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 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 resis-
tive to the PA05. Control logic turns off the amplier'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
amplier 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 amplier. 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 amplier to
operate at a higher voltage than the high current output stage.
The amplier is then biased to achieve close linear swings to
the supply rails at high currents for extra efcient 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
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PA05 • PA05A
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, +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 300°C
TEMPERATURE, junction2 175°C
TEMPERATURE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –55 to +125°C
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 850°C to avoid generating toxic fumes.
CAUTION
NOTES: * The specication of PA05A is identical to the specication for PA05 in applicable column to the left.
1. Unless otherwise noted: TC = 25°C, CC = 470pF, RC = 120 ohms. DC input specications 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 TESTCONDITIONS 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
POWERSUPPLY
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 specication –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
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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 specication
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, RCL, as shown in Figure 1. This connection will
bypass any parasitic resistances, RP formed by sockets and
solder joints as well as internal amplier 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 con-
dition remains that caused the shutdown, the amplier 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 amplier’s
high current output stage. +VBOOST (pin 9), and –VBOOST (pin
5) are connected to the small signal circuitry of the amplier.
+VS (pin 8) and –VS (pin 6) are connected to the high current
output stage. An additional 5V on the VBOOST pins is sufcient
to allow the small signal stages to drive the output transistors
into saturation and improve the output voltage swing for extra
efcient 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.
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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.
