APEX PA09A

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FEATURES
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POWER MOS TECHNOLOGY — 2A peak rating
HIGH GAIN BANDWIDTH PRODUCT — 150MHz
VERY FAST SLEW RATE — 200V/µs
PROTECTED OUTPUT STAGE — Thermal shutoff
EXCELLENT LINEARITY — Class A/B output
WIDE SUPPLY RANGE — ±12V to ±40V
LOW BIAS CURRENT, LOW NOISE — FET input
8-PIN TO-3
PACKAGE STYLE CE
APPLICATIONS
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DEFLECTION AMPLIFIER (FIGURE 1)
VIDEO DISTRIBUTION AND AND AMPLIFICATION
HIGH SPEED DEFLECTION CIRCUITS
POWER TRANSDUCERS TO 2MHz
COAXIAL LINE DRIVERS
POWER LED OR LASER DIODE EXCITATION
DESCRIPTION
The PA09 is a high voltage, high output current operational
amplifier optimized to drive a variety of loads from DC through
the video frequency range. Excellent input accuracy is achieved
with a dual monolithic FET input transistor which is cascoded
by two high voltage transistors to provide outstanding common
mode characteristics. All internal current and voltage levels
are referenced to a zener diode biased on by a current source.
As a result, the PA09 exhibits superior DC and AC stability
over a wide supply and temperature range.
High speed and freedom from second breakdown is assured
by a complementary Power MOS output stage. For optimum
linearity, especially at low levels, the Power MOS transistors
are biased in the class A/B mode. Thermal shutoff provides
full protection against overheating and limits the heatsink
requirements to dissipate the internal power losses under
normal operating conditions. A built-in current limit protects the
amplifier against overloading. Transient inductive load kickback
protection is provided by two internal clamping diodes. External
phase compensation allows the user maximum flexibility in
obtaining the optimum slew rate and gain bandwidth product
at all gain settings. For continuous operation under load, a
heatsink of proper rating is recommended.
This hybrid integrated circuit utilizes thick film (cermet) resistors, ceramic capacitors and silicon semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The CE, 8-pin TO-3
package is hermeti����
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The deflection amplifier circuit of Figure 1 achieves arbitrary beam positioning for a fast heads-up display. Maximum
transition times are 4µs while delivering 2A pk currents to the
13mH coil. The key to this circuit is the sense resistor (RS)
which converts yoke current to voltage for op amp feedback.
This negative feedback forces the coil current to stay exactly
proportional to the control voltage. The network consisting of
RD, RF and CF serves to shift from a current feedback via RS to
a direct voltage feedback at high frequencies. This removes
the extra phase shift caused by the inductor thus preventing
oscillation. See Application Note 5 for details of this and other
precision magnetic deflection circuits.
EQUIVALENT SCHEMATIC
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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
PA09 • PA09A
ABSOLUTE MAXIMUM RATINGS
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal1
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s
TEMPERATURE, junction1
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
TEST CONDITIONS 2
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
BIAS CURRENT, initial
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE3
COMMON MODE REJECTION, DC
.5
10
10
5
.01
2.5
1011
6
Full temperature range
± VS–10 ± VS–8
Full temperature range, VCM = ± 20V
104
GAIN
OPEN LOOP GAIN at 15Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH
POWER BANDWIDTH
RL = 1kΩ
CC = 5pF
RL = 15Ω, CC = 5pF
RL = 15Ω, CC = 100pF
OUTPUT
VOLTAGE SWING3
CURRENT, PEAK
SETTLING TIME to 1%
SETTLING TIME to .1%
SLEW RATE
SLEW RATE
RESISTANCE
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
THERMAL
RESISTANCE, AC junction to case4
RESISTANCE, DC junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
MIN
PA09
TYP
PARAMETER
Full temperature range
Full temperature range, IO = 2A
4V step, CC = 100pF
4V step, CC = 100pF
CC = 5pF
CC = 100pF
Full temperature range
Full temperature range, F > 60Hz
Full temperature range, F < 60Hz
Full temperature range
Meets full range specifications
80
80V
5A
78W
40V
±VS
300°C
150°C
–65 to +150°C
–55 to +125°C
MAX
±3
30
100
50
*
98
150
750
150
± VS –8 ± VS –7
4.5
.75
1.3
220
25
7.5
± 12
–25
MIN
± 35
70
± 40
85
1.2
1.6
30
25
1.3
1.8
+ 85
PA09A
TYP
± .25
5
*
3
*
1.5
*
*
*
*
MAX
UNITS
± .5
10
mV
µV/°C
µV/V
pA
pA/V
pA
Ω
pF
V
dB
20
10
*
*
*
*
dB
MHz
KHz
KHz
*
*
*
*
*
*
*
*
V
A
µs
µs
V/µs
V/µs
Ω
*
*
*
*
*
V
mA
*
*
*
*
*
*
°C/W
°C/W
°C/W
°C
*
*
NOTES: * The specification of PA09A is identical to the specification for PA09 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. Unless otherwise noted: TC = 25°C, supply voltage = ±35V.
3. +VS and -VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS.
4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
CAUTION
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.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
PA09 • PA09A
TYPICAL PERFORMANCE
GRAPHS
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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
PA09 • PA09A
GENERAL
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 complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
SUPPLY VOLTAGE
The specified voltage (±VS) applies for a dual (±) supply
having equal voltages. A nonsymmetrical (ie. +70/–10V) or a
single supply (ie. 80V) may be used as long as the total voltage between the +VS and –VS rails does not exceed the sum
of the voltages of the specified dual supply.
