APEX PA96

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FEATURES
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HIGH VOLTAGE - 300 VOLTS
HIGH OUTPUT CURRENT – 1.5 AMPS
70 WATT DISSIPATION CAPABILITY
175 MHz GAIN BANDWIDTH
250 V/µ-SECOND SLEW RATE
APPLICATIONS
PZT DRIVE
MAGNETIC DEFLECTION
PROGRAMMABLE POWER SUPPLIES
70V LINE AUDIO to 70W
TYPICAL APPLICATION
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DESCRIPTION
The PA96 is a state of the art high voltage, high current
operational amplifier designed to drive resistive, capacitive
and inductive loads. For optimum linearity, the output stage
is biased for class A/B operation. External compensation
provides user flexibility in maximizing bandwidth at any gain
setting. The safe operating area (SOA) can be observed for
all operating conditions by selection of user programmable
current limit. For continuous operation under load, a heatsink
of proper rating is required.
The hybrid integrated circuit utilizes thick film (cermet)
resistors, ceramic capacitors and semiconductor chips to
maximize reliability, 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.
8-PIN TO-3
PACKAGE STYLE CE
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PA96
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EQUIVALENT CIRCUIT DIAGRAM
PZT POSITION CONTROL
The MOSFET output stage of the PA96 provides superior
SOA performance compared to bipolar output stages where
secondary breakdown is a concern. The extended SOA is
ideal in applications where the load is highly reactive and
may impose simultaneously both high voltage and high current across the output stage transistors. In the figure above
a piezo-electric transducer is driven to high currents and high
voltages by the PA96.
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EXTERNAL CONNECTIONS
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
D
PA96
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to −VS
OUTPUT CURRENT, continuous
POWER DISSIPATION, internal, DC
INPUT VOLTAGE, common mode
INPUT VOLTAGE, differential
TEMPERATURE, pin solder, 10s
TEMPERATURE, junction2
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE, case
300V
1.5A,
70W
+VS to −VS
±15V
300°C
150°C
−65 to 150°C
−55 to 125°C
SPECIFICATIONS
PARAMETER
INPUT
OFFSET VOLTAGE
OFFSET VOLTAGE vs. temperature
OFFSET VOLTAGE vs. supply
BIAS CURRENT, initial3
BIAS CURRENT vs. supply
OFFSET CURRENT, initial
INPUT RESISTANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE
COMMON MODE VOLTAGE RANGE
COMMON MODE REJECTION, DC
NOISE
GAIN
OPEN LOOP @ 15Hz
GAIN BANDWIDTH PRODUCT @ 1MHz
PHASE MARGIN
PBW
OUTPUT
VOLTAGE SWING
VOLTAGE SWING
VOLTAGE SWING
VOLTAGE SWING
CURRENT, continuous, DC
SLEW RATE
SETTLING TIME, to 0.1%
RESISTANCE, open loop
THERMAL
RESISTANCE, AC Junction to Case
RESISTANCE, DC Junction to Case
RESISTANCE, Junction to Ambient
TEST CONDITIONS1
MIN
Full temperature range
TYP
MAX
UNITS
1
20
5
50
20
200
0.1
50
6
mV
µV/°C
µV/V
pA
pA/V
pA
GΩ
pF
V
V
dB
µV RMS
114
175
dB
MHz
100
4
+VS − 13
−VS + 13
92
100KHz bandwidth, 1kΩ Rs
RL= 1kΩ, CC=100pF
VS = 150V, -VS = 150V,
A = -100, RF = 100K
Full temperature range, using
recommended CC for gain.
250V p-p output, 100Ω,
+150V Supplies, Cc = 0pf
IO = 1.5A
IO = −1.5A
IO = 0.1A
IO = −0.1A
AV = −100, ±150V Supplies, 250Ω load
negative slope, Positiveslope much
faster
AV = −100, 1V Step, CC = 0pF
DC, 1A Load
Full temperature range. f > 60Hz
Full temperature range. f < 60Hz
96
100
60
+VS − 12
−VS + 12
+VS − 8
−VS + 8
1.5
200
°
100
KHz
+VS − 5.6
−VS + 10
V
V
V
V
A
V/µS
250
2
7
1.2
1.6
30
10
1.3
1.8
µS
Ω
°C/W
°C/W
°C/W
POWER SUPPLY
VOLTAGE
±15
±100
±150
V
CURRENT, Quiescent total
25
30
35
mA
CURRENT, Quiescent output stage only
10
mA
NOTES: * The specification of PA08A is identical to the specification for PA08 in applicable column to the left.
1. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve
high MTTF.
2. The power supply voltage specified under typical (TYP) applies unless otherwise noted.
3. Doubles for every 10oC of temperature increase.
4. +VS and –VS denote the positive and negative supply rail respectively.
5. Rating applies only if output current alternates between both output transistors at a rate faster than 60Hz.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
CAUTION
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
PA96
TYPICAL PERFORMANCE
GRAPHS
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PA96
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
OPERATING
CONSIDERATIONS
PA96
GENERAL
COMPENSATION TABLE
Please read Application Note 1 “General Operating Considerations” 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 Application Notes library, Technical Seminar Workbook,
and Evaluation Kits.
The following table tabulates recommended compensation
capacitor values vs. gain. These values will typically result in
less than 2% overshoot and a -3db small signal bandwidth of
greater than 1MHz, except under operating conditions where
uncompensated gain bandwidth is too low to support a 1MHz
bandwidth. (See gain bandwidth vs. Plus power supply curves).
Note that other factors such as capacitance in parallel with
the feedback resistor may reduce circuit bandwidth from that
determined from the gain bandwidth curve.
SPECIAL PRECAUTIONS
The PA96 operates with up 300V rail to rail voltage, and
delivers amperes of current. Precautions should be taken for
the safety of the user and the amplifier.
Although the non-operating common mode input range is rail
to rail, the differential input voltage must not exceed ±15 V.
Therefore; if the feedback ratio is less than 10, even if
caused by disconnecting a signal source , typical power turn
on transients can destroy the amplifier.
Similarly in a voltage follower application a large differential
transient can be generated if the slew rate of the input is greater
than that of the voltage follower.
Therefore it is prudent to clamp the input with series back
to back diodes as shown below.
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If experimentally optimizing the compensation capacitor,
turn off the supplies and let them bleed to low voltage before
installing each new value. Otherwise internal current pulses of
up to 3 amps can be induced. Also, do you want your fingers
around 300V?
Essentially the full rail to rail power supply voltage may be
applied to the compensation capacitor. A 400V COG or Mica
capacitor is recommended.
POWER BANDWIDTH
The power bandwidth is 1/(π x the negative edge slew time).
The slew time is determined by the compensation capacitor,
load, and internal device capacitance; it is independent of
closed loop gain. The uncompensated power bandwidth is
typically 100kHz for a 250Vp-p output signal into 100Ω. It typically increases to above 300KHz with no load.
Cc
150pf
51pf
33pf
22pf
10pf
5pf
None
Cc
330 pf
150pf
51pf
33pf
22pf
10pf
5pf
None
Inverting Gain
From
To
1
2
2
5
5
10
10
20
20
50
50
100
100
up
Non-Inverting Gain
From
To
1
2
2
3
3
6
6
10
10
20
20
50
50
100
100
up
CURRENT LIMIT
For proper operation the current limit resistor, Rcl, must
be connected as shown in the external connections diagram.
The minimum value is 0.2Ω, with a maximum practical value of
100Ω. For optimum reliability the resistor should be set as high
as possible. The value is calculated as IL = 0.68V/Rcl. Note that
the 0.68V is reduced by 2mV every °C rise in temperature.
Also note that the current limit can be set such that the SOA
is exceeded on a continuous basis. As an example if the current
limit was set at 1.5A and the supply was at 150V, a short to
ground would produce 225 watts internal dissipation, greatly
exceeding the 83 watt steady state SOA rating.
Under some conditions of load and compensation the amplifier may oscillate at a low level when current limit is active,
even though the amplifier is stable otherwise. The current
will be limited to the programmed value in this situation. To
minimize such occurrences, use a non-reactive resistor to
program current limit.
This data
sheet has been carefullyCORPORATION
checked and is believed
to beNORTH
reliable, however,
no responsibility
is assumed for
possible inaccuracies
omissions.
All specificationsHOTLINE:
are subject to1 change
notice.
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • TUCSON,
ARIZONA
85741 • orUSA
• APPLICATIONS
(800)without
546-2739
4
PA96U REV B DECEMBER 2005
© 2005 Apex Microtechnology Corp.