L9349 STMicroelectronics, L9349 Datasheet - Page 6

• Manufacturer Part Number: L9349
• Description: Quad Intelligent Power Low Side Switch
• Manufacturer: STMicroelectronics

L9349
DIAGNOSTIC TABLE
CIRCUIT DESCRIPTION
The L9349 is a quad low side driver for inductive loads like valves in automotive environment. The internal pull
down current sources at the ENable and INput pins assure in case of open input conditions that the device is
switched off. An output voltage 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 50 V.
Each driver is protected against short circuit at V
output will be disabled after a short delay time t
reset if the junction temperature decreases about 20°C below the disable threshold temperature.
The overtemperature, overload and groundloss information is stored until IN is low.
For the real time error diagnosis the voltage and the current of the outputs are compared with internal fixed val-
ues V
conditions.
Also the output voltages V
to recognize load bypasses. The V
output. The outputs 1 and 4 are compared for V
The diagnostic output level in connection with different ENable and INput conditions allows to recognize differ-
ent fail states, like overtemp, short to V
table).
The diagnostic output is protected against short circuit. Exceeding the over load current threshold I
put current will be limited internally during the diagnostic overload delay switch-off time t
The device complies the I
tionality. Therefore some diagnostic functions are internal filtered. The following table shows the corresponding
filter time for each detected signal.
6/12
SGND or PGND loss
SGND or PGND loss
OUV
Load bypass
Open Load
GND short
Over Load
for OFF and I
T
jtyp
190°C Overtemperature
Normal Function
OUC
Conditions
SO
O1- 4
pulses imposed to the supply voltage of the valves without any failures of the func-
for ON conditions to recognize open load (R
are compared to each other output in OFF condition with a fixed offset of V
I
O1,2,3,4typ
OUV
V
V
I
I
O1-4/2-3
Otyp
S
Omin 1,2
Omin 3,4
channel off
channel on
, short to GND, bypass to GND and disconnected load (see diagnostic
diagnoses is suppressed during the flyback phases of the compared
< 0.55VS
< 320mA
> 5A
> 3A
1.25V
DOL
OUT
OUV
. The thermal disable for T
< 32V and thermal overload. In short circuit condition the
and also outputs 2 and 3 are compared.
EN
H
H
H
H
H
H
X
X
L
L
L
20K , R
IN
X
H
X
H
X
H
H
L
L
L
J
> 180°C of the output will be
L
> 38 ) in OFF and ON
DOL
OUT
off
off
on
off
off
on
off
off
off
off
.
OOC
DIAG.
, the out-
H
H
H
H
L
L
L
L
L
L
OUV