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NCP1377 Datasheet(PDF) 2 Page - ON Semiconductor

No. de pieza NCP1377
Descripción Electrónicos  PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
Download  16 Pages
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1377 Datasheet(HTML) 2 Page - ON Semiconductor

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NCP1377, NCP1377B
http://onsemi.com
2
Figure 1. Typical Application Schematic
1
8
2
3
4
6
5
7
NCP1377
OVP and
Demag
+
Universal
Network
R*
+
12 V @ 1 A
GND
+
Y1 Type
*Please refer to the application information section.
PIN FUNCTION DESCRIPTION
Pin
Symbol
Function
Description
1
Demag
Core reset detection and OVP
The auxiliary FLYBACK signal ensures discontinuous operation and offers a fixed
overvoltage detection level of 7.2 V.
2
FB
Sets the peak current setpoint
By connecting an optocoupler to this pin, the peak current setpoint is adjusted
accordingly to the output power demand. By bringing this pin below the internal
skip level, you shut off the device.
3
CS
Current sense input and skip
cycle level selection
This pin senses the primary current and routes it to the internal comparator via an
L.E.B. By inserting a resistor in series with the pin, you control the level at which
the skip operation takes place.
4
GND
The IC ground
5
Drv
Driving pulses
The driver’s output to an external MOSFET.
6
VCC
Supplies the IC
This pin is connected to an external bulk capacitor of typically 10 mF.
7
NC
This unconnected pin ensures adequate creepage distance.
8
HV
High−voltage pin
Connected to the high−voltage rail, this pin injects a constant current into the VCC
bulk capacitor and ensures a clean lossless startup sequence.


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