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参数资料
| 型号： | MAX4080TAUA/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/14页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 8UMAX |
| 标准包装： | 2,500 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| 增益带宽积： | 250kHz |
| 电流 - 输入偏压： | 5µA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 75µA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 76 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
The full-scale output voltage is VOUT = RSENSE ILOAD
(MAX) AV, for the MAX4080 and VOUT = VREF ±
RSENSE ILOAD(MAX) AV for the MAX4081.
VSENSE(MAX) is 1000mV for the 5V/V gain version,
250mV for the 20V/V gain version, and 100mV for the
60V/V gain version.
Choosing the Sense Resistor
Choose RSENSE based on the following criteria:
Voltage Loss: A high RSENSE value causes the
power-source voltage to degrade through IR loss. For
minimal voltage loss, use the lowest RSENSE value.
Accuracy: A high RSENSE value allows lower cur-
rents to be measured more accurately. This is due to
offsets becoming less significant when the sense
voltage is larger. For best performance, select
RSENSE to provide approximately 1000mV (gain of
5V/V), 250mV (gain of 20V/V), or 100mV (gain of
60V/V) of sense voltage for the full-scale current in
each application.
Efficiency and Power Dissipation: At high current
levels, the I2R losses in RSENSE 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 ISENSE has a
large high-frequency component. Wire-wound resis-
tors have the highest inductance, while metal film is
somewhat better. Low-inductance, metal-film resis-
tors are also available. Instead of being spiral-
wrapped around a core, as in metal-film or wire-
wound resistors, they are a straight band of metal
and are available in values under 1
.
Because of the high currents that flow through RSENSE,
take care to eliminate parasitic trace resistance from
causing errors in the sense voltage. Either use a four-
terminal current-sense resistor or use Kelvin (force and
sense) PC board layout techniques.
Dynamic Range Consideration
Although the MAX4081 have fully symmetrical bidirec-
tional VSENSE input capability, the output voltage range
is usually higher from REF to VCC and lower from REF
to GND (unless the supply voltage is at the lowest end
of the operating range). Therefore, the user must con-
sider the dynamic range of current monitored in both
directions and choose the supply voltage and the refer-
ence voltage (REF) to make sure the output swing
above and below REF is adequate to handle the swings
without clipping or running out of headroom.
Power-Supply Bypassing and Grounding
For most applications, bypass VCC to GND with a 0.1F
ceramic capacitor. In many applications, VCC can be
connected to one of the current monitor terminals (RS+
or RS-). Because VCC is independent of the monitored
voltage, VCC can be connected to a separate regulated
supply.
If VCC will be subject to fast-line transients, a series
resistor can be added to the power-supply line of the
MAX4080/MAX4081 to minimize output disturbance.
This resistance and the decoupling capacitor reduce
the rise time of the transient. For most applications, 1k
in conjunction with a 0.1F bypass capacitor work well.
The MAX4080/MAX4081 require no special considera-
tions with respect to layout or grounding. Consideration
should be given to minimizing errors due to the large
charge and discharge currents in the system.
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
MAX4081
RSENSE
ILOAD = 0
LOAD
VCC
GND
RS-
RS+
OUT
REF1A
REF1B
5V
10V
MAX4081
RSENSE
ILOAD = 0
LOAD
VCC
GND
RS-
RS+
OUT
REF1A
REF1B
5V
Figure 4. MAX4081 Reference Inputs
MAX4080/MAX4081
12
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4080TAUV | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:76V, High-Side, Current-Sense Amplifiers with Voltage Output |
| MAX4081 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:76V, High-Side, Current-Sense Amplifiers with Voltage Output |
| MAX4081FASA | 功能描述:电流灵敏放大器 76V High-Side Crnt Sense Amp w/V Out RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4081FASA+ | 功能描述:电流灵敏放大器 76V High-Side Crnt Sense Amp w/V Out RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4081FASA+T | 功能描述:电流灵敏放大器 76V High-Side Crnt Sense Amp w/V Out RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
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