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| 型号： | MAX4554CSE |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/28页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH DUAL 3PST 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 功能： | 开关 |
| 电路： | 2 x 3PST - NO |
| 导通状态电阻： | 6 欧姆 |
| 电压电源： | 单/双电源 |
| 电压 - 电源，单路/双路(±)： | 9 V ~ 40 V，±4.5 V ~ 20 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
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MAX4554/MAX4555/MAX4556
Force-Sense Switches
14
______________________________________________________________________________________
______________Force-Sense Philosophy
When a precise voltage must be applied to a load that
draws appreciable current, the resistance of the con-
ductors connecting the source and the load can
degrade the load voltage. The resistance of the con-
ductors forms a voltage divider with the load, so that
the load voltage is lower than the source voltage. The
greater the distance between the source and the load,
and the greater the current or conductor resistance, the
greater the degradation. The resulting signal reduction
can be overcome and the signal at the load guaranteed
by using a 4-wire technique known as Kelvin sensing,
or force-sense.
The basic idea behind the force-sense philosophy is to
use four wires, forcing a voltage or current through two
high-current wires to the load, and measuring (sensing)
the voltage with two separate wires that carry very low
or negligible current. One of two basic configurations is
used, depending on whether or not feedback is em-
ployed:
1) The sensed voltage can be completely independent
of the forced voltage or current, as in the case of a
4-wire ohmmeter, where a constant current is forced
through one pair of wires and the voltage at the
resistor is measured by another pair.
2) The sensed voltage can be part of a feedback cir-
cuit to force the load voltage to the desired value,
as in the case of a 4-wire power supply. (In rare
cases, this method is also used to measure resis-
tance; the source is forced to produce a desired
voltage in the resistor, and the source current
required to achieve this voltage is measured.)
In all cases, the resistance of the high-current conduc-
tors can be ignored and the sensed voltage is an accu-
rate measure of the load (or resistor’s) voltage, despite
appreciable voltage loss in the wires connecting the
source and load.
There are two limitations to this scheme. First, the maxi-
mum source voltage (compliance) must be able to
overcome the combined voltage loss of the load and
the connecting wires. In other words, the conductors in
the force circuit can have significant resistance, but
there is a limit. Second, the impedance of the sensing
circuit (typically a voltmeter, A/D converter, or feedback
amplifier) must be very high compared to the load
resistance and the sense wire resistance. These limita-
tions are usually simple to overcome. The source com-
pliance is usually required to be only a volt more than
the load voltage, and the sense circuit usually has a
multimegohm impedance. Typical 4-wire force-sense
configurations are shown in Figure 1.
VOLTAGE
MEASUREMENT
MEASURED
RESISTANCE
CURRENT SOURCE
FORCE CURRENT
SENSE VOLTAGE
WIRE AND TERMINAL RESISTANCE
4-WIRE RESISTANCE MEASUREMENT (CONSTANT CURRENT)
VOLTAGE
MEASUREMENT
MEASURED
RESISTANCE
VOLTAGE SOURCE
FORCE VOLTAGE
SENSE VOLTAGE
WIRE AND TERMINAL RESISTANCE
4-WIRE RESISTANCE MEASUREMENT (CONSTANT VOLTAGE)
VOLTAGE
MEASUREMENT
LOAD
CURRENT SOURCE
FORCE CURRENT
SENSE VOLTAGE
WIRE AND TERMINAL RESISTANCE
4-WIRE POWER SUPPLY
FEED-
BACK
V
FEED-
BACK
ARROWS INDICATE SIGNAL DIRECTION, NOT POLARITY
Figure 1. 4-Wire Force-Sense Measurements
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4554CSE+ | 功能描述:模拟开关 IC Force-Sense Switch RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4554CSE+T | 功能描述:模拟开关 IC Force-Sense Switch RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4554CSE-T | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4554EPE | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
| MAX4554EPE+ | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
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