IPS160H datasheet(15/26 Pages) STMICROELECTRONICS

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IPS160H

Protection and diagnostic

DocID027563 Rev 2

15/26

Figure 6: Open load off-state

In case of wire break and during the OFF state (IN = low), the output voltage VOUT rises

according to the the partitioning between the external pull-up resistor and the internal

resistance of the IC (RI).

The effect of the LED (if any) on the output pin has to be considered as well. In case of wire

break and during the ON state (IN = high), the output voltage VOUT is pulled up to VCC by

the low resistive integrated switch. If the load is not connected, in order to guarantee the

correct open load signalization it must result:

VOUT > VOLoff(max.)

Referring to the circuit in figure 6:

�� = �� − �� × �� = �� − �� × (�� + �� + ��)

therefore:

�� <

��(��) − ��(��)

(

��(��)

��

��(��) − ��

��

)

If the load is connected, in order to avoid any false signalization of the open load, it must

result as follows:

VOUT < VOLoff(min)

By taking into account the circuit in figure 6:

�� = �� − �� × �� = �� − �� × (

��

�� − ��

��

)

so:

�� >

��(��) − ��(��)

(

��(��)

��

��(��) − ��

��

��(��)

��

)

The fault condition is reported on the DIAG pin and the fault reset occurs when load is

reconnected.

OUT

PGND

SUPPLY RAIL

GROUND PLANE

Application board

IPS160H

RLOAD

RPU

Open load

detection signal

VOLOFF

VCC

EXPOSED PAD

RLED

R I

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