HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA141/PA142 • PA141A/PA142A
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—CPA141
APPLICATIONS
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PIEZO ELECTRIC POSITIONING
ELECTROSTATIC TRANSDUCER & DEFLECTION
DEFORMABLE MIRROR FOCUSING
BIOCHEMISTRY STIMULATORS
COMPUTER TO VACUUM TUBE INTERFACE
8-PIN TO-3
PACKAGE STYLE CE
TYPICAL APPLICATION
20R
+175
2.2K
10pF
A1
PA141/142
10-PIN SIP
PACKAGE STYLE DW
Ref: APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifiers"
R
V
IN
20R
20R
+175
2.2K
10pF
A2
R
CL
PIEZO
180 TRANSDUCER 180
100
Ω
100
Ω
330pF
330pF
R
CL
PA141/142
DESCRIPTION
The PA141/PA142 are high voltage monolithic MOSFET
operational 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 com-
pensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.
The PA141 is packaged in a hermetically sealed TO-3
and all circuitry is isolated from the case by an aluminum
nitride (AlN) substrate.
The PA142 is packaged in APEX’s hermetic ceramic
SIP package.
Rn
Cn
–175
LOW COST 660V p-p
PIEZO DRIVE
–175
Two PA141/PA142 amplifiers operated as a bridge driver
for a piezo transducer provides a low cost 660 volt total drive
capability. 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
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)
5
8 (6)
+V
S
PHASE
COMPENSATION
I
LIM
OUT
4
Gain
1
10
30
C
S
330pF
C
C
18pF
10pF
3.3pF
R
C
2.2K
2.2K
2.2K
TOP VIEW
–IN
6
8
+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
Q9
PA141
1
2
3
NC
4
TOP VIEW
5
6
+V
S
I
LIM
R
S
100Ω
C
S
330pf
7
8
C
C
R
C
9
C
C
10
OUT
Q10
Q14
–V
S
7
(5)
–IN
+IN
NC –V
S
C
C
R
CL
PA142
5
PA141 PIN NUMBER
(1) PA142 PIN NUMBER
NOTE:
PA141 Recommended mounting torque is 4-7 in•lbs
(.45 -.79 N•m)
CAUTION:
The use of compressible, thermally conductive
insulators may void warranty.
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
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