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PA21A 데이터시트 PDF




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기능 POWER DUAL OPERATIONAL AMPLIFIERS
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PA21A 데이터시트, 핀배열, 회로
MICROTECHNOLOGY
POWER DUAL OPERATIONAL AMPLIFIERS
PA21/25/26 • PA21A/25A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• LOW COST
• WIDE COMMON MODE RANGE —
Includes negative supply
• WIDE SUPPLY VOLTAGE RANGE
Single supply: 5V to 40V
Split supplies: ±2.5V to ±20V
• HIGH EFFICIENCY — |Vs–2.2V| at 2.5A typ
• HIGH OUTPUT CURRENT — 3A min (PA21A)
• INTERNAL CURRENT LIMIT
• LOW DISTORTION
APPLICATIONS
• HALF & FULL BRIDGE MOTOR DRIVERS
• AUDIO POWER AMPLIFIER
STEREO — 18W RMS per channel
BRIDGE — 36W RMS per package
• IDEAL FOR SINGLE SUPPLY SYSTEMS
5V — Peripherals
12V — Automotive
28V — Avionic
DESCRIPTION
The amplifiers consist of a monolithic dual power op amp
in a 8-pin hermetic TO-3 package (PA21 and PA25) and a 12-
pin SIP package (PA26). Putting two power op amps in one
package and on one die results in an extremely cost effective
solution for applications requiring multiple amplifiers per
board or bridge mode configurations.
The wide common mode input range includes the negative
rail, facilitating single supply applications. It is possible to
have a “ground based” input driving a single supply amplifier
with ground acting as the “second” or “bottom” supply of the
amplifier.
The output stages are also well protected. They possess
internal current limit circuits. While the device is well pro-
tected, the Safe Operating Area (SOA) curve must be ob-
served. Proper heatsinking is required for maximum reliabil-
ity.
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.
The tab of the SIP12 plastic package is tied to –VS.
R2 R3
9K
+28V
10K
R4
R1
10K
5K A M B
++
1/2 PA21
1/2 PA21
COMMAND
INPUT
0/10V
+28V
R5
10K
R6
10K
FIGURE 1: BIDIRECTIONAL SPEED CONTROL FROM
A SINGLE SUPPLY
The amplifiers are especially well-suited for this application.
The extended common mode range allows command inputs
as low as 0V. Its superior output swing abilities let it drive within
2V of supply at an output current of 2A. This means that a
command input that ranges from 0V to 10V will drive a 24V
motor from full scale CCW to full scale CW at up to ±2A. A
single power op amp with an output swing capability of Vs –6
would require ±30V supplies and would be required to swing
48V p-p at twice the speed to deliver an equivalent drive.
EXTERNAL CONNECTIONS
PA26
Connect pins
3 and 10 to pin 7
and connect pins
4 and 9 to pin 6
unless special
functions are re-
quired.
++
A
SUB B
1 2 3 4 5 6 7 8 9 10 11 12
TYPICAL APPLICATION
R1 and R2 set up amplifier A in a non-inverting gain of 2.8.
Amp B is set up as a unity gain inverter driven from the output
of amp A. Note that amp B inverts signals about the reference
node, which is set at mid-supply (14V) by R5 and R6. When the
command input is 5V, the output of amp A is 14V. Since this is
equal to the reference node voltage, the output of amp B is also
14V, resulting in 0V across the motor. Inputs more positive
than 5V result in motor current flow from left to right (see Figure
1). Inputs less positive than 5V drive the motor in the opposite
direction.
+IN, A
3
IN, A
+VS
2 OUT, B
1
4
+
AB
+
5
OUT, A TOP VIEW
8
VS 6
PA25
7
+IN, B
IN, B
IN, A 3
4
+IN, A
5
+IN, B
6
IN, B
PA21
+VS
2
A
B
7
VS
OUT, A
1
8
OUT, B
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]




PA21A pdf, 반도체, 판매, 대치품
PA21/25/26 PA21A/25A
OPERATING
CONSIDERATIONS
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, supplies, heat sinking, mount-
ing, current limit, SOA interpretation, and specification inter-
pretation. Visit www.apexmicrotech.com for design tools that
help automate tasks such as calculations for stability, internal
power dissipation, current limit and heat sink selection. The
"Application Notes" and "Technical Seminar" sections contain
a wealth of information on specific types of applications.
Package outlines, heat sinks, mounting hardware and other
accessories are located in the "Packages and Accessories"
section. Evaluation Kits are available for most Apex product
models, consult the "Evaluation Kit" section for details. For the
most current version of all Apex product data sheets, visit
www.apexmicrotech.com.
4
3
2
1
EACH,EBAOCTHH, OLONAEDLEODADED
TC = 25°C
.1
1
2 3 4 56
10
20 30 40 50
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE VS VO (V)
CURRENT LIMIT
Current limit is internal to the amplifier, the typical value is
shown in the current limit specification.
SAFE OPERATING AREA (SOA)
The SOA curves combine the effect of all limits for this power
op 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. The following guidelines may save extensive analytical
efforts.
Under transient conditions, capacitive and dynamic* induc-
tive loads up to the following maximum are safe:
±Vs CAPACITIVE LOAD INDUCTIVE LOAD
20V 200µF
15V 500µF
10V 5mF
5V 50mF
7.5mH
25mH
35mH
150mH
* If the inductive load is driven near steady state conditions,
allowing the output voltage to drop more than 6V below the
supply rail while the amplifier is current limiting, the inductor
should be capacitively coupled or the supply voltage must be
lowered to meet SOA criteria.
NOTE: For protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
MONOLITHIC AMPLIFIER
STABILITY CONSIDERATIONS
All monolithic power op amps use output stage topologies
that present special stability problems. This is primarily due to
non-complementary (both devices are NPN) output stages
with a mismatch in gain and phase response for different
polarities of output current. It is difficult for the op amp manu-
facturer to optimize compensation for all operating conditions.
The recommended R-C network of 1 ohm in series with
0.1µF from output to AC common (ground or a supply rail, with
adequate bypass capacitors) will prevent local output stage
oscillations.
This network is provided internally on the PA21 but must be
supplied externally on the PA25 and PA26. The amplifiers are
internally compensated for unity gain stability, no additional
compensation is required.
THERMAL CONSIDERATIONS
Although R θJC is the same for PA21/25/26 there are differ-
ences in the thermal interface between case and heatsink
which will limit power dissipation capability. Thermal grease or
an Apex TW03 thermal washer, R θCS = .1-.2°C/W, is the only
recommended interface for the PA21/25. The PA26 may
require a thermal washer which is electrically insulating since
the tab is tied to VS. This can result in thermal impedances for
R θCS of up to 1°C/W or greater.
VBOOST
+VS
IN +IN OUT
ISENSE
RS
VS
FIGURE 2. PA26 EQUIVALENT SCHEMATIC (ONE CHANNEL)
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739

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