ViewSonic VA2016W - 20" LCD Monitor Service Manual page 42

6.5 IC802 (NCP1203)
Pin No. Pin name
1 Adj
2 FB
3 CS
4 Gnd
5 Drv
6 Vcc
7 Nc
8 HV
ViewSonic Corporation
Function
Adjust he skipping peak
current
Sets the peak current
setpoint
current sense input
The IC ground
Driving pulses
Supplies the IC
Ensure a clean and
lossless start-up
sequence
Pin Description
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.
By connecting an optocoupler to this pin,the pead
current setpoints is adjusted accordingly to the
ouput power demand.Skip cycle occurs when FB
falls below Vpin1.
This pin senses the primary current and routes it to
the internal comparator via and L.E.B.
The driver's output to an external MOSFET.
This pin is connected to an External bulk capacitor
This unconnected pin ensures adepuate creepage
distance.
Connected to the high-voltage rail, this pin injects a
constant current into the Vcc capacitor during the
start-up sequence
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VA2016w-2