Cirrus-logic AN362 Manual do Utilizador descarregar pdf (Página 11)

AN362

AN362REV1 11

5. Accuracy Test with Shunt, U

= 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,

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 Ω

1KΩ

27nF

V+

V-

IIN1-

IIN1+

Shunt

100μΩ

Current

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Cirrus-logic AN362 Manual do Utilizador Página 11