HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA41/PA42 • PA41A/PA42A
M I C R O T E C H N O L O G Y
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
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MONOLITHIC MOS TECHNOLOGY
LOW COST
HIGH VOLTAGE OPERATION—350V
LOW QUIESCENT CURRENT—2mA
NO SECOND BREAKDOWN
HIGH OUTPUT CURRENT—120 mA PEAK
AVAILABLE IN DIE FORM—PA41DIE
TYPICAL APPLICATION
R
V
IN
20R
+175
2.2K
10pF
A1
PA41/42
R
CL
10pF
A2
PA41/42
2.2K
20R
20R
+175
APPLICATIONS
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PIEZO ELECTRIC POSITIONING
ELECTROSTATIC TRANSDUCER & DEFLECTION
DEFORMABLE MIRROR FOCUSING
BIOCHEMISTRY STIMULATORS
COMPUTER TO VACUUM TUBE INTERFACE
R
CL
Rn
Cn
DESCRIPTION
The PA41/42 are high voltage monolithic MOSFET opera-
tional amplifiers achieving performance features previously
found only in hybrid designs while increasing reliability. Inputs
are protected from excessive common mode and differential
mode voltages. The safe operating area (SOA) has no second
breakdown limitations and can be observed with all type loads
by choosing an appropriate current limiting resistor. External
compensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.
The PA41 is packaged in a hermetically sealed TO-3 and all
circuitry is isolated from the case by an aluminum nitride (AlN)
substrate.
The PA42 is packaged in APEX’s hermetic ceramic SIP10
package.
PIEZO
180 TRANSDUCER 180
100
Ω
100
Ω
330pF
330pF
–175
LOW COST 660V p-p
PIEZO DRIVE
–175
Two PA41/42 amplifiers operated as a bridge driver for a
piezo transducer provides a low cost 660 volt total drive capa-
bility. The R
N
C
N
network serves to raise the apparent gain of A2
at high frequencies. If R
N
is set equal to R the amplifiers can be
compensated identically and will have matching bandwidths.
EXTERNAL CONNECTIONS
R
CL
R
C
COMP
3
C
C
2
COMP
1
PHASE
COMPENSATION
I
LIM
EQUIVALENT SCHEMATIC
D1
Q1
Q2
Q3
Q4
(1) 5
–IN
D2
(2) 6
+IN
Q11
Q12
Q13
D3
D4
D5
Q5
(8) 2 Q6
COMP
COMP Q8
(9) 3
Q7
4 (10)
OUT
I
LIM
1 (7)
8 (6)
+V
S
OUT
4
Gain
1
≥10
≥30
C
S
330pF
C
C
18pF
10pF
3.3pF
R
C
2.2KΩ
2.2KΩ
2.2KΩ
TOP VIEW
5
–IN
6
8
PA41
PA42
+IN
–V
S
7
+V
S
R
S
100
Ω
C
S
, C
C
ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
R
CL
=
3
I
LIM
TOP VIEW
1
2
3
NC
4
5
6
+V
S
I
LIM
R
S
100Ω
C
S
330pf
7
8
C
C
R
C
9
C
C
10
OUT
Q9
NC –V
S
Q10
–IN
Q14
–V
S
7
(5)
+IN
C
C
R
CL
5
PA41 PIN NUMBER
NOTE:
PA41 Recommended mounting torque is 4-7 in•lbs
(.45 -.79 N•m)
CAUTION:
The use of compressible, thermally conductive
insulators may void warranty.
(1) PA42 PIN NUMBER
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
APEX [ CIRRUS LOGIC ]
