NCP391_14 datasheet(9/14 Pages) ONSEMI

Part #	NCP391

Description	Positive Overvoltage Protection Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP391

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9

VOLTAGE DETECTION

IN

OUT

CONDITIONS

VIN > OVLO

0 < VIN < UVLO

And/Or

/EN = 1

VOLTAGE DETECTION

IN

OUT

CONDITIONS

/EN = 0

&

UVLO < VIN < OVLO

Figure 16. Simplified Diagram

Figure 17. Simplified Diagram

Operation

The NCP391 provides overvoltage protection for

positive voltage, up to 28 V. A low RDS(on) NMOSFET

protects the systems (i.e.: charger) connected on the Vout

pin, against positive overvoltage. At powerup, with EN pin

= low, the output is rising up ton soft−start after the input

overtaking undervoltage UVLO (Figure 3). The NCP391

provides a FLAG output, which alerts the system that a fault

has occurred. A tstart additional delay, regarding available

output (Figure 3) is added between output signal rising up

and to FLAG signal rising up. FLAG pin is an open drain

output.

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