STSPIN230 datasheet(14/22 Pages) STMICROELECTRONICS

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Functional description

STSPIN230

14/22

DocID029312 Rev 4

6.3

Overcurrent and short-circuit protection

The device embeds circuitry protecting each power output against the overload and short-

circuit conditions (short to ground, short to VS and short between outputs).

When the overcurrent or the short-circuit protection is triggered the power stage is disabled

and the EN\FAULT input is forced low through the integrated open-drain MOSFET

discharging the external CEN capacitor (refer to Figure 4).

The power stage is kept disabled and the open-drain MOSFET is kept ON until the

EN\FAULT input falls below the VRELEASE threshold, then the CEN capacitor is charged

through the REN resistor.

Figure 4. Overcurrent and short-circuit protections management

The total disable time after an overcurrent event can be set by properly sizing the external

network connected to the EN\FAULT pin (refer to Figure 4):

Equation 1

tDIS = tdischarge + tcharge

But tcharge is normally much higher than tdischarge, thus we can consider only the second one

contribution:

Equation 2

Where VDD is the pull-up voltage of the REN resistor.

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