Advantech PCI-1720U Manual de usuario descargar pdf (Pagina 34)

PCI-1720U User Manual 28

where

VS: Power supply voltage of current sink.

RL: Load of current sink.

PD: Power dissipation of FET.

When you determine VS and RL, three conditions must be satisfied.

VS > (RL + 249) ( 0.02)

VS £ 50

PD = (VS - (RL + 249) x 0.02) x 0.02 < 0.2

Example 1

If you use the internal power supply VS = +12 V, RL must be less than

351 W (12 / 0.02 - 249 > RL). Select RL = 200 W, PD = 0.0604 < 0.2

OK!

Example 2

If you use the external power supply VS = +40 V, RL must be less than

1.75 kW (40 / 0.02 - 249 > RL).

Select RL = 200 W, PD = 0.62 > 0.2 fail!

Reselect RL = 1 kW, PD = 0.3 > 0.2 fail!

Reselect RL = 1.5 kW, PD = 0.1 < 0.2 OK!

1 2 ... 29 30 31 32 33 34 35 36 37 38

Sin comentarios

Advantech PCI-1720U Manual de usuario Pagina 34