PA95 Datasheet, PDF (1/4 Pages) Cirrus Logic – HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER

MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA95
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX [phone]
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 amplifier
designed as a low cost solution for driving continuous 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 appropriate current limiting resistor. The
MOSFET output stage is biased AB for linear operation.
External compensation provides flexibility in choosing band-
width and slew rate for the application. APEX’s Power SIP04
package uses a minimum of board space allowing for high
density circuit boards.
EQUIVALENT SCHEMATIC
12
+V_S
R1 R2
C1
R3
Q1
Q2
Q6
Q5
6
4 ^CC2
CC1
1
–IN ^R5
R8
R6
R9
2
+IN
Q15
R11
–V_S
10
Q3
Q8
Q11
Q13
Q12
R4
Q4
ILIM
8
R7
7
OUT
Q14
R10
Q16
R12
PATENT PENDING
TYPICAL APPLICATION
Piezo positioning may be applied to the focusing of seg-
mented mirror systems. The composite mirror may be com-
posed of hundreds of elements, each requiring focusing under
computer control. In such complex systems the PA95 reduces
the costs of power supplies and cooling with its advantages of
low cost and low quiescent power consumption while increas-
ing circuit density with the SIP package.
R_F
+V_S
R _IN
COMPUTER
FOCUS
COMMAND
VOLTAGE
12
1
PA95
7
2
8
10
R _CL
PIEZO DRIVE
V _OUT
–V _S
EXTERNAL CONNECTIONS
PACKAGE SIP04
–IN +IN
12
CC1
4
CC2 OUT Ilim
6 78
–Vs
+Vs
10
12
C_c
R_LIM
*
*
* .01µF or greater ceramic power supply bypassing required.
PHASE COMPENSATION
GAIN
≥10
C_C
4.7pF
R _LIM
=
.7
I_LIM
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