) are connected to the small signal circuitry of the amplifier.
+V
S
(pin 8) and V
S
(pin 6) are connected to the high current
output stage. An additional 5V on the V
BOOST
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 +V
BOOST
and +V
S
pins must be
strapped together as well as the V
BOOST
and V
S
pins. The
boost voltage pins must not be at a voltage lower than the
V
S
pins.
COMPENSATION
The external compensation components C
C
and R
C
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 C
C
and R
C
for the application.
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA05U REV H AUGUST 2005 2005 Apex Microtechnology Corp.
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