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NCP392D Datasheet(PDF) 8 Page - ON Semiconductor

Part # NCP392D
Description  Adjustable Front End Overvoltage Protection Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP392D Datasheet(HTML) 8 Page - ON Semiconductor

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NCP392D
www.onsemi.com
8
VIN
OVLO
VOUT
UVLO
High−Z
Figure 7. EN and ACOK Associated Timers
tSTART
tSTART2
tRISE
tOFF
ACOK
EN
tSTART
tRISE
tSTART2
ACOK Pin
The NCP392D version integrates a ACOK status
indicator. This is an open drain pin tied low when no fault is
present (no TSd, no under voltage, no over voltage).
When disabled, the ACOK feature is disabled too and the
output pin is in high impedance mode.
Thermal Shutdown Protection
In case of internal overheating, the integrated thermal
shutdown (TSD) protection allows to open the internal
MOSFET in order to instantaneously decrease the device
temperature.
Embedded hysteresis allows to reengage the MOSFET
when the junction temperature decreases.
If the fault event is still present, the temperature increases
again and engages the thermal shutdown one more time until
fault event disappeared.
PCB Recommendations
To limit internal power dissipation, PCB routing must be
carefully done to improve current capability.
The NCP392D is declined in a CSP package. So power
dissipation can be decreased on each pin connection but
main thermal area must be as large as possible around IN and
OUT pins. Taking into account and respectively, four IN and
OUT pins must be hardwired together on the PCB.
Maximum power dissipation can be calculated with the
following formula:
T
J * TA + R
qJA
P
d
(eq. 3)
TJ: junction temperature
TA: ambient temperature
RqJA: thermal resistance of the junction to air through the
case and board.
Pd: power dissipation = RDS(on) x I2
ESD Tests
The NCP392D fully supports the IEC61000−4−2, level 4
(Input pin, 1
mF mounted on board).
That means, in Air condition, Vin has a
±15 kV ESD
protected input. In Contact condition, Vin has
±8 kV ESD
protected input.
Please refer to Figure 8 to see the IEC 61000−4−2
electrostatic discharge waveform.


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