L9779WD-SPI datasheet(55/141 Pages) STMICROELECTRONICS

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L9779WD-SPI

Functional description

140

6.8.3

LSc function OUT20 (low current drivers)

Figure 35. LSc function OUT20 (low current drivers)

LSc functionality description

LSc is 1 protected Low-Side drivers with diagnosis and over current protection circuit. The

off state diagnosis (open load and short to GND) detection can be switched off by

OFF_LCDR bit.

It is driven by logical-AND of SPI control bit for OUT20.

When Reset_L9779 signal or OUT_DIS bit is asserted OUT_LSc is switched off.

When an over current fault occurs, the driver switches off with faster slew rate in order to

reduce the power dissipation.

The turn on/off time is fixed. During turn-off the slope is fixed by external RC load.

Max Cload = 20 nF.

Table 23. LSc electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

OUT20

RDS-on LSc

Drain source resistance

Iload = 50 mA



IOUTlk

Output leakage current

Vpin = 13.5 V @hot

µA

TTurn-on_ LSb

Turn-on delay time

From command to 80%

VOUT; Load: 250 , 10 nF

µs

TTurn-off_ LSb

Turn-off delay time

From command to 30%

VOUT; Load: 250 , 10 nF

µs

Vcl

Output clamping voltage Iload = 50 mA

PWclampSP

Clamp single pulse ATE

test

3.5

PWclampRP

Clamp repetitive pulses

Reliability Test

Tc < 145 °C;

I_OUT_n < 0.03 A

0.5 Mio cycles

0.2

Reverse voltage

Body diode reverse

current voltage drop

I = -50 mA

-0.5

-1

-1.1

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