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PDF PA93 Data sheet ( Hoja de datos )
| Número de pieza | PA93 | |
| Descripción | High Voltage Power Operational Amplifiers | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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®
P r o d uPc tAI9n 3n o v a t i o n F r o m
PA93PA93www.DataSheet4U.com
High Voltage Power Operational Amplifiers
FEATURES
♦ HIGH VOLTAGE — 400V (±200V)
♦ LOW QUIESCENT CURRENT — 10mA
♦ HIGH OUTPUT CURRENT — 8A
♦ PROGRAMMABLE CURRENT LIMIT
APPLICATIONS
♦ PIEZOELECTRIC POSITIONING
♦ HIGH VOLTAGE INSTRUMENTATION
♦ ELECTROSTATIC TRANSDUCERS
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 390V
DESCRIPTION
The PA93 is a high voltage, low quiescent current
MOSFET operational amplifier designed as a low cost
solution for driving continuous output currents up to 8A
and pulse currents up to 14A. The safe operating area
(SOA) has no second breakdown limitations and can
be observed for all type loads by choosing an appropri-
ate current limiting resistor. The MOSFET output stage
is biased AB for linear operation. External compensa-
tion provides flexibility in choosing bandwidth 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 Power SIP package
is electrically isolated.
EQUIVALENT SCHEMATIC
+VS R1A
R1B C1 R3
Q1 Q2
Q6
Q5
Q14A
CC2
CC1
Q14B
–IN R5
R8
R6
R9
+IN
Q15
R11
–VS
Q3
R4
Q4
Q8
Q11
ILIM
R7
Q13
Q12
OUT
Q18
R15
Q16
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.
PATENTED
12-pin SIP
PACKAGE
STYLE DP
Formed leads available
See package style EE
PA93wUww.cirrus.com
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
APEX − PAM9A3URR2E0V10J1
1 page  
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SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational am-
plifier has two distinct limitations:
1. The current handling capability of the MOSFET geom-
20
10
8
SOA
DC, TC = 25C
200mS
etry and the wire bonds.
6
2. The junction temperature of the output MOSFETs.
4
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 ad-
ditional internal power dissipation the amplifier can toler-
3
2
1
.8
.6
.4
.3
DC,T
C
DC,T
C
100mS
= 85C
= 125C
ate when it produces the necessary output to drive an
.2
external load.
INPUT PROTECTION
Although the PA93 can withstand differential voltages up
.1
.08
.0610
20 30 40 60 80 100
200 300 500
to ±20V, additional external protection is recommended.
Low leakage, low capacitance JFETs connected as di-
SUPPLY TO OUTPUT DIFFERENTIAL, VS – VO (V)
odes are recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differen-
+VS
tial input voltage will be clamped to ±1.4V. This is sufficient overdrive to
produce maximum power bandwidth.
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
–IN
Q1
Q2
+IN
1
Q3
Q4
2
11, 12
PA93
7, 8
6
power supply should be evaluated for transient performance including
power-on overshoot and power-off polarity reversals as well as line regu-
lation.
FIGURE 2.
OVERVOLTAGE
PROTECTION
Z2
–VS
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. Unidirectional transzorbs prevent this, and it is desirable that they be both electrically
and physically as close to the amplifier as possible.
STABILITY
The PA93 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 am-
plifier 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 lowers quiescent power
but also raises distortion since the output stage is then class C biased. The output stage bias current is nominally
set at 1mA. Pin 3 may be left open if not used.
PA93U
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet PA93.PDF ] | |
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