SAFE OPERATING AREA (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.
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SAFE OPERATING AREA CURVES
The SOA curves combine the effect of these limits and allow
for internal thermal delays. For a given application, the direction and magnitude of the output current should be calculated
or measured and checked against the SOA curves. This is
simple for resistive loads but more complex for reactive and
EMF generating loads. The following guidelines may save
extensive analytical efforts:
1. Capacitive and inductive loads up to the following maximums
are safe:
CAPACITIVE LOAD
INDUCTIVE LOAD
±VS
40V
.1µF
11mH
30V
500µF
24mH
20V
2500µF
75mH
15V
∞
100mH
2. Short circuits to ground are safe with dual supplies up to
±20V.
3. The output stage is protected against transient flyback.
However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
BYPASSING OF SUPPLIES
Each supply rail must be bypassed to common with a
tantalum capacitor of at least 47µF in parallel with a .47µF
ceramic capacitor directly connected from the power supply
pins to the ground plane.
OUTPUT LEADS
Keep the output leads as short as possible. In the video
frequency range, even a few inches of wire have significant
inductance, raising the interconnection impedance and limiting the output current slew rate. Furthermore, the skin effect
increases the resistance of heavy wires at high frequencies.
Multistrand Litz Wire is recommended to carry large video
currents with low losses.
GROUNDING
Single point grounding of the input resistors and the input
signal to a common ground plane will prevent undesired current
feedback, which can cause large errors and/or instabilities.
"Single point" is a key phrase here; a ground plane should
be used as shielding rather than a current path. Leaving the
case of the PA09 floating will cause oscillations in some applications.
COMPENSATION
The PA09 is extremely flexible in terms of choice of compensation capacitor for any given gain. The most common
ranges are shown in the COMPENSATION typical performance
graph. Swinging closer to the supply rails, heavier loads, faster
input signal rise and fall times and higher supply voltages all
tend to demand larger values of compensation capacitor. This
capacitor must be rated at least as high as the total voltage
applied to the amplifier. In making specific value choices, use
the square wave stability test presented in APPLICATION
NOTE 19, Figures 40 and 41.
In addition to small signal testing, if the application includes
step functions in the input signal, use this circuit to measure
large signal response. By increasing square wave amplitude to
the maximum of the application, this test may show significant
distortion of the output waveform following the square wave
transitions. In this case the faster input stages of the PA09
are out-running the output stage and overload recovery time
creates the distortion. This speed relationship is also why
slew rate does not increase for compensation values below
about 27pF.
SUPPLY CURRENT
When swinging large signals, the output stage of the PA09
demands extra supply current. The following graphs illustrate
this current for several conditions for both sine and square
wave signals. Current is exclusive of any load current and will
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
4
PA09 • PA09A
OPERATING
CONSIDERATIONS
affect both supply rating and thermal ratings. When calculating internal power dissipation, multiply this current times total
supply voltage.
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STABILITY
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Due to its large bandwidth the PA09 is more likely to oscillate than lower bandwidth Power Operational Amplifiers.
To prevent oscillations a reasonable phase margin must be
maintained by:
1. Pay very careful attention to supply bypassing and circuit
grounding. This is very important when step functions are
driven and the PA09 shares supplies with more active
devices.
2. Keeping the external sumpoint stray capacitance to ground
at a minimum and the sumpoint load resistance (input and
feedback resistors in parallel) below 500Ω. Larger sumpoint
load resistances can be used with increased phase compensation and/or bypassing of the feedback resistor.
3. Connect the case to a local AC ground potential.
CURRENT LIMIT
Internal current limiting is provided in the PA09. Note the
current limit curve given under typical performance graphs is
based on junction temperature. If the amplifier is operated at
cold junction temperatures, current limit could be as high as 8
amps. This is above the maximum allowed current on the SOA
curve of 5 amps. Systems using this part must be designed to
keep the maximum output current to less than 5 amps under all
conditions. The internal current limit only provides this protection for junction temperatures of 80°C and above.
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oscillate in and out of shutdown. This will result in high peak
power stresses, destroy signal integrity, and reduce the reliability of the device.
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Note that swinging closer to the supply rail demands more
current. Output voltage is given as peak. Currents are average responding supply readings, but AC monitoring will reveal
current pulses corresponding to periods of high slew rate.
For example, driving ±30V outputs at 500KHz on ±40V supplies produces a .8A pulse during negative slew and a 1.2A
pulse during positive slew. If the input signal is over driven
by several times the output swing capability, pulses up to 4A
may be seen.
THERMAL SHUTDOWN PROTECTION
The thermal protection circuit shuts off the amplifier when
the substrate temperature exceeds approximately 150°C. This
allows heatsink selection to be based on normal operating
conditions while protecting the amplifier against excessive
junction temperature during temporary fault conditions.
Thermal protection is a fairly slow-acting circuit and therefore
does not protect the amplifier against transient SOA violations
(areas outside of the TC = 25°C boundary). It is designed to
protect against short-term fault conditions that result in high
power dissipation within the amplifier, If the conditions that
cause thermal shutdown are not removed, the amplifier will
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
subject to change without notice.
APEX
MICROTECHNOLOGY
CORPORATION
• TELEPHONE
(520)
690-8600
• FAX (520)
888-3329
ORDERS (520)
690-8601
• EMAILare
prodlit@apexmicrotech.com
PA09U REV K AUGUST 2005
© 2005 Apex Microtechnology Corp.
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