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PDF PA241 Data sheet ( Hoja de datos )
| Número de pieza | PA241 | |
| Descripción | High Voltage Power Operational Amplifier | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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P r o dPu cAt 2I n4n1o v a t i o n F r o m
PA241PA241www.DataSheet4U.com
High Voltage Power Operational Amplifier
FEATURES
• RoHS COMPLIANT
• MONOLITHIC MOS TECHNOLOGY
• LOW COST
• HIGH VOLTAGE OPERATION—350V
• LOW QUIESCENT CURRENT TYP.—2.2mA
• NO SECOND BREAKDOWN
• HIGH OUTPUT CURRENT—120mA PEAK
• AVAILABLE IN DIE FORM—CPA241
8-PIN TO-3
24-PIN PSOP
10-PIN SIP
APPLICATIONS
PACKAGE STYLE CE PACKAGE STYLE DF
PACKAGE STYLE DW
• PIEZO ELECTRIC POSITIONING
TYPICAL APPLICATION
• ELECTROSTATIC TRANSDUCER & DEFLECTION
Ref:APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifiers"
• DEFORMABLE MIRROR FOCUSING
• BIOCHEMISTRY STIMULATORS
R 20R
V IN +175
20R 20R
+175
• COMPUTER TO VACUUM TUBE INTERFACE
DESCRIPTION
The PA241 is a high voltage monolithic MOSFET operational
amplifier which achieves performance features previously
found only in hybrid designs while increasing reliability. Inputs
A1
PA241
10pF
10pF
R CL
R CL
47
PIEZO
TRANSDUCER
47
A2
PA241
Rn
Cn
are protected from excessive common mode and differential
mode voltages. The safe operating area (SOA) has no second
breakdown limitation 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 PA241CE is packaged in a hermetically sealed 8-pin
TO-3 package. The metal case of the PA241CE is isolated in
LOW COST 660V p-p
–175
PIEZO DRIVE
–175
Two PA241 amplifiers operated as a bridge driver for a piezo
transducer provides 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.
excess of full supply voltage.
The PA241DF is packaged in a 24 pin PSOP (JEDEC MO-
166) package. The metal heat slug of the PA241DF is isolated
in excess of full supply voltage.
The PA241DW is packaged in Apex Precision Power’s her-
metic ceramic SIP package. The alumina ceramic isolates the
die in excess of full supply voltage.
EQUIVALENT SCHEMATIC
+VS
EXTERNAL CONNECTIONS
PA241CE
PA241DW
RCL 1 2 3 4 5 6 7 8 9 10
CC NC NC -VS +VS ILIM CC2 CC1 OUT
CC1 3
2 CC2
1 ILIM
OUT 4
TOP VIEW
5
–IN 6
+IN
8
7 +VS
–VS
-IN +IN
CC
RCL
For CC values, see graph on page 4.
Note: CC must be rated for full supply
voltage.
PA241DF
CC1
CC2
+IN
1NC
NC
24 NC
NC
ILIM
NC
NC
NC
OUT
-IN NC
-IN
OUT
NC
COMP
+IN
NC
NC
COMP
CC
RCL
NC NC
NC ILIM
NC NC
-VS +VS
NOTE: PA241CE Recommended mounting torque is 4-7
in•lbs (.45 -.79 N•m)
CAUTION: The use of compressible, thermally conductive
-VS insulators may void warranty.
PA24w1wUw.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
APEX − PA2D4E1CUR20E0V91I
1 page  
Product Innovation From
PA241www.DataSheet4U.com
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, power supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.Cirrus.com for design tools that help
automate tasks such as calculations for stability, internal power
dissipation, current limit, heat sink selection, Apex Precision
Power's complete Application Notes library, Technical Seminar
Workbook and Evaluation Kits.
PHASE COMPENSATION
Open loop gain and phase shift both increase with increas-
ing temperature. The PHASE COMPENSATION typical graph
shows closed loop gain and phase compensation capacitor
value relationships for four case temperatures.The curves are
based on achieving a phase margin of 50°. Calculate the high-
est case temperature for the application (maximum ambient
temperature and highest internal power dissipation) before
choosing the compensation. Keep in mind that when working
with small values of compensation, parasitics may play a large
role in performance of the finished circuit. The compensation
capacitor must be rated for at least the total voltage applied
to the amplifier and should be a temperature stable type such
as NPO or COG.
OTHER STABILITY CONCERNS
There are two important concepts about closed loop gain
when choosing compensation. They stem from the fact that
while "gain" is the most commonly used term, β (the feedback
factor) is really what counts when designing for stability.
1. Gain must be calculated as a non-inverting circuit (equal
input and feedback resistors can provide a signal gain of
-1, but for calculating offset errors, noise, and stability, this
is a gain of 2).
2. Including a feedback capacitor changes the feedback factor
or gain of the circuit. Consider Rin=4.7k, Rf=47k for a gain
of 11. Compensation of 4.7 to 6.8pF would be reasonable.
Adding 33pF parallel to the 47k rolls off the circuit at 103kHz,
and at 2MHz has reduced gain from 11 to roughly 1.5 and
the circuit is likely to oscillate.
As a general rule the DC summing junction impedance
(parallel combination of the feedback resistor and all input
resistors) should be limited to 5k ohms or less. The amplifier
input capacitance of about 6pF, plus capacitance of connecting
traces or wires and (if used) a socket will cause undesirable
circuit performance and even oscillation if these resistances
are too high. In circuits requiring high resistances, measure or
estimate the total sum point capacitance, multiply by Rin/Rf, and
parallel Rf with this value. Capacitors included for this purpose
are usually in the single digit pF range. This technique results
in equal feedback factor calculations for AC and DC cases. It
does not produce a roll off, but merely keeps β constant over
a wide frequency range. Paragraph 6 of Application Note 19
details suitable stability tests for the finished circuit.
CURRENT LIMIT
For proper operation, the current limit resistor, Rcl, must be
connected as shown in the external connection diagram. The
minimum value is 3.9 ohms, however for optimum reliability,
the resistor should be set as high as possible. The maximum
practical value is 110 ohms. Current limit values can be pre-
dicted as follows:
Ilimit
=
Vbe
Rcl
Where Vbe is shown in the CURRENT LIMIT typical
graph.
Note that +Vbe should be used to predict current through
the +Vs pin, -Vbe for current through the -Vs pin, and that they
vary with case temperature. Value of the current limit resistor
at a case temperature of 25° can be estimated as follows:
Rcl
=
0.7
Ilimit
When the amplifier is current limiting, there may be spurious
oscillation present during the current limited portion of the nega-
tive half cycle.The frequency of the oscillation is not predictable
and depends on the compensation, gain of the amplifier, value
of the current limit resistor, and the load. The oscillation will
cease as the amplifier comes out of current limit.
SAFE OPERATING AREA
The MOSFET output stage of the PA241 is not limited by
second breakdown considerations as in bipolar output stages.
However there are still three distinct limitations:
1. Voltage withstand capability of the transistors.
2. Current handling capability of the die metalization.
3. Temperature of the output MOSFETS.
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
resistances of 5.2°C/W for the PA241CE and DF and 10.4°C/W
for the PA241DW respectively. 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 PA241DF 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
PA241DF. 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.
PA241U
5
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| PDF Descargar | [ Datasheet PA241.PDF ] | |
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