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Fabricante

NCP391
(Rev.:2011)

Positive Overvoltage Protection Controller with Internal Low RON NMOS FET

ON Semiconductor 

NCP391

CONDITIONS

IN

OUT

VIN > OVLO

0 < VIN < UVLO

And/Or

VOLTAGE DETECTION

/EN = 1

Figure 16. Simplified Diagram

CONDITIONS

IN

OUT

/EN = 0

&

VOLTAGE DETECTION

UVLO < VIN < OVLO

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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