NCP380, NCV380
http://onsemi.com
15
FUNCTIONAL DESCRIPTION
Overview
The NCP380 is a high side P channel MOSFET power
distribution switch designed to protect the input supply
voltage in case of heavy capacitive loads, short circuit or
over current. In addition, the high side MOSFET is turned
off during under voltage, thermal shutdown or reverse
voltage condition. Adjustable version allows the user to
program the current limit threshold using an external
resistor. Thanks to the soft start circuitry, NCP380 is able to
limit large current and voltage surges.
Overcurrent Protection
NCP380 switches into a constant current regulation mode
when the output current is above the I
OCP
threshold.
Depending on the load, the output voltage is decreased
accordingly.
?SPAN class="pst NCP380HMU21AATBG_2471029_4"> In case of hot plug with heavy capacitive load, the
output voltage is brought down to the capacitor voltage.
The NCP380 will limit the current to the I
OCP
threshold
value until the charge of the capacitor is completed.
Figure 22. Heavy capacitive load
V
OUT
I
OUT
Drop due to
Capacitor Charge
I
OCP
?SPAN class="pst NCP380HMU21AATBG_2471029_4"> In case of overload, the current is limited to the I
OCP
value and the voltage value is reduced according to the
load by the following relation:
V
OUT
+ R
LOAD
I
OCP
(eq. 1)
Figure 23. Overload
I
OUT
V
OUT
I
OCP
?R
LOAD
I
OCP
?SPAN class="pst NCP380HMU21AATBG_2471029_4"> In case of short circuit or huge load, the current is
limited to the I
OCP
value within T
DET
time until the
short condition is removed. If the output remains
shorted or tied to a very low voltage, the junction
temperature of the chip exceeds T
SDOCP
value and the
device enters in thermal shutdown (MOSFET is
turned-off).
Figure 24. Short circuit
V
OUT
Thermal
Regulation
Threshold
Timer
Regulation
Mode
I
OUT
I
OCP
T
OCP
T
REG
Then, the device enters in timer regulation mode, described
in 2 phases:
?SPAN class="pst NCP380HMU21AATBG_2471029_4"> Off-phase: Power MOSFET is off during T
OCP
to allow
the die temperature to drop.
?SPAN class="pst NCP380HMU21AATBG_2471029_4"> On-phase: regulation current mode during T
REG.
The
current is regulated to the I
OCP
level.
The timer regulation mode allows the device to handle
high thermal dissipation (in case of short circuit for
example) within temperature operating condition.
NCP380 stays in on-phase/off-phase loop until the over
current condition is removed or enable pin is toggled.
Remark: Other regulation modes can be available for
different applications. Please contact our
ON Semiconductor representative for availability.
FLAG
Indicator
The FLAG
pin is an open-drain MOSFET asserted low
during over current, reverse-voltage or over temperature
conditions. When an over current or a reverse voltage fault
is detected on the power path, FLAG
pin is asserted low at
the end of the associate deglitch time (see electrical
characteristics). Thanks to this feature, the FLAG
pin is not
tied low during the charge of a heavy capacitive load or a
voltage transient on output. Deglitch time is T
FOCP
for over
current fault and T
REV
for reverse voltage. The FLAG
pin
remains low until the fault is removed. Then, the FLAG
pin
goes high at the end of T
FGL
.
Undervoltage Lock-out
Thanks to a built-in under voltage lockout (UVLO)
circuitry, the output remains disconnected from input until
V
IN
voltage is below V
UVLO
. When V
IN
voltage is above
V
UVLO
, the system try to reconnect the output after a
rearming time. T
RUVLO
. This circuit has a V
HYST
hysteresis
witch provides noise immunity to transient.
Thermal Sense
Thermal shutdown turns off the power MOSFET if the die
temperature exceeds T
SD
. A Hysteresis prevents the part
from turning on until the die temperature cools at T
RSD.
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