L6375D STMicroelectronics, L6375D Datasheet - Page 9

• Manufacturer Part Number: L6375D
• Description: IC IPS 0.5A IND 20-SOIC
• Manufacturer: STMicroelectronics
• Type: High Sider

Specifications of L6375D

• Input Type: Non-Inverting
• Number Of Outputs: 1
• Current - Output / Channel: 500mA
• Current - Peak Output: 1.1A
• Voltage - Supply: 8 V ~ 52 V
• Operating Temperature: -25°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• On-state Resistance: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6375D
2.8
Overcurrent operation
In order to implement a short circuit protection the output power MOS is driven in linear
mode to limit the output current to the I
to the Isc value) lasts for a Ton time interval, that can be set by means of a capacitor (C
connected to the ON DELAY pin according to the following formula:
T
for
50 pF< C
After the T
interval with:
T
When also the Toff interval has expired, the out-put power MOS is switched ON. At this point
in time two conditions 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 protection can be disabled (keeping Ton = 0 but with the output current still
limited to Isc, and diagnostic disabled) simply shorting to ground the ON DELAY pin.
Figure 4.
on
off
= 1.28 μsec/ pF
= 64 ·T
a)
b)
don
The overload is still present, and then the output power MOS is again driven in
linear mode (limiting the output current to I
cycle, or
the over load the overload condition is removed, and the output power MOS is no
longer driven in linear mode. All these occurrences are presented on the DIAG2
pin (see fig 2).
on
on
.
< 2 nF
interval has expired the output power MOS is switched off for the T
Non dissipative short circuit protection operation
Doc ID 13678 Rev 2
sc
(1.1A typical value). This condition (current limited
SC
) for another T
Electrical specifications
ON
, starting a new
off
time
don
9/16
)