NCP380HSN10AGEVB ON Semiconductor, NCP380HSN10AGEVB Datasheet - Page 15

• Manufacturer Part Number: NCP380HSN10AGEVB
• Description: Power Management IC Development Tools NCP380 EVAL BOARD
• Manufacturer: ON Semiconductor
• Type: Power Driversr

Specifications of NCP380HSN10AGEVB

• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: NCP380
• Output Current: 10 A

Overview
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
when the output current is above the I
Depending on the load, the output voltage is decreased
accordingly.



The NCP380 is a high side P channel MOSFET power
NCP380 switches into a constant current regulation mode
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
value until the charge of the capacitor is completed.
In case of overload, the current is limited to the I
value and the voltage value is reduced according to the
load by the following relation:
In case of short circuit or huge load, the current is
limited to the I
short condition is removed. If the output remains
shorted or tied to a very low voltage, the junction
temperature of the chip exceeds T
device enters in thermal shutdown (MOSFET is
turned-off).
I
V
I
V
I
OCP
OUT
OUT
OUT
OUT
Figure 22. Heavy capacitive load
OCP
V
Figure 23. Overload
OUT
value within T
+ R
I
OCP
LOAD
I
OCP
Drop due to
Capacitor Charge
 R
I
DET
SDOCP
OCP
LOAD
time until the
OCP
value and the
FUNCTIONAL DESCRIPTION
OCP
threshold.
threshold
OCP
http://onsemi.com
(eq. 1)
15
Then, the device enters in timer regulation mode, described
in 2 phases:


high thermal dissipation (in case of short circuit for
example) within temperature operating condition.
current condition is removed or enable pin is toggled.
Remark: Other regulation modes can be available for
different
ON Semiconductor representative for availability.
FLAG Indicator
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
current fault and T
remains low until the fault is removed. Then, the FLAG pin
goes high at the end of T
Undervoltage Lock-out
circuitry, the output remains disconnected from input until
V
V
rearming time. T
witch provides noise immunity to transient.
Thermal Sense
temperature exceeds T
from turning on until the die temperature cools at T
IN
UVLO
The timer regulation mode allows the device to handle
NCP380 stays in on-phase/off-phase loop until the over
The FLAG pin is an open-drain MOSFET asserted low
Thanks to a built-in under voltage lockout (UVLO)
Thermal shutdown turns off the power MOSFET if the die
Off-phase: Power MOSFET is off during T
the die temperature to drop.
On-phase: regulation current mode during T
current is regulated to the I
V
I
OUT
OUT
voltage is below V
, the system try to reconnect the output after a
applications.
RUVLO
Figure 24. Short circuit
Regulation
Threshold
REV
Thermal
I
OCP
SD
. This circuit has a V
for reverse voltage. The FLAG pin
UVLO
FGL
. A Hysteresis prevents the part
.
OCP
. When V
T
OCP
Please
level.
T
IN
REG
Regulation
voltage is above
Timer
Mode
contact
HYST
FOCP
OCP
REG.
hysteresis
to allow
for over
RSD.
The
our