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參數(shù)資料
| 型號： | NCP346SN2T1G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | Overvoltage Protection IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | LEAD FREE, TSOT-23, 5 PIN |
| 文件頁數(shù)： | 2/15頁 |
| 文件大小： | 386K |
| 代理商： | NCP346SN2T1G |
NCP346
http://onsemi.com
2
Figure 2. Detailed Block Diagram
+
COMP
CNTRL
(3)
OUT
(1)
GND
(2)
LOGIC
BLOCK
DRIVER
Pre
regulator
V
CC
(5)
IN
(4)
ON/OFF
OUT
V5
R1
R2
Bandgap
Reference
V
CC
V
CC
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 V
CC
in less
than 1.0 sec 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 V
CC
which disconnects the FET. The input is tied Low via an
internal 50 k 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 (V
th
),
the OUT pin will be driven to within 1.0 V of V
CC
, thus disconnecting the FET. The nominal threshold level can be
increased with the addition of an external resistor divider between IN, V
CC
, and GND.
5
V
CC
Positive Voltage supply. OUT is guaranteed to be in low state (MOSFET ON) as long as V
CC
remains above
2.5 V, and below the overvoltage threshold.
TRUTH TABLE
IN
CNTRL
OUT
<V
th
L
GND
<V
th
H
V
CC
>V
th
L
V
CC
>V
th
H
V
CC
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