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NUS1204MN
Schottky
AC/DC Adapter of
SOURCE
DRAIN
Diode
Accessory Charger
P?CH
IN
GATE
+
PIN FUNCTION DESCRIPTIONS
+
?
V ref
GND
Figure 1. Simplified Schematic
OUT
C1
LOAD
Pin #
1
2
3, 7
4
5
6, 8
Symbol
GATE
OUT
GND
IN
SOURCE
DRAIN
Pin Description
Gate pin of the P?Channel Power MOSFET
This signal drives the gate of a P?channel Power MOSFET. It is controlled by the voltage level on the IN pin.
When an overvoltage event is detected, the OUT pin is driven to within 1.0 V of V IN in less than 20 m sec
provided that gate and stray capacitance is less than 12 nF.
Circuit Ground
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 IN , thus disconnecting the P?Channel Power MOSFET.
The nominal threshold level is 4.725 V and this threshold level can be increased with the addition of an external
resistor between the IN pin and the adapter.
Source pin of the P?Channel Power MOSFET
Drain pin of the P?Channel Power MOSFET
OVERVOLTAGE PROTECTION CIRCUIT TRUTH TABLE
IN
<V th
>V th
OUT
GND
V IN
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