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  • 參數(shù)資料
    型號(hào): SI8540-B-FSR
    廠商: Silicon Laboratories Inc
    文件頁(yè)數(shù): 16/18頁(yè)
    文件大小: 0K
    描述: IC CURRENT SENSOR AMP 8SOIC
    標(biāo)準(zhǔn)包裝: 3,000
    放大器類型: 電流檢測(cè)
    電路數(shù): 1
    電流 - 電源: 90µA
    電流 - 輸出 / 通道: 10mA
    電壓 - 電源,單路/雙路(±): 5 V ~ 36 V
    工作溫度: -40°C ~ 85°C
    安裝類型: 表面貼裝
    封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
    供應(yīng)商設(shè)備封裝: 8-SOICN
    包裝: 帶卷 (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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