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PDF PA90 Data sheet ( Hoja de datos )
| Número de pieza | PA90 | |
| Descripción | High Voltage Power Operational Amplifiers | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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®
P r o dPu cAt 9I n0n o v a t i o n F r o m
PA90PA90www.DataSheet4U.com
High Voltage Power Operational Amplifiers
FEATURES
♦ HIGH VOLTAGE — 400V (±200V)
♦ LOW QUIESCENT CURRENT — 10mA
♦ HIGH OUTPUT CURRENT — 200mA
♦ PROGRAMMABLE CURRENT LIMIT
♦ HIGH SLEW RATE — 300V/µs
APPLICATIONS
♦ PIEZOELECTRIC POSITIONING
♦ HIGH VOLTAGE INSTRUMENTATION
♦ ELECTROSTATIC TRANSDUCERS
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 390V
DESCRIPTION
The PA90 is a high voltage, low quiescent current
MOSFET operational amplifier designed as a low cost
solution for driving continuous output currents up to
200mA and pulse currents up to 350mA. The safe oper-
ating area (SOA) has no second breakdown limitations
and can be observed for all type loads by choosing
an appropriate current limiting resistor. The MOSFET
output stage is biased AB for linear operation. Exter-
nal compensation provides flexibility in choosing band-
width and slew rate for the application. Apex Precision
Power’s Power SIP package uses a minimum of board
space allowing for high density circuit boards. The 12-
pin PowerSIP package is electrically isolated.
EQUIVALENT SCHEMATIC
12
11
+VS
R1 R2
C1
R3
Q1 Q2
Q6
Q5
Q14A
1
–IN R5
R8
2
+IN
Q15
5
4 CC2
CC1
Q14B
R6
R9
3
IQ
Q3
Q8
Q11
Q13
Q12
Q16
R4
R7
Q4
ILIM
9
10
6
OUT
Q17
R10
R11
–VS
7
8
R12
EXTERNAL CONNECTIONS
1 2 3 4 5 6 7 8 9 10 11 12
Rc
–IN +IN
IQ
(See text.)
Cc
RCL
*
–Vs
*
TO LOAD
AND FEEDBACK
+Vs
* Bypassing required.
12-pin SIP
PACKAGE
STYLE DP
Formed leads available
See package EE
PA90wUww.cirrus.com
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
APEX − PAM90AURR2E0V1K01
1 page  
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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.
NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high en-
ergy flyback, external fast-recovery diodes should be used.
SAFE OPERATING CURVES
The safe operating area curves define the maximum ad-
ditional internal power dissipation the amplifier can toler-
ate when it produces the necessary output to drive an
external load.
500
300
200
SOA
200mS
100mS
INPUT PROTECTION
Although the PA90 can withstand differential voltages up
to ±20V, additional external protection is recommended.
Low leakage, low capacitance JFETs connected as di-
odes are recommended (e.g. 2N4416, Q1-Q4 in Fig-
ure 2). The differential input voltage will be clamped to
±1.4V. This is sufficient overdrive to produce maximum
power bandwidth.
100
50
30
DC, T
DC, T
C = 25°C
DC, T
C = 85°C
C = 125°C
POWER SUPPLY PROTECTION
20
Unidirectional zener diode transient suppressors are
recommended as protection on the supply pins. See
Figure 2. The zeners clamp transients to voltages within
PULSE CURVES @ 10% DUTY CYCLE MAX.
1025
50 75 100 125
250
500
the power supply rating and also clamp power supply
reversals to ground. Whether the zeners are used or not,
SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V)
the system power supply should be evaluated for transient performance
+VS
including power-on overshoot and power-off polarity reversals as well as
Z1
line regulation.
Conditions which can cause open circuits or polarity reversals on either
power supply rail should be avoided or protected against. Reversals or
opens on the negative supply rail is known to induce input stage failure.
–IN
Q1
1
Q3
11, 12
PA90
6
Unidirectional transzorbs prevent this, and it is desirable that they be
Q2
Q4
both electrically and physically as close to the amplifier as possible.
+IN
2 7, 8
STABILITY
The PA90 is externally compensated and performance can be tailored
to the application. Use the graphs of small signal response and power
FIGURE 2.
OVERVOLTAGE
PROTECTION
Z2
–VS
response as a guide. The compensation capacitor CC must be rated at 500V working voltage. An NPO capacitor
is recommended. The compensation network CCRC must be mounted closely to the amplifier pins 4 and 5 to avoid
spurious oscillation.
QUIESCENT CURRENT REDUCTION
When pin 3 (IQ) is shorted to pin 5 (CC2) the AB biasing of the output stage is disabled. This raises distortion since
the output stage is then class C biased, but reduces the quiescent current by 1mA for a power dissipation savings
of 0.4W. Pin 3 may be left open if not used.
PA90U
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet PA90.PDF ] | |
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