CIRRUS PA78_07

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PA78
M I C R O T E C H N O L O G Y
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FEATURES
• A UNIQUE (Patent Pending) TECHNIQUE FOR VERY
LOW QUIESCENT CURRENT
• OVER 350 V/µS SLEW RATE
• WIDE SUPPLY VOLTAGE
• Single Supply: 20V to 350V
• Split Supplies: +/– 10V to +/– 175V
• OUTPUT CURRENT– 150mA cont. ; 200mA Pk
• UP TO 23 WATT DISSIPATION CAPABILITY
• OVER 200 kHz POWER BANDWIDTH
20–Pin PSOP
PACKAGE STYLE DK
APPLICATIONS
• PIEZOELECTRIC POSITIONING AND ACTUATION
• ELECTROSTATIC DEFLECTION
• DEFORMABLE MIRROR ACTUATORS
• CHEMICAL AND BIOLOGICAL STIMULATORS
12–Pin SIP
PACKAGE STYLE EU
LEAD FORM EW
TYPICAL APPLICATION
7
DESCRIPTION
The PA78 is a high voltage, high speed Precision IC power
op amp with performance and unique features not found previously in any commercially available OpAmp .
Novel input stage design of this amplifier provides extremely
high slew rates in pulse applications while maintaining low
quiescent current of under 1mA. This novel input stage also
has the effect of adding variables to the power response and
slew rate characteristics of the amplifier. To a lesser degree,
there are also input related effects on unity gain bandwidth
and phase. It is important to note that the slew rate is a strong
function of input voltage amplitude. It should be noted that the
package tab needs to be connected to a stable reference
such as GND for high slew rates. Please refer to special
considerations section for details.
The output stages are well protected with user defined
current limit although the Safe Operating Area (SOA) must
be observed for reliable protection. Proper heatsinking is
required for maintaining maximum reliability. External phase
compensation provides the user with great flexibility in trading
gain, stability and bandwidth.
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The PA78 is ideally suited to driving continuous drop ink jet
systems, in both piezo actuation and deflection applications.
The deflection amplifier shown above achieves accurate droplet
displacement at high speeds to deposit crisp, clear lot code
information on product containers. The external compensation
networks have been optimized to match the gain of the circuit
and the complex impedance of the load. The combination of
high voltage and high speed allow repeatable low cost deflection of droplets for high production environments.
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690–8600 • FAX (520) 888–3329 • ORDERS (520) 690–8601 • EMAIL prodlit@apexmicrotech.com
PA78
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SUPPLY VOLTAGE, +VS to −VS
OUTPUT CURRENT, peak (200ms)
POWER DISSIPATION, internal, DC
POWER DISSIPATION, internal, DC
INPUT VOLTAGE, Differential
INPUT VOLTAGE, Common Mode
TEMPERATURE, pin solder, 10s, EU
TEMPERATURE, junction2
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE, case
TEST CONDITIONS1
MIN
350V
200mA, within SOA
14W DK
23W EU
±15V
±Vs
260°C
150°C.
−55 to 125°C
−40 to 125°C
TYP
MAX
INPUT
OFFSET VOLTAGE, EU pkg
–25
8
25
OFFSET VOLTAGE, DK pkg
–40
8
40
OFFSET VOLTAGE vs. temperature
0 to 125°C (CaseTemperature)
−63
OFFSET VOLTAGE vs. supply
32
BIAS CURRENT, initial
8.5
200
OFFSET CURRENT, initial
12
400
INPUT RESISTANCE, DC
108
COMMON MODE VOLTAGE RANGE, pos.
+VS – 2
COMMON MODE VOLTAGE RANGE, neg.
–VS + 5.5
COMMON MODE REJECTION, DC
90
118
NOISE
700KHz
418
NOISE, VONOISE
500
GAIN
OPEN LOOP @ 1Hz
89
GAIN BANDWIDTH PRODUCT @ 1MHz
PHASE MARGIN
Full temperature range
120
1
50
OUTPUT
VOLTAGE SWING
IO = 10mA
|VS| − 2
|VS| − 8.6
|VS| − 12
VOLTAGE SWING
IO = 100mA
VOLTAGE SWING
IO = 150mA |VS| − 10
CURRENT, continuous, DC
150
Package Tab Connected to GND
100
350
SLEW RATE
SETTLING TIME, to 0.1%
5V Step (No Compensation)
1
POWER BANDWIDTH, 300VP–P
+VS = 160V, −VS = –160V
200
OUTPUT RESISTANCE, No Load
RCL = 6.2Ω
44
POWER SUPPLY
VOLTAGE
CURRENT, quiescent5
±150V Supply
±10
0.2
±150
0.7
±175
2.5
THERMAL
RESISTANCE, DC, Full temperature range
5.5
junction to case (PA78EU)
RESISTANCE, Full temperature range
12.21
junction to air (PA78EU)
RESISTANCE, DC, Full temperature range
8.3
9.1
junction to case (PA78DK)
RESISTANCE, Full temperature range
25
junction to air (PA78DK)6
RESISTANCE, Full temperature range
19.1
junction to air (PA78DK)7
TEMPERATURE RANGE, case
−40
125
UNITS
mV
mV
µV/°C
µV/V
pA
pA
Ω
V
V
dB
µV RMS
nV/√Hz
dB
MHz
°
V
V
V
mA
V/µS
µS
kHz
Ω
V
mA
°C/W
°C/W
°C/W
°C/W
°C/W
°C
NOTES: 1. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given, power supply voltage is typical rating.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve
high MTTF.
