Datasheet

Application information TSC1031

20/26 Doc ID 16875 Rev 2

The current multiplier gain K2 can be set to 2.5 or 5 depending on the voltage applied on the

SEL pin.

Since they define the full-scale output range of the application, the R

sense

resistor and the

amplification gain Av are important parameters and must therefore be selected carefully.

The TSC1031’s dedicated schematic eases the implementation of EMI filtering in harsh

environments. A simple filter is described in Figure 22, where the input filtering is performed

by R

, R

and C

The values of R

and R

should be equal so as to balance the contribution on both

amplifier inputs. The value of the C

capacitor should be selected so that the cut-off

frequency of the first-order low-pass filter provides enough attenuation to the high frequency

interferences.

To balance the contribution of R

and R

in the current sense amplifier gain, an output

resistor R

should be connected between pin A1 and Gnd. The value of R

should be

chosen according to the following formula.

K1 = 10 = R

= R

If these precautions having been taken, the TSC1031’s gain is unaffected by the

implementation of the input filtering resistors.