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參數(shù)資料
| 型號： | ISO256 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 150K |
| 代理商： | ISO256 |
6
ISO253
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 ISO253’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 ISO253 package. The control circuitry
consists of current limiting, soft start and synchronization
features. In instances where several ISO253’s are used in a
system, beat frequencies developed between the ISO253’s
are a potential source of low frequency noise in the supply
and ground paths. This noise may couple into the signal path
and can be avoided by synchronizing the individual ISO253’s
together by tying the SYNC pins together or using the circuit
in Figure 2 to drive the SYNC pins from an external source.
When connecting up to eight ISO253’s without a driver the
unit with the highest natural frequency will determine the
synchronized running frequency. The SYNC pin is sensitive
to capacitive loading: 150pF or less is recommended. If
unused, the SYNC pin should be left open. Avoid shorting
the SYNC pin directly to ground or supply potentials;
otherwise damage may result.
BASIC OPERATION
ISO253 is a precision, powered, three-port isolated buffer
amplifier. 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
galvanically isolated from both the input and output sup-
plies.
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 signal current returns
and should be maintained within
±
1V of GND1 and GND2
respectively.
INPUT PROTECTION
The input of the buffer amplifier is protected for voltages up
to
±
100V. The input is a 200k
resistor to the summing
node of the input amplifier.
DC/DC CONVERTER
ISO253 provides a reliable solution to the need for integral
FIGURE 1. Basic Connections.
220nF
220nF
2.2μF
+V
S1
–V
S1
GND1
Com1
+V
IN
28
26
1
G = 1
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
ISO253
BUF
SYNC
GND3
+V
S3
16
17
15
SYNC
+15V
V
IN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISO256P | IC-ISOLATION OP AMP |
| ISO253 | Precision, Powered, Three-Port Isolated Buffer Amplifier(精密、三端口隔離緩沖放大器(帶變壓器）) |
| ISO254P | Precision, Powered, Three-Port Isolated PROGRAMMABLE GAIN AMPLIFIER |
| ISO254 | Precision, Powered, Three-Port Isolated PROGRAMMABLE GAIN AMPLIFIER |
| ISO255P | Precision, Powered, Three-Port Isolated INSTRUMENTATION AMPLIFIER |
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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