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PA76A 参数 Datasheet PDF下载

PA76A图片预览
型号: PA76A
PDF下载: 下载PDF文件 查看货源
内容描述: 功率双路运算放大器 [Power Dual Operational Amplifiers]
分类和应用: 运算放大器
文件页数/大小: 5 页 / 206 K
品牌: CIRRUS [ CIRRUS LOGIC ]
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PA74,
Product
I n n o v a o n
o v a t i o
PA76A
Produc nn
PA76,
t i
I
PA74A,
n F r o m
From
PA74/PA76 • PA74A/76A
PA74/76 • PA74A/76A
Power Dual Operational Amplifiers
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
• LOW DISTORTION
8-PIN TO-3
PACKAGE STYLE CE
R2
+28V 9K
_
A
+
COMMAND
INPUT
0/10V
1/2 PA74
R3
10K
R4
10K
_
+28V
R5
10K
R6
10K
APPLICATIONS
• HALF & FULL BRIDGE MOTOR DRIVERS
• AUDIO POWER AMPLIFIER
STEREO — 30W RMS per channel
BRIDGE — 60W RMS per package
• IDEAL FOR SINGLE SUPPLY SYSTEMS
5V — Peripherals, 12V — Automotive
28V — Avionic
R1
5K
M
1/2 PA74
B
+
FIGURE 1: BIDIRECTIONAL
SPEED CONTROL FROM A
SINGLE SUPPLY.
DESCRIPTION
The amplifier design consists of dual monolithic input and output
stages to achieve the desired input and output characteristics
of the PA74 and PA76. The input stage utilizes a dual power op
amp on a single chip monolithic that drives the output stages.
The output stages are configured in a non inverting unity gain
buffer configuration. The output stages of the amplifier are also
compensated for stability. The PA74 and PA76 dual amplifiers are
designed with both monolithic and hybrid technologies providing
a cost effective solution for applications requiring multiple ampli-
fiers per board or bridge mode configurations. Both amplifiers
are internally compensated but are not recommended for use
as unity gain followers.
This dual hybrid circuit utilizes a beryllia (BeO) substrate, thick
film resistors, ceramic capacitors and monolithic amplifiers to
maximize reliability and power handling capability, minimize size
and give top performance. Ultrasonically bonded aluminum wires
provide reliable 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.
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.
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 0.714V to 9.286V 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.
EQUIVALENT SCHEMATIC
ONE CHANNEL
+V
S
I BIAS
MONITOR
CURRENT
GAIN
EXTERNAL CONNECTIONS
(TOp viEws)
PA74
–IN, A
4
3
+V
S
2
OUT, A
1
PA76
+IN, A
3
–IN, A
4
+V
S
2
OUT, B
1
A
-IN
+IN
THERMAL
PROTECT
+IN, A
OUT
A
+
+
B
CURRENT
GAIN
5
+IN, B
–IN, B
6
B
8
OUT, B
5
OUT, A
–V
S
6
-V
S
7
–V
S
7
+IN, B
8
–IN, B
PA74-76U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009
1
APEX − PA74-76UREVE