L9779WD-SPI Datasheet, PDF (55/141 Pages) STMicroelectronics – Smart reset function

L9779WD-SPI
Functional description
6.8.3
LSc function OUT20 (low current drivers)
Figure 35. LSc function OUT20 (low current drivers)
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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.
Pin
OUT20
Symbol
Table 23. LSc electrical characteristics
Parameter
Test condition
Min Typ Max Unit
R_{DS-on LSc} Drain source resistance Iload = 50 mA
-
- 20 
IOUT_lk
Output leakage current Vpin = 13.5 V @hot
-
- 10 µA
T_{Turn-on_ LSb} Turn-on delay time
From command to 80%
V_OUT; Load: 250 , 10 nF
-
-
5
µs
T_{Turn-off_ LSb} Turn-off delay time
From command to 30%
V_OUT; Load: 250 , 10 nF
-
-
5
µs
V_cl
Output clamping voltage I_load = 50 mA
40 45 50 V
PW_clampSP
Clamp single pulse ATE
test
-
-
- 3.5 mJ
PW_clampRP
Clamp repetitive pulses
Reliability Test
Tc < 145 °C;
I_OUT_n < 0.03 A
0.5 Mio cycles
-
- 0.2 mJ
Reverse voltage
Body diode reverse
current voltage drop
I = -50 mA
-0.5 -1 -1.1 V
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