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부품번호 PA141A 기능
기능 (PA141 / PA142) HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
제조업체 Apex Microtechnology
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PA141A 데이터시트, 핀배열, 회로
www.DataSheet4U.com
MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA141/PA142 • PA141A/PA142A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• 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
8-PIN TO-3
PACKAGE STYLE CE
10-PIN SIP
PACKAGE STYLE DW
• PIEZO ELECTRIC POSITIONING
• ELECTROSTATIC TRANSDUCER & DEFLECTION
• DEFORMABLE MIRROR FOCUSING
• BIOCHEMISTRY STIMULATORS
• COMPUTER TO VACUUM TUBE INTERFACE
TYPICAL APPLICATION
Ref: APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifiers"
R 20R
20R
V IN +175
2.2K
20R
+175
2.2K
DESCRIPTION
10pF
10pF
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
A1
PA141/142 RCL
180
100
PIEZO
TRANSDUCER
R CL
A2
PA141/142
180
100
Rn
Cn
and differential mode voltages. The safe operating
330pF
330pF
area (SOA) has no second breakdown limitations and
can be observed with all type loads by choosing
an appropriate current limiting resistor. External com-
LOW COST 660V p-p
–175
PIEZO DRIVE
–175
pensation provides the user flexibility in choosing
Two PA141/PA142 amplifiers operated as a bridge driver
optimum gain and bandwidth for the application.
for a piezo transducer provides a low cost 660 volt total drive
The PA141 is packaged in a hermetically sealed TO-3
and all circuitry is isolated from the case by an aluminum
nitride (AlN) substrate.
capability. The RN CN network serves to raise the apparent
gain of A2 at high frequencies. If RN is set equal to R the
amplifiers can be compensated identically and will have
The PA142 is packaged in APEX’s hermetic ceramic matching bandwidths.
SIP package.
EXTERNAL CONNECTIONS
EQUIVALENT SCHEMATIC
R CL
PHASE
8 (6)
RC CC
COMPENSATION
D1
+VS
COMP 3
2 COMP
1 I LIM
Gain
1
10
CC
18pF
10pF
RC
2.2K
2.2K
Q1 Q2
OUT 4
30 3.3pF 2.2K
Q3 I LIM
TOP VIEW
CS
330pF
(1) 5
–IN
(2) 6
+IN
Q4 Q5
D2 D3 D4 D5
(8) 2 Q6
COMP
COMP Q8
(9) 3
Q11
Q12
Q13
Q7
Q9
Q10
Q14
5 PA141 PIN NUMBER
(1) PA142 PIN NUMBER
1 (7)
4 (10)
OUT
5
–IN
6
+IN
PA141
7
–VS
8
+VS
RS
100
CS ,CC ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
RCL =
3
I LIM
TOP VIEW
1 2 3 4 5 6 7 8 9 10
NC NC –VS +VS ILIM
CC CC OUT
RS
100
RC
–IN +IN
CS
330pf
CC
–VS PA142
7
RCL
(5) 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 [email protected]
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PA141A pdf, 반도체, 판매, 대치품
PA141/PA142 • PA141A/PA142A
OPERATING
CONSIDERATIONS
GENERAL
Please read Application Note 1 “General Operating
Considerations” which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.apexmicrotech.com for design tools
that help automate tasks such as calculations for stability,
internal power dissipation, current limit; heat sink selection;
Apex’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
CURRENT LIMIT
For proper operation the current limit resistor, RCL, must be
connected as shown in the external connection diagram. The
minimum value is 18 ohms, however for optimum reliability
the resistor value should be set as high as possible. The
value can be estimated as follows with the maximum practical
value of 500 ohms.
RCL = 3
ILIM
Use the typical performance graphs as a guide for expected
variations in current limit value with a given RCL and variations
over temperature. The selected value of RCL must be added
to the specified typical value of output resistance to calculate
the total output resistance. Since the load current passes
through RCL the value selected also affects the output voltage
swing according to:
VR = IO * RCL
where VR is the voltage swing reduction.
When the amplifier is current limiting, there may be
small signal spurious oscillation present during the current
limited portion of the negative half cycle. The frequency
of the oscillation is not predictable and depends on the
compensation, gain of the amplifier, and load. The oscillation
will cease as the amplifier comes out of current limit.
INPUT PROTECTION
The PA141/142 inputs are protected against common mode
voltages up the supply rails and differential voltages up to
±16 volts as well as static discharge. Differential voltages
exceeding 16 volts will be clipped by the protection circuitry.
However, if more than a few milliamps of current is available
from the overload source, the protection circuitry could be
destroyed. The protection circuitry includes 300 ohm current
limiting resistors at each input, but this may be insufficient
for severe overloads. It may be necessary to add external
resistors to the application circuit where severe overload
conditions are expected. Limiting input current to 1mA will
prevent damage.
STABILITY
The PA141/142 has sufficient phase margin when
compensated for unity gain to be stable with capacitive loads
of at least 10 nF. However, the low pass circuit created by the
sumpoint (–in) capacitance and the feedback network may
add phase shift and cause instabilities. As a general rule,
the sumpoint load resistance (input and feedback resistors
in parallel) should be 5K ohm or less at low gain settings
(up to 10). Alternatively, use a bypass capacitor across
the feedback resistor. The time constant of the feedback
resistor and bypass capacitor combination should match
the time constant of the sumpoint resistance and sumpoint
capacitance.
The PA141/142 is externally compensated and performance
can be tailored to the application. Use the graphs of small
signal gain and phase response as well as the graphs for
slew rate and power response as a guide. The compensation
capacitor CC must be rated at 350V working voltage.
The compensation capacitor and associated resistor RC
must be mounted closely to the amplifier pins to avoid
spurious oscillation. An NPO capacitor is recommended
for compensation.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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