IPS161HF datasheet(14/27 Pages) STMICROELECTRONICS

14 / 27 page

When an 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 false detection of the open load event when 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 ≥ VUVOFF. 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 8. VCC disconnection

OUT

GND

SUPPLY RAIL

GROUND PLANE

APPLICATION BOARD

VCC

EXPOSED

PAD

CVCC

VCC >VUVOFF

DRIVING

CIRCUITRY

IPS160HF, IPS161HF

VCC disconnection protection

DS13271 - Rev 2

page 14/27

IPS161HF Arkusz danych(PDF) 14 Page - STMicroelectronics