IPS161H datasheet(16/25 Pages) STMICROELECTRONICS

16 / 25 page

Protection and diagnostic

IPS161H

16/25

DocID029436 Rev 2

If the channel is switched on by IN pin, the fault condition is no longer detected.

When inductive load is driven, some ringing of the output voltage may be observed at the

end of the demagnetization. In fact, the load is completely demagnetized when ILOAD = 0 A

and the OUT pin remains floating until next turn-on. In order to avoid a fake signalization of

the open load event driving inductive loads, the open load signal is masked for tBKT. So, the

open load is reported on the DIAG pin with a delay of tBKT and if the open load event is

triggered for more than tBKT.

6.5

VCC disconnection protection

The IC is protected despite the VCC disconnection event. This event is intended as the

disconnection of the VCC wire from the application board, see figure below. When this

condition happens, the IC continues working normally until the voltage on the VCC

pin is ≥

VUV(OFF). Once the VUVOFF is triggered, the output channel is turned off independently on the

input status. In case of inductive load, if the VCC is disconnected while the output channel is

still active, the IC allows the discharge of the energy still stored in the inductor through the

integrated power switch.

Figure 7: VCC disconnection

6.6

GND disconnection protection

GND disconnection is intended as the disconnection event of the application ground, see

figure below. When this event happens, the IC continues working normally until the voltage

between VCC and GN

D pins of the IC results ≥ VUVOFF. The voltage on GND pin of the IC

rises up to the supply rail voltage level. In case of GND disconnection event, a current

(ILGND) flows through OUT pin. Table 8: "Logic inputs" reports IOUT = ILGND for the worst case

of GND disconnection event in case of output shorted to ground.

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