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PA45 데이터시트 PDF




ETC에서 제조한 전자 부품 PA45은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 PA45 기능
기능 HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
제조업체 ETC
로고 ETC 로고


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PA45 데이터시트, 핀배열, 회로
MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIER
PA45
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• MONOLITHIC MOS TECHNOLOGY
• LOW COST
• HIGH VOLTAGE OPERATION—150V
• HIGH SLEW RATE—27V/µs
• HIGH POWER—5A, 85W DISSIPATION
APPLICATIONS
• MAGNETIC DEFLECTION
• PA AUDIO
• MOTOR DRIVE
• NOISE CANCELLATION
DESCRIPTION
The PA45 is a high power monolithic MOSFET operational
amplifier that achieves performance levels unavailable even in
many hybrid amplifier designs. Inputs are protected from
excessive common mode and differential mode voltages as
well as static discharge. 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.
This circuit utilizes a beryllia (BeO) substrate to minimize
thermal resistance. Ultrasonically bonded aluminum wires
provide reliable interconnections at all operating tempera-
tures. The 8-pin TO-3 package is hermetically sealed and
electrically isolated. The use of compressible isolation wash-
ers and/or improper mounting torque will void the product
warranty.
EQUIVALENT SCHEMATIC
PATENTED
TYPICAL APPLICATION
+80
RC CC
3
VI
42
7 8 RCL
RI
PA45
51
6
–20
CF
RD
RF
YOKE
±2.5A 7µSec Retrace
Horizontal Deflection Coil Amplifiers
RS
Horizontal deflection amplifiers require both high speed and
low distortion. The speed at which current can be changed in a
deflection coil is a function of the voltage available from the op
amp. In this application an 80 volt power supply is used for the
retrace polarity to provide a 7 µSec retrace time, half of which is
required for amplifier slewing. This circuit can perform 15.75
KHz deflection in up to 50µH coils at up to 5A p-p.
3
+VS
D1
Q24
Q3
D2
D4
D3
–IN D5
5
Q11
Q12
4
+IN
Q20 Q21
Q8
CC1
2
Q13
7 CC2
–VS D7
6
EXTERNAL CONNECTIONS
Q2
Q5 Q6
Q9
Q7 OUTPUT
DRIVE
Q10 8
1
Q14 Q15 CURRENT
SENSE
Q16
Q17
Q19
+VS
CC1
2
3
CURRENT
SENSE
1
OUTPUT
+IN 4
CC
TOP VIEW
R CL
RC 5
–IN
8
6
–VS
7
CC2
OUTPUT
DRIVE
CC IS NPO RATED
FOR FULL SUPPLY VOLTAGE.
PHASE
COMPENSATION
Gain
CC
RC
10 10pF 1K
1 68pF 1K
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]




PA45 pdf, 반도체, 판매, 대치품
PA45
OPERATING
CONSIDERATIONS
GENERAL
Please read the General Operating Considerations section,
which covers stability, supplies, heat-sinking, mounting, cur-
rent limit, SOA interpretation, and specification interpretation.
Additional information can be found in the application notes.
For information on the package outline, heatsink, and mount-
ing hardware, consult the “Accessories Information” and “Pack-
aging” mechanical data section of the data book.
CURRENT LIMIT
Current limiting is achieved by developing 0.83V on the
amplifiers current sense circuit by way of an internal tie to the
output drive (pin 8) and an external current sense line (pin 1).
A sense resistor RCL is used to relate this sense voltage to a
current flowing from output drive.
RCL =
0.83 – 0.05 * ICL
ICL
ICL =
0.83
RCL + 0.05
with a maximum practical value of 16. RCL is added to the
typical value of output resistance and affects the total possible
swing since it carries the load current. The swing reduction, VR
can be established VR = IOUT * RCL.
INPUT PROTECTION
The PA45 inputs are protected against common mode
voltages up to the supply rails, differential voltages up to ±16
volts and 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 input
drive source, the protection circuitry could be destroyed. The
protection circuitry includes 300 ohm current limiting resistors
at each input. This security may be insufficient for severe
overdrive of the input. Adding external resistors to the applica-
tion which limits severe input overdrive current to 1mA, will
prevent damage.
STABILITY
The PA45 has sufficient phase margin when compensated
for unity gain to be stable with capacitive loads of at least 10nF.
However, the low pass circuit created by the sum-point (–in)
capacitance and the feedback network may add phase shift
and cause instabilities. As a rule, the sum-point load resis-
tance (input and feedback resistors in parallel) should be 1k
ohm or less. 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 sum-point resistance and sum-point capaci-
tance.
The PA45 is externally compensated and performance can
be tailored to the application. The compensation network CC-
RC must be mounted closely to the amplifier pins 7 and 2 to
avoid noise coupling to these high impedance nodes.
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier has limitations from its channel temperature.
NOTE: The output is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
SAFE OPERATING AREA
6.0
4.0
2.0 DC, T DC 2001m0S0mS
1.0 DC, T C = 85°C
0.8
0.6
C = 125°C
0.4
0.2
PULSE CURVES @ 10% DUTY CYCLE MAX
0.1
4 6 8 10 20 40 60 100
200
SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)
AThPiEs XdatMa IshCeRetOhTaEsCbHeeNn OcaLreOfuGllYy cCheOcRkePdOanRdAiTs IbOelNieved t5o9b8e0relNiaOblRe,ThHowSeHveAr,NnNo OreNspoRnOsiAbiDlityisTaUssCumSOedNf,orApRosIsZibOleNiAnac8c5ur7ac4i1es or oUmSiAssionsA. APlPl sLpIeCciAfiTcaItOioNnSs aHreOsuTbLjIecNtEto: c1ha(n8ge00w)ith5ou4t6n-o2ti7c3e.9
PA45U REV. B FEBRUARY 1998 © 1998 Apex Microtechnology Corp.

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