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Si8540-B-FW Fiches technique(PDF) 7 Page - Silicon Laboratories |
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Si8540-B-FW Fiches technique(HTML) 7 Page - Silicon Laboratories |
7 / 18 page 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 2.5 10 1 0.2 520 100 2 2 0.4 5 1 0.2 10 5 50 2 2 0.2 5 1 0.4 Si8540 SHDN Control GND OUT VOUT IOUT ROUT RG1 RG2 RG1 RG2 RSENSE SOURCE LOAD ILOAD + _ |
Numéro de pièce similaire - Si8540-B-FW |
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Description similaire - Si8540-B-FW |
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