l6375 STMicroelectronics, l6375 Datasheet - Page 7

• Manufacturer Part Number: l6375
• Description: 0.5a Industrial Intelligent Power Switch
• Manufacturer: STMicroelectronics

ditions may occur
We call this unique feature Non Dissipative Short Circuit Protection and it ensures a very safe operation even
in permanent overload conditions. Note that choosing the most appropriate value for the Ton interval (i.e. the
value of the Cdon capacitor) a delay (the Ton itself) will prevent that a misleading Short Circuit information is
presented on the DIAG2 output, when driving capacitive loads (that acts like short circuit in the very beginning)
or Incandescent Lamp (a cold filament has a very low resistive value). The Non Dissipative Short Circuit Pro-
tection can be disabled (keeping Ton = 0 but with the output current still limited to Isc, and Diagnostic dis-
abled)simply shorting to ground the the ON DELAY pin.
Figure 2. Non Dissipative Short Circuit Protection Operation
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 see: diagnostic Truth Table.
- Short Circuit versus ground.
- Short Circuit versus V
- Under Voltage(UV)
- Over Temperature (OVT)
- Open Load, if the output current is less than 3mA (typical value).
DEMAGNETIZATION OF INDUCTIVE LOADS
An internal zener diode, limiting the voltage across the Power MOS to between 50 and 60V (V
and fast demagnetization of inductive loads without external clamping devices. The maximum energy that can
be absorbed from an inductive load is specified as 200mJ (at T
A) the overload is still present, and then the output power MOS is again driven in linear mode (limiting
B) the overload condition is removed, and the output power MOS is no longer driven in linear mode.
(active low)
the output current to Isc) for another Ton, starting a new cycle, or
All these occurrences are presented on the DIAG2 pin (see fig 2).
CURRENT
OUTPUT
DIAG
I out
I sc
S
.
Short Circuit
t<t
ON
t
ON
t
OFF
Short Circuit
j
= 85 C)
t
ON
t
OFF
D94IN105
cl
Time
Time
), provides safe
L6375
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