PA95_09 Datasheet, PDF (1/6 Pages) Cirrus Logic – High Voltage Power Operational Amplifiers

P r o d u c t IInnnnoovvaa t i o n FFrroomm
PAP9A955
High Voltage Power Operational Amplifiers
FEATURES
♦ HIGH VOLTAGE — 900V (±450V)
♦ LOW QUIESCENT CURRENT — 1.6mA
♦ HIGH OUTPUT CURRENT — 100mA
♦ PROGRAMMABLE CURRENT LIMIT
APPLICATIONS
♦ HIGH VOLTAGE INSTRUMENTATION
♦ PROGRAMMABLE POWER SUPPLIES UP
TO ±430V
♦ MASS SPECTROMETERS
♦ SEMICONDUCTOR MEASUREMENT
EQUIPMENT
DESCRIPTION
The PA95 is a high voltage, MOSFET operational am-
plifier designed as a low cost solution for driving contin-
uous output currents up to 100mA and pulse currents
up to 200mA into capacitive loads. The safe operating
area (SOA) has no second breakdown limitations and
can be observed for all load types by choosing an ap-
propriate current limiting resistor. The MOSFET output
stage is biased AB for linear operation. External com-
pensation provides flexibility in choosing bandwidth
and slew rate for the application. Cirrus’s Power SIP
package uses a minimum of board space allowing for
high density circuit boards. The Power SIP package is
electrically isolated. Isolating thermal washers (TW13)
are recommended to prevent arcing from pins to heat-
sink.
EQUIVALENT SCHEMATIC
12
+V_{S R1A R1B}
C2
R3
Q1
Q2
Q6
Q5
Q5A
1
–IN ^R9
R11
6
4 ^CC2
CC1
Q5B
R10
R12
2
+IN
Q29
R20
–V_S
10
Q3
Q8
Q14
Q21
Q29
R4
Q4
ILIM
8
R7
7
OUT
Q14
R19
Q30
R27
PA95U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
JUN 20091
APEX − PA95UREVK