3. +VS and –VS denote the positive and negative supply voltages of the output stage.
4. Rating applies if output current alternates between both output transistors at a rate faster than 60Hz.
5. Supply current increases with signal frequency. See graph on page 4.
6. Rating applies when the heatslug of the DK package is soldered to a minimum of 1 square inch foil area of a printed circuit board.
7. Rating applies with the JEDEC conditions outlined in the Heatsinksing section of this datasheet.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546–2739
PA78
TYPICAL PERFORMANCE
GRAPHS
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OPERATING
CONSIDERATIONS
PA78
EXTERNAL CONNECTIONS – DK Package
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SAFE OPERATING AREA
The MOSFET output stage of the PA78
is not limited by second breakdown considerations as in bipolar output stages.
Only thermal considerations and current
handling capabilities limit the SOA. The
output stage is protected against transient
flyback by the parasitic body diodes of the
output stage MOSFET structure. However,
for protection against sustained high energy
flyback external fast–recovery diodes must
be used.
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The input signal amplitude to the PA78
amplifier is related to the overall phase
margin and unity gain bandwidth. For very
small signal amplitudes the amplifier phase
margin is negative and it shows instability.
If small signal stability is desired a constant current source of 500 uA (or resistor
for constant supply voltage) needs to be
added externally between CC– and +VS.
This current source has minor effects on
output offset voltage but helps immensely
with small signal stability. The following gain
and phase plots have been generated with
a 100k resistor (fixed dual supply voltage
+/– 50V) between CC– and +VS. Please
note that the unity gain bandwidth and
phase margin improves with larger signal
amplitude because of the unique differential
amplifier stage in the PA78.
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APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546–2739
PA78
OPERATING
CONSIDERATIONS
GENERAL
HEATSINKING
Please read Application Note 1 “General Operating Considerations” which covers stability, power 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.
The PA78DK package has a large exposed integrated copper
heatslug to which the monolithic amplifier is directly attached.
The solder connection of the heat slug to a 1 square inch foil
area on the printed circuit board will result in improved thermal performance of 25C/W. In order to improve the thermal
performance, multiple metal layers in the printed circuit board
are recommended. This may be adequate heatsinking but
the large number of variables involved suggest temperature
measurements be made on the top of the package. Do not
allow the temperature to exceed 85°C.
The junction to ambient thermal resistance of the DK package can achieve a 19.1C/W rating by using the PCB conditions
outlined in JEDEC standard: (JESD51–5):
PCB Conditions:
PCB Layers = 4L, Copper, FR–4
PCB Dimensions = 101.6 x 114.3mm
PCB Thickness = 1.6mm
Conditions:
Power dissipation = 2 watt
Ambient Temperature = 55°C
SPECIAL CONSIDERATIONS
It is very important to realize that in order to achieve
high frequency performance the heat sink tab has to be
tied to a stable, low impedance reference, i.e. power supply or GND. An AC connection through a 0.1µF capacitor
is also sufficient. Internal to the PA78, the heatsink tab
is electrically isolated to more than 350V . This may help
allay some electrical isolation concerns in tying the heat
sink to Vs or GND.
CURRENT LIMIT
For proper operation, the current limit resistor, Rlim, must
be connected as shown in the external connections diagram.
For maximum reliability and protection, the resistor should be
set as high as possible. The maximum practical value using
the following formula is 12 ohms. For even lower current limit
values, please see the CURRENT LIMIT vs. RESISTOR graph
on the TYPICAL PERFORMANCE GRAPHS page.
Rlim = 0.7 / Ilim
POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminals +Vs and –Vs
must be connected physically close to the pins to prevent local
parasitic oscillation in the output stage of the PA78. Use high
quality ceramic capacitors (X7R) 0.1μF or greater.
SUPPLY CURRENT
The PA78 features a class A/B driver stage to drive the output
MOSFETs and an innovative input stage to achieve very high
slew rates. The supply current drawn by the PA78, even with
no load, varies with the slew rate of the output signal.
STABILITY
The PA78 is externally compensated and performance can
be tailored to the application. Use the graphs of small signal
response and power response as a guide. Due to the innovative
design of the PA78, two compensation networks are required.
The values of these components should be the same to provide symmetric slew rate characteristics. The compensation
capacitor Cc must be rated at 500V working voltage. NPO
capacitors are recommended. The compensation networks
CcRc must be mounted closely to the amplifier pins 8 & 11
and 3 & 10 to avoid spurious oscillation.
The PA78 may require an external 33 pF capacitor (minimum breakdown of 350V) between Cc– and –Vs to prevent
oscillations in the falling edge of the output. This capacitor
is provided with the evaluation kit. Please refer to EK60U
datasheet for details.
ELECTROSTATIC DISCHARGE
Like many high performance MOSFET amplifiers, the PA78
very sensitive to damage due to electrostatic discharge (ESD).
Failure to follow proper ESD handling procedures could have
results ranging from reduced operating performance to catastrophic damage. Minimum proper handling includes the use
of grounded wrist or shoe straps, grounded work surfaces.
Ionizers directed at the work in progress can neutralize the
charge build up in the work environment and are strongly
recommended.
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
PA78U REV A JULY 2007 © 2007 Apex Microtechnology Corp.