L6370 STMicroelectronics, L6370 Datasheet - Page 10

• Manufacturer Part Number: L6370
• Description: 2.5a High-side Driver Industrial Intelligent Power Switch
• Manufacturer: STMicroelectronics

Circuit description
3.1
3.2
3.3
10/19
Diagnostic truth table
Table 7.
1. A cold lamp filament, or a capacitive load may activate the current limiting circuit of the IPS, when the IPS
Input section
The input section is an high impedance differential stage with high common and differential
mode range. There’s built-in offset of +1.4V (typical value) and an hysteresis of 400mV
(maximum value), to ensure high noise immunity.
Diagnostic logic
The operating conditions of the device are permanently monitored and the following
occurences are signalled via the DIAG1/DIAG2 open-drain output pins:
Normal Operation
Open Load Condition (I
Short to V
Short Circuit to Ground (I
(pin ON-DELAY grounded)
Output DMOS Open
Overtemperature
Supply Undervoltage (V
is initially turned on.
–
–
–
–
–
–
Short Circuit versus ground. A current limiting circuit fixes at I
value) the maximum current that can be sourced from the OUTPUT pin (for more
details see short circuit operation section).
Short Circuit versus Vs.
Under Voltage(UV)
Over Temperature (OVT)
Open Load, if the output current is less than 3mA (typical value).
Output DMOS Open according to the diagnostic Truth
S
Diagnostic truth table
Diagnostic conditions
o
S
< I
< V
O
old
= I
sth2
)
SC
)
)
(1)
Input
H
H
H
H
H
H
H
L
L
L
L
L
L
L
Output
H
H
H
H
X
L
L
L
L
L
L
L
L
L
Table 7
sc
Diag1
= 3.2A (typical
H
H
H
H
H
H
H
H
L
L
L
L
L
L
Diag2
L6370
H
H
H
H
H
H
H
H
H
H
L
L
L
L