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NCP1203D100R2G Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1203D100R2G
Description  PWM Current−Mode Controller for Universal Off−Line Supplies Featuring Standby and Short Circuit Protection
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1203D100R2G Datasheet(HTML) 2 Page - ON Semiconductor

 
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NCP1203
http://onsemi.com
2
Figure 1. Typical Application Example
EMI
FILTER
UNIVERSAL
INPUT
+
+
NCP1203
+
VOUT
Aux.
Adj
FB
CS
GND
HV
VCC
Drv
1
2
3
4
8
7
6
5
*
*Please refer to the application information section
PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Function
Pin Description
1
Adj
Adjust the skipping peak current
This pin lets you adjust the level at which the cycle skipping process takes
place. Shorting this pin to ground, permanently disables the skip cycle
feature.
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. Skip cycle occurs when
FB falls below Vpin1.
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 22
mF.
7
NC
This unconnected pin ensures adequate creepage distance.
8
HV
Ensure a clean and lossless
startup sequence
Connected to the high−voltage rail, this pin injects a constant current into
the VCC capacitor during the startup sequence.


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