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NCP1200_06 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1200_06
Description  PWM Current−Mode Controller for Low−Power Universal Off−Line Supplies
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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 2 page
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NCP1200
http://onsemi.com
2
6.5 V @ 600 mA
D2
1N5819
C5
10
mF
+
C3
10
mF
400 V
+
EMI
Filter
Adj
FB
CS
GND
C2
470
mF/10 V
Rf
470
Drv
VCC
NC
HV
1
2
3
4
8
7
6
5
Universal Input
M1
MTD1N60E
D8
5 V1
+
Figure 1. Typical Application
Rsense
*
*Please refer to the application information section
PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Function
Description
1
Adj
Adjust the Skipping Peak Current
This pin lets you adjust the level at which the cycle skipping process takes
place.
2
FB
Sets the Peak Current Setpoint
By connecting an Optocoupler to this pin, the peak current setpoint is ad-
justed accordingly to the output power demand.
3
CS
Current Sense Input
This pin senses the primary current and routes it to the internal comparator
via an L.E.B.
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
No Connection
This un−connected pin ensures adequate creepage distance.
8
HV
Generates the VCC from the Line
Connected to the high−voltage rail, this pin injects a constant current into
the VCC bulk capacitor.




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