L9788 datasheet(107/264 Pages) STMICROELECTRONICS

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DS12308 Rev 4

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L9788

High/low-side drivers - STARTER STR[1:3]

263

High/low-side drivers - STARTER STR[1:3]

These 3 high/low-side drivers with diagnosis and overcurrent protection have a floating

architecture and can be used in high-side or low-side mode.

The configuration is defined by MSC bit (LSD/HSD_DRVx-CFG CONFIG_REG3 D1~D3).

The driver is optimized for relay and low-current loads, and it can be associated to smart

starter functional block.

They are driven by MSC command. The Output voltage is clamped to voltage limit by

internal clamp circuit. In order to guarantee a negligible output current in case of LED

application an internal dedicated comparator is present. This comparator, in case of high-

side configuration, Diagoff disabled and channel OFF, determines the disabling of internal

driver in case of output voltage (STR_SRC) pin in the range of -0.4V typ < STR_SRC< 1.8V

typ. This implementation guarantees a negligible output current down to 0V on STR_SRC

pin (where internal compensation is no more effective) and at the same time the correct re-

enabling of the driver when the output voltage goes negative, in order to guarantee the

correct clamping functionality during recirculation. In any other condition (Low-side

configuration, or Diagoff enabled, or channel ON) the effect of this comparator is masked

and an output current will be observed.

Figure 40. Configurable high/low -side Driver block schematic

The driver has the following detection diagnosis in low-side mode:



Overcurrent (Short to Vbat) protection in On Phase (OVC);



Open Load in Off phase (DIAGOL);



Short to Ground in Off Phase (DIAGLV);



Over Temperature Protection in On phase (OT);



The driver has the following detection diagnosis in high-side mode:

Overcurrent (Short To GND) protection in On Phase (OVC);



Open Load in Off phase (DIAGOL);



Short to battery in Off Phase (DIAGHV);



Over Temperature Protection in On phase (OT);

GADG0212161507PS

STRx_SRC

STRx_DRN

STR DRIVER

LOAD

VBAT

Command

Driver

OFF state - LS

OL & STG detection

ON state

OC & OT protection

LS_CONF

HS_CONF

LOAD

LS_CONF

HS_CONF

GND

WD reset

OFF state - HS

OL & STG detection

Chip en

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