AN3093

V-I output characteristics and cable drop compensation

Doc ID16539 Rev 1

19/29

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V-I output characteristics and cable drop

compensation

Figure 17 and Figure 18 show the V-I output characteristics at the PCB output connector,

Thanks to the self-supply of the ALTAIR05T-800, the output current can be regulated even

with an output voltage close to zero.

The IC is also equipped with a cable compensation function that compensates the output

voltage drop when a long cable is used, so ideally zero-load regulation can be achieved

even at the end of the cable.

Figure 19 shows the load regulation in CV mode when the CDC function is not used: the

voltage is tightly regulated at the end of the PCB connector, whereas at the end of the cable

it decreases proportionally to the output current.

Conversely, in Figure 20 the effect of the cable drop compensation is shown. The CV

setpoint is increased proportionally to the output current, in order to compensate the voltage

drop across the cable and maintaining the regulation at the end of the cable almost

constant.

Figure 17.