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參數(shù)資料
| 型號： | MAX471ESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Extended Common-mode RS-485 Transceiver 8-SOIC -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 120K |
| 代理商： | MAX471ESA |
M
for current summing. A single scaling resistor is
required when summing OUT currents from multiple
devices (Figure 3). Current can be integrated by con-
necting OUT to a capacitive load.
S IGN Output
The current at OUT indicates magnitude. The SIGN out-
put indicates the current’s direction. Operation of the
SIGN comparator is straightforward. When Q1 (Figures
1 and 2) conducts, the output of A1 is high while A2’s
output is zero. Under this condition, a high SIGN output
indicates positive current flow (from RS+ to RS-). In bat-
tery-operated systems, this is useful for determining
whether the battery is charging or discharging. The
SIGN output may not correctly indicate if the load cur-
rent is such that I
OUT
is less than 3.5μA. The MAX471’s
SIGN output accurately indicates the direction of cur-
rent flow for load currents greater than 7mA.
SIGN is an open-collector output (sinks current only),
allowing easy interface with logic circuits powered from
any voltage. Connect a 100k
pull-up resistor from
SIGN to the logic supply. The convention chosen for
the polarity of the SIGN output ensures that it draws no
current when the battery is being discharged. If current
direction is not needed, float the SIGN pin.
S hutdown
When SHDN is high, the MAX471/MAX472 are shut
down and consume less than 18μA. In shutdown mode,
SIGN is high impedance and OUT turns off.
__________Applic ations Information
MAX 471
The MAX471 obtains its power from the RS- pin. This
includes MAX471 current consumption in the total sys-
tem current measured by the MAX471. The small drop
across R
SENSE
does not affect the MAX471’s perfor-
mance.
Resistor Selection
Since OUT delivers a current, an external voltage gain-
setting resistor (R
OUT
to ground) is required at the OUT
pin in order to get a voltage. R
SENSE
is internal to the
MAX471. RG1 and RG2 are factory trimmed for an out-
put current ratio (output current to load current) of
500μA/A. Since they are manufactured of the same
material and in very close proximity on the chip, they
provide a high degree of temperature stability. Choose
R
OUT
for the desired full-scale output voltage up to RS-
- 1.5V (see the Current Outputsection).
Prec ision, High-S ide
Current-S ense Amplifiers
8
_______________________________________________________________________________________
MAX471
RS+
RS+
RS-
RS-
SIGN
OUT
GND
TOLOAD/
CHARGER
3V
TO
36V
MAX471
RS+
RS+
RS-
RS-
SIGN
OUT
GND
1k
100k
LOGIC
SUPPLY
V
OUT
3V
TO
36V
R
SENSE
1
2
3
4
8
7
6
5
MAX472
RG2
100k
RG1
POWER
SOURCE
OR
BATTERY
TOLOAD/CHARGER
RG1
N.C.
SHDN
SIGN
OUT
V
CC
GND
RG2
R
OUT
LOGIC
SUPPLY
Figure 3. Paralleling MAX471s to Sense Higher Load Current
Figure 4. MAX472 Standard Application Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX472 | Extended Common-mode RS-485 Transceiver 8-PDIP -40 to 85 |
| MAX471 | Precision, High-Side Current-Sense Amplifiers |
| MAX472CSA | Precision, High-Side Current-Sense Amplifiers |
| MAX472EPA | Precision, High-Side Current-Sense Amplifiers |
| MAX472ESA | Precision, High-Side Current-Sense Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX471ESA+ | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX471ESA+T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX471ESA-T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| 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）: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 工作電源電壓:2.7 V to 4.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-16 |
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