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PDF PA91 Data sheet ( Hoja de datos )
| Número de pieza | PA91 | |
| Descripción | High Voltage Power Operational Amplifiers | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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®
P r o d uPc tAI9n 1n o v a t i o n F r o m
PA91PA91www.DataSheet4U.com
High Voltage Power Operational Amplifiers
FEATURES
♦ HIGH VOLTAGE — 450V (±225V)
♦ 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 440V
DESCRIPTION
The PA91 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
R11
–VS
7
8
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.
Q3
Q8
Q11
Q13
Q12
Q16
R4
R7
Q4
ILIM
9
10
6
OUT
Q17
R10
R12
12-pin SIP
PACKAGE
STYLE DP
Formed leads available
See package style EE
PA91wUww.cirrus.com
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
APEX − PAM9A1RUR20E1V01I
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 ge-
ometry 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
energy flyback, external fast-recovery diodes should be
used.
SAFE OPERATING CURVES
The safe operating area curves define the maximum
additional internal power dissipation the amplifier can
tolerate when it produces the necessary output to drive
an external load.
500
300
200
100
50
30
20
SOA
200mS
100mS
DC, T
DC, T
C = 25°C
DC, T
C = 85°C
C = 125°C
INPUT PROTECTION
Although the PA91 can withstand differential voltages
PULSE CURVES @ 10% DUTY CYCLE MAX.
1025
50 75 100 125
250
500
up to ±20V, additional external protection is recom-
mended. Low leakage, low capacitance JFETs con-
SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V)
nected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure
2). The differential input voltage will be clamped to ±1.4V. This is
sufficient overdrive to produce maximum power bandwidth.
+VS
Z1
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recommended
as protection on the supply pins. See Figure 2. The zeners clamp
transients to voltages within the power supply rating and also clamp
power supply reversals to ground. Whether the zeners are used or
not, the system power supply should be evaluated for transient per-
–IN
Q1
Q2
+IN
1
Q3
Q4
2
11, 12
PA91
7, 8
6
formance including power-on overshoot and power-off polarity rever-
sals as well as line regulation.
Conditions which can cause open circuits or polarity reversals on
either power supply rail should be avoided or protected against. Re-
FIGURE 2.
OVERVOLTAGE
PROTECTION
Z2
–VS
versals or opens on the negative supply rail is known to induce input stage failure. Unidirectional transzorbs prevent
this, and it is desirable that they be both electrically and physically as close to the amplifier as possible.
STABILITY
The PA91 is externally compensated and performance can be tailored to the application. Use the graphs of small
signal response and power 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.
PA91U
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet PA91.PDF ] | |
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