NCP1207
V
out
+
+
OVP and
Demag
NCP1207
1
2
3
4
8
7
6
5
*
GND
Universal Network
+
*Please refer to the application information section
Figure 1. Typical Application
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
3
FB
CS
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.
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
5
6
7
8
GND
Drv
The IC ground
Driving pulses
Supplies the IC
−
−
The driver’s output to an external MOSFET.
V
CC
This pin is connected to an external bulk capacitor of typically 10 mF.
This unconnected pin ensures adequate creepage distance.
Connected to the high−voltage rail, this pin injects a constant current into
NC
HV
High−voltage pin
the V bulk capacitor.
CC
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