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參數(shù)資料
| 型號： | PA228A |
| 英文描述： | Operational Amplifier |
| 中文描述： | 運算放大器 |
| 文件頁數(shù)： | 1/5頁 |
| 文件大小： | 69K |
| 代理商： | PA228A |
APEX MICROTECHNOLOGY CORPORATION
TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
FEATURES
LOW COST
WIDE COMMON MODE RANGE —
Includes negative supply
WIDE SUPPLY VOLTAGE RANGE
Single supply: 5V to 40V–to 44V,A Grade
Split supplies:
±
2.5V to
±
20V–to
±
22V,A Grade
HIGH EFFICIENCY — |Vs–2.2V| at 2.5A typ
HIGH OUTPUT CURRENT — 2.5A min,
3.5A min for A grade
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 (PA28) and a 12-pin SIP
package (PA29). 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.
This hybrid integrated circuit utilizes semiconductor chips
to maximize reliability, minimize size and give top perfor-
mance. Ultrasonically bonded aluminum wires provide reli-
able interconnections 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 –V
S
.
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.
EXTERNAL CONNECTIONS
PA28
PA29
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.
A
B
1
2
3
4
5
6
7
8
–
IN, B
+V
S
+IN, A
–
IN, A
OUT, A
–
V
S
+IN, B
OUT, B
TOP VIEW
–
+
–
+
A
B
M
R2
9K
R3
10K
R4
10K
+28V
1/2 PA28
R1
5K
COMMAND
INPUT
0/10V
1/2 PA28
+28V
R5
10K
R6
10K
+
–
+
–
FIGURE 1: BIDIRECTIONAL SPEED CONTROL FROM
A SINGLE SUPPLY
Connect pins
3 and 10 to pin 7
and connect pins
4 and 9 to pin 6
unless special
functions are re-
quired.
–
+
SUB
+
–
I
V
B
/
S
I
S
/
–
V
S
O
–
V
S
+
S
O
I
S
/
–
V
S
V
B
/
S
–
I
+
–
+
1
2
3
4
5
6
7
8
9
10
11
12
A
B
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
M I C R O T E C H N O L O G Y
POWER DUAL OPERATIONAL AMPLIFIERS
PA28/29 PA28A/29A
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