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參數(shù)資料
| 型號： | ISO107 |
| 元件分類： | 隔離放大器 |
| 英文描述： | High-Voltage, Internally Powered ISOLATION AMPLIFIER |
| 中文描述： | 高電壓，內(nèi)部隔離放大器技術(shù) |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 119K |
| 代理商： | ISO107 |
7
ISO107
verse proportion to the increase in gain. In most instances, a
precision gain block at the input of the isolation amplifier
will provide better overall performance.
Figure 3 shows a method for trimming V
of the ISO107.
This circuit may be applied to either Signal Com (input or
output) as desired for safety or convenience. With the values
shown,
±
15V supplies and unity gain, the circuit will pro-
vide
±
150mV adjustment range and 0.25mV resolution with
a typical trim potentiometer. The output will have some
sensitivity to power supply variations. For a
±
100mV trim,
power supply sensitivity is 8mV/V at the output.
ISOLATION BARRIER VOLTAGE
The typical performance of the ISO107 under conditions of
barrier voltage stress is indicated in the first two perform-
ance curves—Recommended Range of Isolation Voltage
and IMR/Leakage vs Frequency. At low barrier modulation
levels, errors can be determined by the IMRR characteristic.
At higher barrier voltages, typical performance is obtained
as long as the dv/dt across the barrier is below the shaded
area in the first curve. Otherwise, the signal channel will be
interrupted, causing the output to distort, and/or shift DC
level. This condition is temporary, with normal operation
resuming as soon as the transient subsides. Permanent dam-
age to the integrated circuits occurs only if transients exceed
20kV/
μ
s. Even in this extreme case, the barrier integrity is
assured.
HIGH VOLTAGE TESTING
The ISO107 was designed to reliably operate with 2500Vrms
continuous isolation barrier voltage. To confirm barrier
integrity, a two-step breakdown test is performed on 100%
of the units. First, an 8000V peak, 60Hz barrier potential is
applied for 10s to verify that the dielectric strength of the
insulation is above this level. Following this exposure, a
2500Vrms, 60Hz potential is applied for one minute to
conform to UL544. Life-test results show reliable operation
under continuous rated voltage and maximum operating
temperature conditions.
OPTIONAL OUTPUT FILTER
Figure 4 shows an optional output ripple filter that reduces
the 800kHz ripple voltage to <3mVp-p without compromis-
ing DC performance. The small signal bandwidth is ex-
tended above 30kHz as a result of this compensation.
FIGURE 3. V
OS
Adjust.
+V or +V
100k
10k
1M
Signal Com 1
or
Signal Com 2
–V or –V
MULTICHANNEL SYNCHRONIZATION
Synchronization of multiple ISO107s can be accomplished
by connecting pin 19 of each device to an external TTL level
oscillator, as shown in Figure 6. The PWS750-1 oscillator is
convenient because its nominal synchronizing output fre-
quency is 1.6MHz, resulting in a 800kHz carrier in the
ISO107 (its nominal unsynchronized value). The open col-
lector output typically switches 7.5mA to a 0.2V low level
so that the external pull-up resistor can be chosen for
different pull-up voltages as shown in Figure 6. The number
of channels synchronized by one PWS750-1 is determined
by the total capacitance of the sync voltage conductors. They
must be less than 1000pF to ensure TTL level switching at
800kHz. At higher frequencies the capacitance must be
proportionally lower.
Customers can supply their own TTL level synchronization
logic, provided the frequency is between 1.2MHz and 2MHz,
and the duty cycle is greater than 25%.
FIGURE 4. Ripple Reduction.
V
IN
30
29
15
14
13
V
OUT
Sense
400
4.7nF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISO121 | Precision Low Cost ISOLATION AMPLIFIER |
| ISO121BG | Precision Low Cost ISOLATION AMPLIFIER |
| ISO121G | Precision Low Cost ISOLATION AMPLIFIER |
| ISO130 | |
| ISO130P | Amplifier. Other |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISO113 | 功能描述:隔離器接口集成電路 Lo-Cost Hi Vltg Iso Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
| ISO113B | 功能描述:隔離器接口集成電路 Lo-Cost Hi Vltg Iso Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
| ISO1176 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ISOLATED RS-485 PROFIBUS TRANSCEIVER |
| ISO1176_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ISOLATED RS-485 PROFIBUS TRANSCEIVER |
| ISO1176DW | 功能描述:隔離器接口集成電路 Iso PROFIBUS RS-485 Xcvr RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube |
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