NCP346 datasheet(2/15 Pages) ONSEMI

Part #	NCP346

Description	Overvoltage Protection IC

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NCP346

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2

Figure 2. Detailed Block Diagram

−

+

CNTRL

(3)

OUT

(1)

GND

(2)

LOGIC

BLOCK

DRIVER

Pre−regulator

VCC

(5)

IN

(4)

ON/OFF

OUT

V5

R1

R2

COMP

Bandgap

Reference

VCC

PIN FUNCTION DESCRIPTIONS

Pin #

Symbol

Pin Description

1

OUT

This signal drives the gate of a P−channel MOSFET. It is controlled by the voltage level on IN or the logic state of

the CNTRL input. When an overvoltage event is detected, the OUT pin is driven to within 1.0 V of VCC in less

than 1.0

msec provided that gate and stray capacitance is less than 12 nF.

2

GND

Circuit Ground

3

CNTRL

This logic signal is used to control the state of OUT and turn−on/off the P−channel MOSFET. A logic High results

in the OUT signal being driven to within 1.0 V of VCC which disconnects the FET. The input is tied Low via an

internal 50 k

W pull−down resistor. It is recommended that the input be connected to GND if it is not used.

4

IN

This pin senses an external voltage point. If the voltage on this input rises above the overvoltage threshold (Vth),

the OUT pin will be driven to within 1.0 V of VCC, thus disconnecting the FET. The nominal threshold level can be

increased with the addition of an external resistor divider between IN, VCC, and GND.

5

VCC

Positive Voltage supply. OUT is guaranteed to be in low state (MOSFET ON) as long as VCC remains above

2.5 V, and below the overvoltage threshold.

TRUTH TABLE

IN

CNTRL

OUT

<Vth

L

GND

<Vth

H

VCC

>Vth

L

VCC

>Vth

H

VCC

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