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參數(shù)資料
| 型號： | MAX4069-MAX4072 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Bidirectional, High-Side, Current-Sense Amplifiers with Reference |
| 中文描述： | 雙向，高側(cè)電流檢測放大器的參考 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 472K |
| 代理商： | MAX4069-MAX4072 |
External Reference (MAX4072)
The MAX4072 contains REFIN pin for external refer-
ence voltage. The allowable voltage range on REFIN is
1V (min) to 4V (max) with V
CC
≥
5.1V.
Reference Output
(MAX4069/MAX4060/MAX4071)
The REFOUT of the MAX4069/MAX4070/MAX4071 can
sink 100μA and source 500μA. Keep the total capaci-
tance on REFOUT under 500pF to maintain stability.
Recommended Component Values
Ideally, the maximum load current develops the full-
scale sense voltage across the current-sense resistor.
Choose the gain needed to yield the maximum output
voltage required for the application:
V
OUT
= V
SENSE
x A
V
where V
SENSE
is the full-scale sense voltage, 75mV for
gain of 50V/V, or 50mV for gain of 100V/V. A
V
is the
gain of the device.
In applications monitoring high current, ensure that
R
SENSE
is able to dissipate its own I
2
R loss. If the resis-
tor
’
s power dissipation is exceeded, its value may drift
or it may fail altogether, causing a differential voltage
across the terminals in excess of the absolute maxi-
mum ratings. Use resistors specified for current- sens-
ing applications.
The MAX4069
–
MAX4072 sense a wide variety of cur-
rents with different sense-resistor values. Table 1 lists
common resistor values for typical operation of these
devices. Listed output voltage is with respect to REF.
Sense Resistor, R
SENSE
Choose R
SENSE
based on the following criteria:
Voltage Loss:
A high R
SENSE
value causes the power-
source voltage to degrade through IR loss. For minimal
voltage loss, use the lowest R
SENSE
value.
Accuracy:
A high R
SENSE
value allows lower currents
to be measured more accurately. This is because off-
sets become less significant when the sense voltage is
larger. For best performance, select R
SENSE
to provide
approximately 75mV (gain of 50V/V) or 50mV (gain of
100V/V) of sense voltage for the full-scale current in
each application.
Efficiency and Power Dissipation:
At high-current lev-
els, the I
2
R losses in R
SENSE
can be significant. Take
this into consideration when choosing the resistor value
and its power dissipation (wattage) rating. Also, the
sense resistor
’
s value might drift if it is allowed to heat
up excessively.
Inductance:
Keep inductance low if I
SENSE
has a large
high-frequency component. Wire-wound resistors have
the highest inductance, while metal film is somewhat
better. Low-inductance metal-film resistors are also
available. Instead of being spiral-wrapped round a
M
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
______________________________________________________________________________________
11
MAX4070
I
DISCHARGE
R
SENSE
I
CHARGE
LOAD
TO ADC
2.5V
V
CC
GSEL
GND
RS-
RS+
REFOUT
OUT
SHDN
2
CELLS
-25mV
25mV
50mV
0
DISCHARGE
CURRENT
CHARGE
CURRENT
-2.5V
5V
2.5V
A
V
= 100
V
OUT
- V
REF
V
SENSE
Figure 2. Bidirectional Current Monitor
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4071AUA | Bidirectional, High-Side, Current-Sense Amplifiers with Reference |
| MAX4070ATA | Bidirectional, High-Side, Current-Sense Amplifiers with Reference |
| MAX4071ATA | Bidirectional, High-Side, Current-Sense Amplifiers with Reference |
| MAX4072ATA | Bidirectional, High-Side, Current-Sense Amplifiers with Reference |
| MAX4070AUA | Bidirectional, High-Side, Current-Sense Amplifiers with Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX406A | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1.2レA Max, Single/Dual/Quad, Single-Supply Op Amps |
| MAX406AC/D | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1.2レA Max, Single/Dual/Quad, Single-Supply Op Amps |
| MAX406ACPA | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX406ACPA+ | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX406ACSA | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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