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NCP1207A_06 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1207A_06
Description  PWM Current−Mode Controller for Free Running Quasi−Resonant Operation
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1207A
http://onsemi.com
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Universal Network
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Figure 1. Typical Application
*Please refer to the application information section
OVP and
Demag
NCP1207A
*
Vout
GND
PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
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, device shuts off.
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.




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