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參數資料
型號: 3652
元件分類: 隔離放大器
英文描述: Optically-Coupled Linear ISOLATION AMPLIFIERS
中文描述: 光耦合線性隔離放大器
文件頁數: 2/13頁
文件大?。?/td> 127K
代理商: 3652
10
3650/52
APPLICATIONS
Figure 8 shows a system where isolation amplifiers (3650)
are used to measure the armature current and the armature
voltage of a motor.
The armature current of the motor is converted to a voltage
by the calibrated shunt RS and then amplifier (adjustable
gain) and isolated by the 3650.
The armature voltage is sensed by the voltage divider (ad-
justable) shown and then amplified and isolated by the 3650.
The 3650 provides the advantage of accurate current mea-
surement in the presence of high common-mode voltage.
Both 3650s provide the advantage of isolating the motor
ground from the control system ground. Isolated power is
provided by an isolated DC/DC converter (BB Model 722 or
equivalent).
The 3652 is ideally suited for patient monitoring applica-
tions as shown in Figure 9. The fact that it is a true balanced
input instrumentation amplifier with very high differential
and common-mode impedance means that it can greatly
reduce the common-mode noise pick up due to imbalance in
lead impedances that often appear in patient monitoring
situations. The 3kV and 6kV shown in Figure 9 are the 10ms
pulse ratings of the +IR and –IR inputs for the common-mode
and differential input voltages with respect to input com-
mon. The rating of the isolation barrier is 2000Vpk continu-
FIGURE 8. Isolated Armature Current and Voltage Sensor.
P+
V–
+V
O
3650HG
11
10
12
20
4.99k
+V
CC
23
G = 1V/V
To
Voltage
Sense
C
–V
O
722
1.3k
E
V+
1M
4.99k
500
9.76k
14
13
17
26
–V
CC
O/P Com
+V
–V
I/O Com
3650JG
11
10
20
4.75k
23
4.99k
14
12
13
+V
–V
I/O
Com
V
A/100
To
Current
Sense
17 O/P Com
100V
S
26
+V
CC
–V
CC
+15VDC
–15VDC
O/P Com
G = 100V/V
500
Motor
Control
V
A
(500V)
V
S
(100mV)
R
S
V
OUT
+
+
V
CM
CMRR
IMRR
COMMON-MODE AND
ISOLATION-MODE REJECTION
The expression for the output error due to common-mode
and isolation mode voltage is:
VOUT = G
+
GUARDING AND PROTECTION
To preserve the excellent inherent isolation characteristics of
these amplifiers, the following recommended practice should
be noted.
1. Use shielded twisted pair of cable at the input as with
any instrumentation amplifier.
2. Care should be taken to minimize external capacitance.
A symmetrical layout of external components to achieve
balanced capacitance from the input terminals to output
common will preserve high IMR.
3.
External components and conductor patterns should be
at a distance equal to or greater than the distance
between the input and output terminals to prevent HV
breakdown.
4.
Though not an absolute requirement, the use of lamin-
ated or conformally coated printed circuit boards is
recommended.
V
ISO
相關PDF資料
PDF描述
3656AG Transformer Coupled ISOLATION AMPLIFIER
3656BG Transformer Coupled ISOLATION AMPLIFIER
3656 Transformer Coupled ISOLATION AMPLIFIER
380-90-102-00-001000 SIP2, IC SOCKET
380-40-151-00-001000 SIP51, IC SOCKET
相關代理商/技術參數
參數描述
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