L6472 datasheet(28/69 Pages) STMICROELECTRONICS

28 / 69 page

Functional description

L6472

28/69

Doc ID 022729 Rev 1

Figure 12.

OSCIN and OSCOUT pin configurations

Note:

When OSCIN is UNUSED, it should be left floating.

When OSCOUT is UNUSED it should be left floating.

6.9

Overcurrent detection

When the current in any of the Power MOSFETs exceeds a programmed overcurrent

threshold, the STATUS register OCD flag is forced low until the overcurrent event expires

and a GetStatus command is sent to the IC (see Section 9.1.19 and 9.2.20). The

overcurrent event expires when all the Power MOSFET currents fall below the programmed

overcurrent threshold.

The overcurrent threshold can be programmed through the OCD_TH register in one of 16

available values ranging from 375 mA to 6 A with steps of 375 mA (see Table 17).

It is possible to set if an overcurrent event causes or not the MOSFET turn-off (bridges in

high-impedance status) acting on the OC_SD bit in the CONFIG register (see

Section 9.1.18). The OCD flag in the STATUS register is raised anyway (see Table 25).

When the IC outputs are turned-off by an OCD event, they cannot be turned on until the

OCD flag is released by a GetStatus command.

Attention:

The overcurrent shutdown is a critical protection feature. It is

not recommended to disable it.

L6472 Arkusz danych(PDF) 28 Page - STMicroelectronics