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參數(shù)資料
| 型號(hào)： | MAX4073EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | EVALUATION KIT FOR MAX4073 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 電流檢測(cè) |
| 輸出類型： | 單端 |
| -3db帶寬： | 1.7MHz |
| 工作溫度： | -40°C ~ 125°C |
| 電流供應(yīng)（主 IC）： | 500µA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 28 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX4073 |
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 (VCC).
The MAX4073 operates as follows: current from the
source flows through RSENSE 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
VSOURCE - (ILOAD)(RSENSE). The amplifier’s open-loop
gain forces its noninverting input to the same voltage as
the inverting input. Therefore, the drop across RG1
equals (ILOAD)(RSENSE). Since IRG1 flows through RG1,
IRG1 = (ILOAD)(RSENSE) / RG1. The internal current mirror
multiplies IRG1 by a current gain factor, β, to give
IRGD = β IRG1. Solving IRGD = β (ILOAD)(RSENSE)/
RG1. Assuming infinite output impedance, VOUT = (IRGD)
(RGD). Substituting in for IRGD and rearranging, VOUT =
β (RGD/RG1)(RSENSE ILOAD). The parts gain equals
β RGD/RG1. Therefore, VOUT = (GAIN) (RSENSE)
(ILOAD), 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 RSENSE 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 RSENSE
To measure lower currents more accurately, use a
large value for RSENSE. 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, RSENSE
must be able to dissipate the I2R 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 ISENSE has a large high-frequency component, mini-
mize the inductance of RSENSE. Wire-wound resistors
have the highest inductance, metal-film resistors are
MAX4073T/F/H
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
7
Maxim Integrated
Pin Description
PIN
SOT23
SC70
NAME
FUNCTION
1, 2
2
GND
Ground
33
VCC
Supply Voltage Input. Bypass to GND with a 0.1F capacitor.
4
RS+
Power-Side Connection to the External Sense Resistor
5
RS-
Load-Side Connection to the External Sense Resistor
6
1
OUT
Voltage Output. VOUT is proportional to VSENSE. Output impedance is approximately
12k.
RSENSE
VSOURCE
+2V TO +28V
+3V TO +28V
RGD = 12k
VOUT
IRG1
IRGD
ILOAD
RG1
RG2
RS-
RS+
OUT
GND
TO LOAD/BATTERY
VCC
CURRENT
MIRROR
A1
MAX4073T/F/H
Figure 1. Functional Diagram
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參數(shù)描述 |
|---|---|
| MAX4073EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX4073 Max4073 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| MAX4073F_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier |
| MAX4073FAUT | 制造商:Maxim Integrated Products 功能描述:VOLTAGE-OUTPUT, HIGH-SIDE CURRENT-SENSE AMPLIFIER - Rail/Tube |
| MAX4073FAUT+ | 制造商:Maxim Integrated Products 功能描述:SP AMP CURRENT SENSE AMP SGL 28V 6PIN SOT-23 - Rail/Tube |
| MAX4073FAUT+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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
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