L9779WD datasheet(60/170 Pages) STMICROELECTRONICS

60 / 170 page

Functional description

L9779WD

60/170

DocID027452 Rev 5

6.9.3

LSc function OUT19, 20 (low current drivers)

Figure 35. LSc function OUT19, 20 (low current drivers)

LSc functionality description

LSc are 2 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.

They are driven via MicroSecond Channel.

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 24. LSc electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

OUT 19, 20

RDS-on LSc

Drain source resistance

Iload = 50 mA

Ω

IOUTlk

Output leakage current

Vpin = 13.5 V @hot

µA

TTurn-on_ LSb

Turn-on delay time

From command to 80%

VOUT; Load: 250 Ω, 10 nF

µs

TTurn-off_ LSb

Turn-off delay time

From command to 30%

VOUT; Load: 250 Ω, 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 current

Body diode reverse

current voltage drop

I = -50 mA

-0.5

-1

-1.1

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