Cirrus-logic AN362 Manual de usuario Pagina 11

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AN362
AN362REV1 11
5. Accuracy Test with Shunt, U
n
= 240V and I
b(max)
= 2.5(100A) at 50Hz
A 100μΩ shunt is used as the current sensor. When the meter is applied with the maximum load current,
I
max
= 100A, the voltage output from the shunt is 10mV
RMS
, which is below the maximum I-channel input range
when setting the PGA for current channel 1 (I1) to 50x.
High-pass filter (HPF) is enabled on the voltage channel: V1FLT[1:0] = ‘01’
High-pass filter (HPF) is enabled on the current channel: I1FLT[1:0] = ‘01’
Figure 10. Connection between Shunt and CS5480
CS5480
IIN 1-
IIN 1+
1K
1K
27nF
27nF
V+
V-
IIN1-
IIN1+
J1
Shunt
100μΩ
Current
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