NCP345EVB ON Semiconductor, NCP345EVB Datasheet - Page 2

• Manufacturer Part Number: NCP345EVB
• Description: EVAL BOARD FOR NCP345
• Manufacturer: ON Semiconductor

Specifications of NCP345EVB

• Design Resources: NCP345 Demo Board BOM NCP345EVB Gerber Files NCP345/6 EVB Schematic
• Main Purpose: Overvoltage Protection
• Embedded: No
• Utilized Ic / Part: NCP345
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: NCP345
• Other names: NCP345EVBOS

PIN FUNCTION DESCRIPTIONS
TRUTH TABLE
CNTRL
Pin #
1
2
3
4
5
(4)
IN
(3)
<V
<V
>V
>V
IN
th
th
th
th
Symbol
CNTRL
GND
OUT
V
IN
R1
R2
CC
Reference
Bandgap
regulator
Pre−
V
CC
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 V
less than 1.0 msec provided that gate and stray capacitance is less than 12 nF.
Circuit Ground
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 V
the input should be connected to ground.
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 V
level is 6.85 V and this threshold level can be increased with the addition of an external resistor between IN
and V
Positive Voltage supply. If V
disconnecting the P−channel FET.
CNTRL
V5
H
H
L
L
CC
.
+
−
COMP
Figure 2. Detailed Block Diagram
GND
OUT
V
V
V
CC
CC
CC
CC
http://onsemi.com
falls below 2.8 V (nom), the OUT pin will be driven to within 1.0 V of V
NCP345
R3
R4
2
V
(5)
GND
(2)
CC
Pin Description
+
−
UVLO
CC
, thus disconnecting the FET. The nominal threshold
CC
which disconnects the FET. If this pin is not used,
BLOCK
LOGIC
ON/OFF
DRIVER
V
CC
OUT
CC
CC
, thus
OUT
(1)
in