L6376D STMicroelectronics, L6376D Datasheet - Page 11

• Manufacturer Part Number: L6376D
• Description: IC IPS QUAD 0.5A 20-POWERSOIC
• Manufacturer: STMicroelectronics
• Type: High Sider

Specifications of L6376D

• Input Type: Non-Inverting
• Number Of Outputs: 4
• Current - Output / Channel: 500mA
• Current - Peak Output: 900mA
• Voltage - Supply: 9.5 V ~ 35 V
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-20 Exposed Bottom Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• On-state Resistance: -

L6376
8
Short circuit operation
In order to allow normal operation of the other inputs when one channel is in short cirtuit, an
innovative non dissipative over current protection (patent pending) is implemented in the
device.
In this way, the temperature of the device is kept enough low to prevent the intervention of
the thermal protection (in most of the cases) and so to avoid the shut down of the whole
device.
If a short circuit condition is present on one output, the current limiting circuit puts that
channel in linear mode — sourcing the ISC current (typically 800 mA) — for a time period
(t
After that period, if the short circuit condition is still present the output is turned off for
another time period (t
OFF DELAY pin).
When also this period is expired:
●
●
The t
using external capacitors ranging from 50 pF to 15 nF (1.28 µs/pF).
If the OFF DELAY pin is tied to ground (i.e. the C
period is 64 times the t
The diagnostic output (DIAG) is active when the output is switched off, while it is not active
when the output is on (i.e. during the t
condition is present.
Figure 5.
ON
) defined by an external capacitor (C
(active low)
CURRENT
if the short circuit condition is still present the output stays on for the tON period and the
sequence starts again;
if the short circuit condition is not present anymore the normal operation of the output is
resumed.
OUTPUT
ON
DIAG
I out
I sc
and t
Short circuit operation waveforms
OFF
periods are completely independent and can be set from 64 µs to 15 µs,
Short Circuit
OFF
ON
t<t
ON
) defined by a second external capacitor (C
period.
ON
t
ON
DON
period) even if in that period a short circuit
connected to the ON DELAY pin).
t
OFF
Short Circuit
DOFF
capacitor is not used) the t
t
ON
t
OFF
D94IN105
Short circuit operation
DOFF
connected to the
OFF
Time
Time
time
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