PA98_09 Datasheet, PDF (1/7 Pages) Cirrus Logic – Power Operational Amplifiers

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PA9P8A9•8P• APA9988AA
Power Operational Amplifiers
FEATURES
♦ HIGH VOLTAGE — 450V (±225V)
♦ HIGH SLEW RATE — 1000V/μS
♦ HIGH OUTPUT CURRENT — 200mA
APPLICATIONS
♦ HIGH VOLTAGE INSTRUMENTATION
♦ PIEZO TRANSDUCER EXCITATION
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 430V
♦ ELECTROSTATIC TRANSDUCERS &
DEFLECTION
DESCRIPTION
The PA98 is a high voltage, high power bandwidth
MOSFET operational amplifier designed for output
currents up to 200mA. Output voltages can swing up
to ±215V with a dual supply and up to +440 volts with
a single supply. The safe operating area (SOA) has
no second breakdown limitations and can be observed
with all types of loads by choosing an appropriate cur-
rent limiting resistor. High accuracy is achieved with a
cascode input circuit configuration. All internal biasing
is referenced to a bootstrapped zener-MOSFET cur-
rent source. As a result, the PA98 features an unprec-
edented supply range and excellent supply rejection.
The MOSFET output stage is biased on for linear oper-
ation. External compensation provides user flexibility.
This hybrid circuit utilizes thick film (cermet) resistors,
ceramic capacitors and silicon semiconductor chips to
maximize reliability, minimize size and give top perfor-
mance. Ultrasonically bonded aluminum wires provide
reliable interconnections at all operating temperatures.
The Power SIP package is electrically isolated.
Q1
Q6
–IN
1
Q10A
Q13
EQUIVALENT SCHEMATIC
Q2 ^Q3
Q7
+IN
2
Q10B
D2
11
D1
+V_S
12
D23
Q8 ^Q9
+V_S
COMP
45
Q11
Q12
Q17
9
C_L
10
C_L
6
OUT
Q18
Q15
8
–V_S
7
–V_S
PA98_wU_{ww.cirrus.com}
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
NOV 2009₁
APEX − PA98REVK