L9386_08 STMICROELECTRONICS [STMicroelectronics], L9386_08 Datasheet - Page 10

• Manufacturer Part Number: L9386_08
• Description: Dual intelligent power low side switch
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Electrical specifications
2.4
10/14
Circuit description
The L9386 is a dual low side driver for inductive loads like valves in automotive environment.
The device is enabled by a common CMOS compatible ENABLE high signal. The internal
pull down current sources at the ENABLE and INPUT pins protect the device in open input
conditions against malfunctions. An output slope limitation for du/dt is implemented to
reduce the EMI. An integrated active flyback voltage limitation clamps the output voltage
during the flyback phase to 50V.
Each driver is protected against short circuit and thermal overload. In short circuit condition
the output will be disabled after a short delay time t
latched until a negative slope occur at the correspondent input pin. The thermal disable for
T
below the disable threshold temperature.
For the real time error diagnosis the voltage and the current of the outputs are compared
with internal fixed values V
(R
extended supply voltage range of 4.5 V ≤ V
Also the output voltages VO
fixed offset of ΔVO
during the flyback phases of the compared output, the ΔVO diagnostic
includes a latch function. Reaching the flyback clamping voltage VO
is resetted by a latch. To activate again this kind of diagnostic a low signal at the
correspondent INPUT or the ENABLE pin must occur (see also
The diagnostic output level in connection with different ENABLE and INPUT conditions
allows to recognize different fail states, like overtemperature, short to VSS, short to GND,
bypass to GND and disconnected load (see also
The diagnostic output is also protected against short to UD
current threshold IO
overload delay switch-off time t
J
L
> 175 °C of the output will be resetted if the junction temperature decreases about 20 °C
≥ 20 kΩ, R
L
> 38Ω) in ON and OFF conditions. The diagnostic operates also in the
UV 1,2
o
, the output current will be limited internally during the diagnostic
to recognize GND bypasses. To suppress mail ΔVO diagnoses
OUV
1,2
DOL
are compared against each other in OFF condition with a
for OFF and I
.
S
OUC
≤ 32 V.
Table 5 on page
for ON conditions to recognize open load
DOL
to suppress spikes. This disable is
max
. Oversteping the over load
Figure
6).
C
the diagnostic signal
5).
L9386