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PDF PA243 Data sheet ( Hoja de datos )

Número de pieza PA243
Descripción High Voltage Power Operational Amplifier
Fabricantes APEX 
Logotipo APEX Logotipo



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PAP2A42433
High Voltage Power Operational Amplifier
FEATURES
• RoHS COMPLIANT
• SURFACE MOUNT PACKAGE
• MONOLITHIC MOS TECHNOLOGY
• LOW COST
• HIGH VOLTAGE OPERATION—350V
• LOW QUIESCENT CURRENT TYP.—2.2mA
• NO SECOND BREAKDOWN
• HIGH OUTPUT CURRENT—120 mA PEAK
APPLICATIONS
• TELEPHONE RING GENERATOR
• PIEZO ELECTRIC POSITIONING
• ELECTROSTATIC TRANSDUCER & DEFLECTION
• DEFORMABLE MIRROR FOCUSING
DESCRIPTION
The PA243 is a dual high voltage monolithic MOSFET op-
erational amplifier achieving performance features previously
found only in hybrid designs while increasing reliability. This
approach provides a cost-effective solution to applications
where multiple amplifiers are required. Inputs are protected
from excessive common mode and differential mode volt-
ages. The safe operating area (SOA) has no secondary
breakdown limitations and can be observed with all type
loads by choosing an appropriate current limiting resistor.
External compensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.
The PA243DF is packaged in a 24 pin PSOP (JEDEC
MO-166) package. The heatslug of the PA243DF package is
isolated in excess of full supply voltage.
TYPICAL APPLICATION
R 20R
VIN +175
20R
20R
+175
A
PA243
10pF
10pF
R CL
R CL
47
PIEZO
TRANSDUCER
47
B
PA243
–175
–175
RN
CN
Low Cost 660v p-p Piezo Drive
A single PA243 amplifier operates as a bridge driver for a piezo
transducer providing a low cost 660 volt total drive capability.
The RN CN network serves to raise the apparent gain of A2 at
high frequencies. If RN is set equal to R the amplifiers can be
compensated identically and will have matching bandwidths.
See application note 20 for more details.
24-pin PSOP
PACKAGE STYLE DF
EQUIVALENT SCHEMATIC (one of two channels)
Q1 Q2
+VS
CC1
CC2
+IN
-IN
D1
Q7
Q8
D4
Q3
Q5 Q6
Q10
Q9
Q4
ILIM
OUT
D2 Q11
D3
Q13
Q12 Q14
Q15
D5
EXTERNAL CONNECTIONS
-VS
* +Vsa
NC
La
COMPa
RCL COMPa
CC OUTa
NC
-INb
+INb
1
* -Vsb
+
A
-
B
24
-Vsa
*
NC
NC
+INa
-INa
NC
OUTb
COMPb
COMPb
ILb
CC
RCL
NC
+Vsb
*
For CC values, see graph on page 3.
Note: CC must be rated for full supply voltage.
* Supply bypassing required. See general Operating Con-
siderations.
PA24h3tUtp://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
APEX − PA24M3AUYR2E0V0G91

1 page




PA243 pdf
Product Innova tionFrom
PA243
These limitations can be seen in the SOA (see Safe Operat-
ing Area graphs). Note that each pulse capability line shows
a constant power level (unlike second breakdown limitations
where power varies with voltage stress).These lines are shown
for a case temperature of 25°C and correspond to thermal re-
sistances of 5.2°C/W for the PA243DF. Pulse stress levels for
other case temperatures can be calculated in the same manner
as DC power levels at different temperatures.The output stage
is protected against transient flyback by the parasitic diodes of
the output stage MOSFET structure. However, for protection
against sustained high energy flyback external fast-recovery
diodes must be used.
HEATSINKING
The PA243DF package has a large exposed integrated
copper heatslug to which the monolithic amplifier is directly
attached. The solder connection of the heatslug to a minimum
of 1 square inch foil area on the printed circuit board will result
in thermal performance of 25°C/W junction to air rating of the
PA243DF. Solder connection to an area of 1 to 2 square inches
is recommended. This may be adequate heatsinking but the
large number of variables involved suggest temperature mea-
surements be made on the top of the package. Do not allow
the temperature to exceed 85°C.
FIGURE 1
+Vs Z1
In the case of inverting circuits where the +IN pin is grounded,
the diodes mentioned above will also afford protection from
excessive common mode voltage. In the case of non-invert-
ing circuits, clamp diodes from each input to each supply will
provide protection. Note that these diodes will have substantial
reverse bias voltage under normal operation and diode leak-
age will produce errors.
Some applications will also need over-voltage protection
devices connected to the power supply rails. Unidirectional
zener diode transient suppressors are recommended. The
zeners clamp transients to voltages within the power sup-
ply rating and also clamp power supply reversals to ground.
Whether the zeners are used or not the system power sup-
ply should be evaluated for transient performance including
power-on overshoot and power-off polarity reversals as well
as line regulation. See Z1 and Z2 in Figure 1.
APPLICATION REFERENCES:
For additional technical information please refer to the fol-
lowing Application Notes:
AN1: General Operating Considerations
AN3: Bridge Circuit Drives
AN25: Driving Capacitive Loads
AN38: Loop Stability with Reactive Loads
-IN +Vs
Q1 Q2
+IN -Vs
OUT
Z2
-Vs
OVERVOLTAGE PROTECTION
Although the PA241 can withstand differential input voltages
up to 16V, in some applications additional external protection
may be needed.Differential inputs exceeding 16V will be clipped
by the protection circuitry.However, if more than a few milliamps
of current is available from the overload source, the protection
circuitry could be destroyed. For differential sources above
16V, adding series resistance limiting input current to 1mA will
prevent damage.Alternatively, 1N4148 signal diodes connected
anti-parallel across the input pins is usually sufficient. In more
demanding applications where bias current is important, diode
connected JFETs such as 2N4416 will be required. See Q1
and Q2 in Figure 1. In either case the differential input voltage
will be clamped to 0.7V. This is sufficient overdrive to produce
the maximum power bandwidth.
PA243U
5

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