L6370Q(2011) 데이터 시트보기 (PDF) - STMicroelectronics
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L6370Q Datasheet PDF : 16 Pages
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Circuit description
L6370Q
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
Supply undervoltage (VS< Vsth2)
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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 +1.4 V (typical value) and an hysteresis of 400 mV
(maximum value), to ensure high noise immunity.
3.3
Diagnostic logic
The operating conditions of the device are permanently monitored and the following
occurrences are signalled via the DIAG1/DIAG2 open-drain output pins:
● Short circuit versus ground. A current limiting circuit fixes at Isc = 3.2 A (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 3 mA (typical value).
● Output DMOS open according to the diagnostic truth Table 7.
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Doc ID 022313 Rev 1
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