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參數(shù)資料
| 型號(hào)： | MAX472 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Extended Common-mode RS-485 Transceiver 8-PDIP -40 to 85 |
| 中文描述： | 高精度、高邊電流檢測(cè)放大器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 120K |
| 代理商： | MAX472 |
require, given the full-scale I
OUT
determined by
R
SENSE
, RG1, and RG2. The high compliance of OUT
permits using R
OUT
values up to 10k
with minimal
error. Values above 10k
are not usually recommend-
ed. The impedance of OUT’s load (e.g., the input of an
op amp or ADC) must be much greater than R
OUT
(e.g., 100 x R
OUT
) to avoid degrading the measure-
ment accuracy.
High-Current Measurement
The MAX472 can achieve higher current measurements
than the MAX471 can. Low-value sense resistors may
be paralleled to obtain even lower values, or the PC
board trace may be adjusted for any value.
An alternative method is to connect several MAX471s in
parallel and connect the high-impedance current-
source OUT pins together to indicate the total system
current (Figure 3). Pay attention to layout to ensure
equal IR drops in the paralleled connection. This is
necessary to achieve equal current sharing.
Power-S upply Bypassing and Grounding
The MAX471 has been designed as a “high side” (posi-
tive terminal) current monitor to ease the task of
grounding any battery charger, thermistor, etc. that
may be a part of the battery pack. Grounding the
MAX471 requires no special precautions; follow the
same cautionary steps that apply to the system as a
whole. High-current systems can experience large volt-
age drops across a ground plane, and this drop may
add to or subtract from V
OUT
. For highest current-mea-
surement accuracy, use a single-point “star” ground.
The MAX471/MAX472 require no special bypassing,
and respond quickly to transient changes in line cur-
rent. If the noise at OUT caused by these transients is a
problem, you may want to place a 1μF capacitor at the
OUT pin to ground. You can also place a large capaci-
tor at the RS- terminal (or “l(fā)oad” side of the MAX472) to
decouple the load and, thereby, reduce the current
transients. These capacitors are not required for
MAX471/MAX472 operation or stability, and their use
will not degrade performance.
For the MAX472, the RG1 and RG2 inputs can be fil-
tered by placing a capacitor (e.g., 1μF) between them
to average the sensed current.
MAX 471 Layout
The MAX471 must be soldered in place, since sockets
can cause uneven current sharing between the RS+
pins (pins 2 and 3) and the RS- pins (pins 6 and 7),
resulting in typical errors of 0.5%.
In order to dissipate sense-resistor heat from large
sense currents, solder the RS+ pins and the RS- pins to
large copper traces. Keep the part away from other
heat-generating devices. This procedure will ensure
continuous power dissipation rating.
M
Prec ision, High-S ide
Current-S ense Amplifiers
______________________________________________________________________________________
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4720ELT+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4720ELT+T | 功能描述:模擬開關(guān) IC Single-Supply SPDT Analog Switch RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX4720ELT+TG104 | 功能描述:模擬開關(guān) IC Single-Supply SPDT Analog Switch RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:2 開關(guān)配置:SPDT 開啟電阻（最大值）:0.1 Ohms 切換電壓（最大）: 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
| MAX4720EYT+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4720EYT+T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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