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기능 POWER OPERATIONAL AMPLIFIERS
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PA12 데이터시트, 핀배열, 회로
MICROTECHNOLOGY
POWER OPERATIONAL AMPLIFIERS
PA12 • PA12A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• LOW THERMAL RESISTANCE — 1.4° C/W
• CURRENT FOLDOVER PROTECTION — NEW
• HIGH TEMPERATURE VERSION — PA12H
• EXCELLENT LINEARITY — Class A/B Output
• WIDE SUPPLY RANGE — ±10V to ±50V
• HIGH OUTPUT CURRENT — Up to ±15A Peak
APPLICATIONS
• MOTOR, VALVE AND ACTUATOR CONTROL
• MAGNETIC DEFLECTION CIRCUITS UP TO 10A
• POWER TRANSDUCERS UP TO 100kHz
• TEMPERATURE CONTROL UP TO 360W
• PROGRAMMABLE POWER SUPPLIES UP TO 90V
• AUDIO AMPLIFIERS UP TO 120W RMS
DESCRIPTION
The PA12 is a state of the art high voltage, very high output
current operational amplifier designed to drive resistive, induc-
tive and capacitive loads. For optimum linearity, especially at
low levels, the output stage is biased for class A/B operation
using a thermistor compensated base-emitter voltage multi-
plier circuit. The safe operating area (SOA) can be observed
for all operating conditions by selection of user program-
mable current limiting resistors. For continuous operation
under load, a heatsink of proper rating is recommended.
This hybrid integrated circuit utilizes thick film (cermet)
resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections at all operating temperatures. The 8-pin TO-3
package is hermetically sealed and electrically isolated. The
use of compressible isolation washers voids the warranty.
EQUIVALENT SCHEMATIC
3
D1
Q2A
Q2B
4
A1
5
C1
6
Q1
Q3
Q4 Q5
Q6B
Q6A
2
1
7
8
POWER RATING
Not all vendors use the same method to rate the power
handling capability of a Power Op Amp. APEX rates the
internal dissipation, which is consistent with rating methods
used by transistor manufacturers and gives conservative
results. Rating delivered power is highly application depen-
dent and therefore can be misleading. For example, the 125W
internal dissipation rating of the PA12 could be expressed as
an output rating of 250W for audio (sine wave) or as 440W if
using a single ended DC load. Please note that all vendors rate
maximum power using an infinite heatsink.
THERMAL STABILITY
APEX has eliminated the tendency of class A/B output
stages toward thermal runaway and thus has vastly increased
amplifier reliability. This feature, not found in most other Power
Op Amps, was pioneered by APEX in 1981 using thermistors
which assure a negative temperature coefficient in the quies-
cent current. The reliability benefits of this added circuitry far
outweigh the slight increase in component count.
EXTERNAL CONNECTIONS
R CL+
+VS
3
CL+
2
OUT
1
+IN 4
TOP VIEW
–IN 5
6
–VS
8
CL–
7
F.O.
R CL–
OUTPUT
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]




PA12 pdf, 반도체, 판매, 대치품
PA12 • PA12A
OPERATING
CONSIDERATIONS
GENERAL
Please read Application Note 1, which covers stability, supplies,
heatsinking, mounting, current limit, SOA interpretation, and speci-
fication interpretation. Additional information can be found in the
application notes. For information on the package outline, heatsinks,
and mounting hardware, consult the “Accessory and Package
Mechanical Data” section of the handbook.
SAFE OPERATING AREA (SOA)
The output stage of most power amplifiers has three distinct
limitations:
1. The current handling capability of the transistor geometry and
the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
3. The junction temperature of the output transistors.
The SOA curves combine the effect of all limits for this Power Op
15
10 THERMAL
5.0
3.0
T
C = 25°C
T
C = 85°C
2.0
1.5
T
C
= 125°C
1.0
.7
.5
SECOND BREAKDOWN
.3
10 15 20 25 30 35 40 50 60 70 80 100
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE VS –VO (V)
Amp. For a given application, the direction and magnitude of the
output current should be calculated or measured and checked
against the SOA curves. This is simple for resistive loads but more
complex for reactive and EMF generating loads. However, the
following guidelines may save extensive analytical efforts.
1. Capacitive and dynamic* inductive loads up to the following
maximum are safe with the current limits set as specified.
CAPACITIVELOAD
INDUCTIVELOAD
±VS
ILIM = 5A ILIM = 10A
ILIM = 5A ILIM = 10A
50V
200µF
125µF
5mH
2.0mH
40V
500µF
350µF
15mH 3.0mH
35V
2.0mF
850µF
50mH 5.0mH
30V
7.0mF
2.5mF
150mH 10mH
25V
25mF
10mF
500mH 20mH
20V
60mF
20mF
1,000mH 30mH
15V 150mF 60mF 2,500mH 50mH
*If the inductive load is driven near steady state conditions, allowing the output
voltage to drop more than 8V below the supply rail with ILIM = 15A or 25V below
the supply rail with ILIM = 5A while the amplifier is current limiting, the inductor
must be capacitively coupled or the current limit must be lowered to meet SOA
criteria.
2. The amplifier can handle any EMF generating or reactive load
and short circuits to the supply rail or common if the current
limits are set as follows at TC = 25°C:
SHORTTO ±VS
±VS C,L,OREMFLOAD
50V .30A
40V .58A
35V .87A
30V 1.5A
25V 2.4A
20V 2.9A
15V 4.2A
SHORTTO
COMMON
2.4A
2.9A
3.7A
4.1A
4.9A
6.3A
8.0A
These simplified limits may be exceeded with further analysis using the operat-
ing conditions for a specific application.
CURRENT LIMITING
Refer to Application Note 9, "Current Limiting", for details of both
fixed and foldover current limit operation. Visit the Apex web site
at www.apexmicrotech.com for a copy of the Power Design
spreadsheet (Excel) which plots current limits vs. steady state
SOA. Beware that current limit should be thought of as a +/–20%
function initially and varies about 2:1 over the range of –55°C to
125°C.
For fixed current limit, leave pin 7 open and use equations 1 and 2.
RCL = 0.65/LCL
ICL = 0.65/RCL
(1)
(2)
Where:
ICL is the current limit in amperes.
RCL is the current limit resistor in ohms.
For certain applications, foldover current limit adds a slope to
the current limit which allows more power to be delivered to the
load without violating the SOA. For maximum foldover slope,
ground pin 7 and use equations 3 and 4.
ICL =
0.65 + (Vo * 0.014)
RCL
(3)
RCL =
0.65 + (Vo * 0.014)
ICL
(4)
Where:
Vo is the output voltage in volts.
Most designers start with either equation 1 to set RCL for the
desired current at 0v out, or with equation 4 to set RCL at the
maximum output voltage. Equation 3 should then be used to plot
the resulting foldover limits on the SOA graph. If equation 3 results
in a negative current limit, foldover slope must be reduced. This
can happen when the output voltage is the opposite polarity of the
supply conducting the current.
In applications where a reduced foldover slope is desired, this
can be achieved by adding a resistor (RFO) between pin 7 and
ground. Use equations 4 and 5 with this new resistor in the circuit.
ICL =
0.65
+
1V0.o14*
0.14
+ RFO
RCL
RCL =
Where:
0.65
+
1V0.o14*
0.14
+ RFO
ICL
RFO is in K ohms.
(5)
(6)
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA12U REV. M MARCH 1999 © 1999 Apex Microtechnology Corp.

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