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PA91
PA91
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.
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
DESCRIPTION
APPLICATIONS
♦ PIEZOELECTRIC POSITIONING
♦ HIGH VOLTAGE INSTRUMENTATION
♦ ELECTROSTATIC TRANSDUCERS
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 440V
EQUIVALENT SCHEMATIC
12
11
+V
S
R1 R2
C1
R3
Q1
Q6
Q5
Q14A
1
–IN
R5
R8
2
+IN
Q15
R11
Q2
5
CC2
Q3
R4
Q4
ILIM
9
4
CC1
Q14B
R6
R9
Q8
Q11
R7
10
6
OUT
Q12
3
I
Q
Q16
Q13
R10
Q17
–V
S
7
8
R12
PA91U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
JUN 2009
1
APEX − PA91UREVH
CIRRUS [ CIRRUS LOGIC ]
