IPS161HF datasheet(12/27 Pages) STMICROELECTRONICS

12 / 27 page

Figure 6. Current limitation and cut-off

ILIM

tCOFF

IOUT

V IN

TJ TJSD

V DIAG

tPD(L-H)

tPD(H-L)

The fault condition is reported on the DIAG pin. The internal cut-off flag signal is latched at output switch-off and

released after the time tRES, the same behavior is signaled on DIAG pin.

The status of the DIAG is independent on the IN pin status.

If CoD pin is connected to GND through 1 kΩ resistor (cut-off feature disabled), when the output channel triggers

the limitation threshold, it remains on, in current limitation condition, until the input becomes LOW or the thermal

protection threshold is triggered.

In case of low ambient temperature conditions (TAMB < -20 °C) and high supply voltage (VCC > 36 V), the cut-off

function requires activation in order to avoid damaging the IC.

The following table shows the suggested cut-off delay for different operating voltages.

Table 10. Minimum cut-off delay for TAMB less than -20 °C

VCC [V]

Cut-off delay [μs]

Cut-off capacitance [nF]

36-48

100

2.2

48-60

IPS160HF, IPS161HF

Cut-off

DS13271 - Rev 2

page 12/27

IPS161HF Fiches technique(PDF) 12 Page - STMicroelectronics