L6370 Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
L6370 Datasheet PDF : 19 Pages
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Circuit description
L6370
3.1
Diagnostic truth table
Table 7. Diagnostic truth table
Diagnostic conditions
Input
Output Diag1
Diag2
Normal Operation
Open Load Condition (Io< Iold)
Short to VS
Short Circuit to Ground (IO = ISC) (1)
(pin ON-DELAY grounded)
Output DMOS Open
Overtemperature
L
L
H
H
H
H
H
H
L
L
H
H
H
H
L
H
L
H
L
H
H
H
L
H
H
X
H
H
L
L
H
H
L
L
H
H
H
L
L
H
L
L
H
L
H
L
H
L
Supply Undervoltage (VS< Vsth2)
L
L
L
L
H
L
L
L
1. A cold lamp filament, or a capacitive load may activate the current limiting circuit of the IPS, when the IPS
is initially turned on.
3.2
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.
3.3
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:
– Short Circuit versus ground. A current limiting circuit fixes at Isc = 3.2A (typical
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 Table 7
10/19
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