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| 型号： | SI8540-B-FWR |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 16/18页 |
| 文件大小： | 0K |
| 描述： | IC CURRENT SENSOR AMP SOT23-5 |
| 标准包装： | 3,000 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| 电流 - 电源： | 90µA |
| 电流 - 输出 / 通道： | 10mA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 36 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
Si8540
Rev. 1.2
7
3. Functional Description
The Si8540 is designed to operate over an input common-mode range of 5 to 36 V. Figure 2 shows an example
Si8540 application with external sense resistor, RSENSE, external current gain-setting resistors, RG1 and RG2, and
output scaling resistor, ROUT. The supply current flowing into the Si8540 inverting and non-inverting inputs (RG1,
RG2) is negligible compared to ILOAD and, as a result, has no appreciable effect on measurement accuracy. The
internal current sense amplifier measures the differential input voltage, VSENSE, and generates an output current
proportional to ILOAD. Resistor ROUT converts this current to a voltage, and its value determines the output signal
gain. The Si8540 is placed in a low-power shutdown mode when SHDN is at VIH.
Figure 2. Si8540 Application Circuit
3.1. Application Information
The Si8540 can sense a wide range of currents with different sense resistor values. Table 3 lists typical operational
values.
Table 3. Recommended Current Sense Resistor for a Given Full-Scale Load Current
Full-scale
Load
Current
ISENSE (A)
Current-
Sense
Resistor
RSENSE (m)
Gain-Setting
Resistors,
RG1 = RG2 (
)
Output
Resistor,
ROUT
(k
)
Full-Scale
Output
Voltage,
VOUT (V)
Scale
Factor
VOUT/ISENSE
(V/A)
Typical Error at 1, 10
and 100% of Full
Load (%)
1%
10%
100%
0.1
1000
200
5
2.5
25
10
1
0.2
1
100
200
5
2.5
10
1
0.2
520
100
2
0.4
5
1
0.2
10
5
50
2
0.2
5
1
0.4
Si8540
SHDN
Control
GND
OUT
VOUT
IOUT
ROUT
RG1
RG2
RG1
RG2
RSENSE
SOURCE
LOAD
ILOAD
+
_
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