參數(shù)資料
型號： MAX4073TAXK-T
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 電源管理
英文描述： Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier
中文描述： POWER SUPPLY SUPPORT CKT, PDSO5
封裝： SC-70, 5 PIN
文件頁數(shù)： 7/10頁
文件大?。?/td> 261K
代理商： MAX4073TAXK-T
Detailed Description
The MAX4073 high-side current-sense amplifier fea-
tures a +2V to +28V input common-mode range that is
independent of supply voltage. This feature allows the
monitoring of current out of a battery as low as +2V and
also enables high-side current sensing at voltages
greater than the supply voltage (V
CC
).
The MAX4073 operates as follows: current from the
source flows through R
SENSE
to the load (Figure 1). Since
the internal-sense amplifier
’
s inverting input has high
impedance, negligible current flows through RG2
(neglecting the input bias current). Therefore, the
sense amplifier
’
s inverting-input voltage equals
V
SOURCE
- (I
LOAD
)(R
SENSE
). The amplifier
’
s open-loop
gain forces its noninverting input to the same voltage as
the inverting input. Therefore, the drop across RG1
equals (I
LOAD
)(R
SENSE
). Since I
RG1
flows through RG1,
I
RG1
= (I
LOAD
)(R
SENSE
) / RG1. The internal current mirror
multiplies I
RG1
by a current gain factor,
β
, to give
I
RGD
=
β
I
RG1
. Solving I
RGD
=
β
(I
LOAD
)(R
SENSE
) /
RG1. Assuming infinite output impedance, V
OUT
= (I
RGD
)
(RGD). Substituting in for I
RGD
and rearranging, V
OUT
=
β
(RGD / RG1)(R
SENSE
I
LOAD
). The parts gain equals
β
RGD / RG1. Therefore, V
OUT
= (GAIN) (R
SENSE
)
(I
LOAD
), where GAIN = 20V/V for MAX4073T, GAIN =
50V/V for MAX4073F, and GAIN = 100V/V for MAX4073H.
Set the full-scale output range by selecting R
SENSE
and
the appropriate gain version of the MAX4073.
Applications Information
Recommended Component Values
The MAX4073 senses a wide variety of currents with
different sense resistor values. Table 1 lists common
resistor values for typical operation of the MAX4073.
Choosing R
SENSE
To measure lower currents more accurately, use a
large value for R
SENSE
. The larger value develops a
higher-sense voltage that reduces offset voltage errors
of the internal op amp. Typical sense voltages range
between 10mV and 150mV.
In applications monitoring very high currents, R
SENSE
must be able to dissipate the I
2
R losses. If the resistor
’
s
rated 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 (±5V).
If I
SENSE
has a large high-frequency component, mini-
mize the inductance of R
SENSE
. Wire-wound resistors
have the highest inductance, metal-film resistors are
M
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
_______________________________________________________________________________________
7
Pin Description
PIN
SOT23-6
1, 2
3
4
5
SC70-5
2
3
4
5
NAME
FUNCTION
GND
V
CC
RS+
RS-
Ground
Supply Voltage Input. Bypass to GND with a 0.1
μ
F capacitor.
Power-Side Connection to the External Sense Resistor
Load-Side Connection to the External Sense Resistor
6
1
OUT
Voltage Output. V
OUT
is proportional to V
SENSE
. Output impedance is approximately
12k
.
R
SENSE
V
SOURCE
+2V TO +28V
+3V TO +28V
RGD
= 12k
V
OUT
I
RG1
I
RGD
I
LOAD
R
G1
R
G2
RS-
RS+
OUT
GND
TO LOAD/BATTERY
V
CC
CURRENT
MIRROR
A1
MAX4073T/F/H
Figure 1. Functional Diagram
相關(guān)PDF資料
PDF描述
MAX4073TAUT-T Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4074 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
MAX4074__ESA 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
MAX4074__EUK- 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps
MAX4074ABESA 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)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
MAX4074ABEUK-T 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)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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