參數(shù)資料
型號： MAX4073FAXK-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)： 8/10頁
文件大小： 261K
代理商： MAX4073FAXK-T
M
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
8
_______________________________________________________________________________________
somewhat better, and low-inductance metal-film resis-
tors are best suited for these applications.
For V
SENSE
= 100mV, full-scale output voltage can be
2V, 5V, or 10V depending on the gain. For proper oper-
ation, ensure V
CC
exceeds the full-scale output voltage
by 1.2V (see Output High Voltage (V
CC
- V
OH
) vs.
Temperature in the
Typical Operating Characteristics
).
Using a PCB Trace as R
SENSE
If the cost of R
SENSE
is an issue and accuracy is not
critical, use the alternative solution shown in Figure 2.
This solution uses copper PC board traces to create a
sense resistor. The resistivity of a 0.1-inch-wide trace of
2-ounce copper is approximately 30m
/ft. The resis-
tance-temperature coefficient of copper is fairly high
(approximately 0.4%/
°
C), so systems that experience a
wide temperature variance must compensate for this
effect. In addition, do not exceed the maximum power
dissipation of the copper trace.
For example, the MAX4073T (with a maximum load cur-
rent of 10A and an R
SENSE
of 5m
) creates a full-scale
V
SENSE
of 50mV that yields a maximum V
OUT
of 1V.
R
SENSE
in this case requires about 2 inches of 0.1 inch-
wide copper trace.
Output Impedance
The output of the MAX4073 is a current source driving a
12k
resistance. Resistive loading added to OUT
reduces the output gain of the MAX4073. To minimize
output errors for most applications, connect OUT to a
high-impedance input stage. When output buffering is
required, choose an op amp with a common-mode
input range and an output voltage swing that includes
ground when operating with a single supply. The op
amp
’
s supply voltage range should be at least as high
as any voltage the system may encounter.
The percent error introduced by output loading is deter-
mined with the following formula:
where R
LOAD
is the external load applied to OUT.
Current Source Circuit
Figure 3 shows a block diagram using the MAX4073
with a switching regulator to make a current source.
%
100
R
12k
R
1
ERROR
LOAD
LOAD
=
MAX4073T
V
SENSE
R
SENSE
0.1in COPPER
+3V TO +28V
0.1
μ
F
RS+
+
0.3in COPPER
INPUT
LOAD/BATTERY
0.3in COPPER
RS-
V
CC
GND
OUT
_
Figure 2. MAX4073T Connections Showing Use of PC Board
Figure 3. Current Source
MAX4073T/F/H
R
SENSE
I
LOAD
+2V TO +28V
V
SENSE
V
CC
OUT
V
IN
GND
RS+
+3V TO +28V
0.1
μ
F
RS-
LOAD/
BATTERY
LOW-COST
SWITCHING
REGULATOR
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相關代理商/技術參數(shù)
參數(shù)描述
MAX4073HAUT 制造商:Maxim Integrated Products 功能描述:VOLTAGE-OUTPUT, HIGH-SIDE CURRENT-SENSE AMPLIFIER - Rail/Tube
MAX4073HAUT+ 制造商:Maxim Integrated Products 功能描述:SP AMP CURRENT SENSE AMP SGL 28V 6PIN SOT-23 - Rail/Tube
MAX4073HAUT+T 功能描述:電流靈敏放大器 Voltage-Output High Side Crnt-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
MAX4073HAUT-T 功能描述:電流靈敏放大器 Voltage-Output High Side Crnt-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
MAX4073HAXK 制造商:Maxim Integrated Products 功能描述:VOLTAGE-OUTPUT, HIGH-SIDE CURRENT-SENSE AMPLIFIER - Rail/Tube
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