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參數(shù)資料
| 型號： | ISO256 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Precision, Powered, Three-Port Isolated Operational Amplifier(精密、三端口隔離緩沖放大器(帶變壓器）) |
| 中文描述： | 精密，技術(shù)支持，三端口隔離運(yùn)算放大器（精密，三端口隔離緩沖放大器（帶變壓器）） |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 160K |
| 代理商： | ISO256 |
6
ISO256
resistors and diode clamps. The inputs can withstand
±
30V
differential inputs without damage. The protection diodes
will of course conduct current when the inputs are over-
driven. This may disturb the slewing rate in unity gain
follower applications, but will not damage the op-amp.
DC/DC CONVERTER
ISO256 provides a reliable solution to the need for integral
power. The high isolation rating being achieved by careful
design and attention to the physical construction of the
transformer. In addition to the high dielectric strength a low
leakage coating increases the isolation voltage range. The
soft start oscillator/driver design eliminates high inrush
currents during turn-on. Input current sensing protects both
the converter and the load from possible thermal damage
during a fault condition. The DC/DC converter is synchro-
nized to the amplifier and when multiple ISO256’s are used,
each channel can be synchronized via the SYNC pin.
The DC/DC converter consists of a free-running oscillator,
control and switch driver circuitry, MOSFET switches, a
transformer, rectifier diodes and filter capacitors all con-
tained within the ISO256 package. The control circuitry
consists of current limiting, soft start and synchronization
features. In instances where several ISO256’s are used in a
system, beat frequencies developed between the ISO256’s
are a potential source of low frequency noise in the supply
and ground paths. This noise may couple into the signal path
BASIC OPERATION
ISO256 is a precision, powered, three-port isolated ampli-
fier. The input and output sections are galvanically isolated
by matched and EMI shielded capacitors built into the
plastic package. The DC/DC converter input is also galvani-
cally isolated from both the input and output supplies.
SIGNAL AND POWER CONNECTIONS
Figure 1 shows proper power and signal connections. The
power supply input pin +V
S3
should be bypassed with a
2.2
μ
F tantalum capacitor and the outputs V
S1
and V
S2
with
220nF ceramic capacitors located as close to the amplifier as
possible. All ground connections should be run indepen-
dently to a common point. Signal Common on both input
and output sections provide a high-impedance point for
sensing signal ground in noisy applications. Com1 and
Com2 must have a path to ground for bias current return and
should be maintained within
±
1V of GND1 and GND2
respectively.
INPUT COMMON-MODE RANGE
The linear common-mode range of the input circuitry of the
ISO256 is approximately
±
11V.
INPUT PROTECTION
The inputs of the ISO256 are protected with 500
series
FIGURE 1. Basic Connections.
220nF
220nF
2.2μF
+V
S1
–V
S1
GND1
Com1
+V
IN
28
26
4
G = 1 +
R
FB
R
IN
27
25
+V
S2
–V
S2
GND2
Com2
12
V
OUT
13
11
10
V
OUT
14
+15V
OUT
–15V
OUT
220nF
220nF
+15V
OUT
–15V
OUT
ISO256
OPA
MOD
FB
1
2
SYNC
GND3
+V
S3
16
17
15
SYNC
+15V
–V
IN
3
V
IN
R
FB
R
IN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISO256P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-ISOLATION OP AMP |
| ISO3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC |
| ISO3080 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ISOLATED 5-V FULL AND HALF-DUPLEX RS-485 TRANSCEIVERS |
| ISO3080_09 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ISOLATED 5-V FULL AND HALF-DUPLEX RS-485 TRANSCEIVERS |
| ISO3080_10 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ISOLATED 5-V FULL AND HALF-DUPLEX RS-485 TRANSCEIVERS |
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